VB.Net Tutorial/GUI/RichTextBox — различия между версиями

Текущая версия на 12:56, 26 мая 2010

Содержание

1 Change RichTextBox Selection color
2 Change RichTextBox Selection Font
3 Copy and paste between RichTextBox
4 Find text in RichTextBox
5 Load txt file to RichTextBox
6 Print view text in RichTextBox
7 RichTextBox Redo/Undo
8 Save Rtf file from RichTextBox and Read Rtf file to RichTextBox
9 Save text in RichTextBox into a file
10 Simple Editor based on RichTextBox

Change RichTextBox Selection color

Option Strict On
Imports System.IO
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RichTextBoxSelectionColor
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    Friend WithEvents ColorDialog1 As System.Windows.Forms.ColorDialog
    Friend WithEvents FontDialog1 As System.Windows.Forms.FontDialog
    Friend WithEvents SaveFileDialog1 As System.Windows.Forms.SaveFileDialog
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents btnChangeColor As System.Windows.Forms.Button
    Friend WithEvents btnChangeFont As System.Windows.Forms.Button
    Friend WithEvents btnSaveRTF As System.Windows.Forms.Button
    Friend WithEvents btnOpenRTF As System.Windows.Forms.Button
    Friend WithEvents btnWriteControls As System.Windows.Forms.Button
    Friend WithEvents btnReadControls As System.Windows.Forms.Button
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Panel1 = New System.Windows.Forms.Panel()
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox()
        Me.ColorDialog1 = New System.Windows.Forms.ColorDialog()
        Me.FontDialog1 = New System.Windows.Forms.FontDialog()
        Me.SaveFileDialog1 = New System.Windows.Forms.SaveFileDialog()
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog()
        Me.btnChangeColor = New System.Windows.Forms.Button()
        Me.btnChangeFont = New System.Windows.Forms.Button()
        Me.btnSaveRTF = New System.Windows.Forms.Button()
        Me.btnOpenRTF = New System.Windows.Forms.Button()
        Me.btnWriteControls = New System.Windows.Forms.Button()
        Me.btnReadControls = New System.Windows.Forms.Button()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.TextBox2 = New System.Windows.Forms.TextBox()
        Me.TextBox3 = New System.Windows.Forms.TextBox()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        "
        "Panel1
        "
        Me.Panel1.Controls.AddRange(New System.Windows.Forms.Control() {Me.btnReadControls, Me.btnWriteControls, Me.btnOpenRTF, Me.btnSaveRTF, Me.btnChangeFont, Me.btnChangeColor})
        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Bottom
        Me.Panel1.Location = New System.Drawing.Point(0, 222)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(656, 64)
        Me.Panel1.TabIndex = 0
        "
        "RichTextBox1
        "
        Me.RichTextBox1.Location = New System.Drawing.Point(16, 8)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(336, 176)
        Me.RichTextBox1.TabIndex = 1
        Me.RichTextBox1.Text = "Mr. and Mrs. Dursley, of number four, Privet Drive, were proud to say that they w" & _
        "ere perfectly normal, thank you very much."
        "
        "btnChangeColor
        "
        Me.btnChangeColor.Location = New System.Drawing.Point(24, 24)
        Me.btnChangeColor.Name = "btnChangeColor"
        Me.btnChangeColor.Size = New System.Drawing.Size(88, 32)
        Me.btnChangeColor.TabIndex = 0
        Me.btnChangeColor.Text = "Change Color"
        "
        "btnChangeFont
        "
        Me.btnChangeFont.Location = New System.Drawing.Point(128, 24)
        Me.btnChangeFont.Name = "btnChangeFont"
        Me.btnChangeFont.Size = New System.Drawing.Size(88, 32)
        Me.btnChangeFont.TabIndex = 1
        Me.btnChangeFont.Text = "Change Font"
        "
        "btnSaveRTF
        "
        Me.btnSaveRTF.Location = New System.Drawing.Point(232, 24)
        Me.btnSaveRTF.Name = "btnSaveRTF"
        Me.btnSaveRTF.Size = New System.Drawing.Size(88, 32)
        Me.btnSaveRTF.TabIndex = 2
        Me.btnSaveRTF.Text = "Save RTF"
        "
        "btnOpenRTF
        "
        Me.btnOpenRTF.Location = New System.Drawing.Point(336, 24)
        Me.btnOpenRTF.Name = "btnOpenRTF"
        Me.btnOpenRTF.Size = New System.Drawing.Size(88, 32)
        Me.btnOpenRTF.TabIndex = 3
        Me.btnOpenRTF.Text = "Open RTF"
        "
        "btnWriteControls
        "
        Me.btnWriteControls.Location = New System.Drawing.Point(440, 24)
        Me.btnWriteControls.Name = "btnWriteControls"
        Me.btnWriteControls.Size = New System.Drawing.Size(88, 32)
        Me.btnWriteControls.TabIndex = 4
        Me.btnWriteControls.Text = "Write Controls"
        "
        "btnReadControls
        "
        Me.btnReadControls.Location = New System.Drawing.Point(544, 24)
        Me.btnReadControls.Name = "btnReadControls"
        Me.btnReadControls.Size = New System.Drawing.Size(88, 32)
        Me.btnReadControls.TabIndex = 5
        Me.btnReadControls.Text = "Read Controls"
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(400, 24)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(232, 20)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = "TextBox1"
        "
        "TextBox2
        "
        Me.TextBox2.Location = New System.Drawing.Point(400, 68)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.Size = New System.Drawing.Size(232, 20)
        Me.TextBox2.TabIndex = 3
        Me.TextBox2.Text = "TextBox2"
        "
        "TextBox3
        "
        Me.TextBox3.Location = New System.Drawing.Point(400, 112)
        Me.TextBox3.Name = "TextBox3"
        Me.TextBox3.Size = New System.Drawing.Size(232, 20)
        Me.TextBox3.TabIndex = 4
        Me.TextBox3.Text = "TextBox3"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(656, 286)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox3, Me.TextBox2, Me.TextBox1, Me.RichTextBox1, Me.Panel1})
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub btnChangeColor_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles btnChangeColor.Click
        Dim theColor As System.Drawing.Color
        ColorDialog1.AllowFullOpen = True
        ColorDialog1.AnyColor = True
        ColorDialog1.ShowDialog()
        theColor = ColorDialog1.Color
        btnChangeColor.ForeColor = theColor
        RichTextBox1.SelectionColor = theColor
    End Sub
End Class

Change RichTextBox Selection Font

Option Strict On
Imports System.IO
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RichTextBoxSelectionFont
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    Friend WithEvents ColorDialog1 As System.Windows.Forms.ColorDialog
    Friend WithEvents FontDialog1 As System.Windows.Forms.FontDialog
    Friend WithEvents SaveFileDialog1 As System.Windows.Forms.SaveFileDialog
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents btnChangeColor As System.Windows.Forms.Button
    Friend WithEvents btnChangeFont As System.Windows.Forms.Button
    Friend WithEvents btnSaveRTF As System.Windows.Forms.Button
    Friend WithEvents btnOpenRTF As System.Windows.Forms.Button
    Friend WithEvents btnWriteControls As System.Windows.Forms.Button
    Friend WithEvents btnReadControls As System.Windows.Forms.Button
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Panel1 = New System.Windows.Forms.Panel()
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox()
        Me.ColorDialog1 = New System.Windows.Forms.ColorDialog()
        Me.FontDialog1 = New System.Windows.Forms.FontDialog()
        Me.SaveFileDialog1 = New System.Windows.Forms.SaveFileDialog()
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog()
        Me.btnChangeColor = New System.Windows.Forms.Button()
        Me.btnChangeFont = New System.Windows.Forms.Button()
        Me.btnSaveRTF = New System.Windows.Forms.Button()
        Me.btnOpenRTF = New System.Windows.Forms.Button()
        Me.btnWriteControls = New System.Windows.Forms.Button()
        Me.btnReadControls = New System.Windows.Forms.Button()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.TextBox2 = New System.Windows.Forms.TextBox()
        Me.TextBox3 = New System.Windows.Forms.TextBox()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        "
        "Panel1
        "
        Me.Panel1.Controls.AddRange(New System.Windows.Forms.Control() {Me.btnReadControls, Me.btnWriteControls, Me.btnOpenRTF, Me.btnSaveRTF, Me.btnChangeFont, Me.btnChangeColor})
        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Bottom
        Me.Panel1.Location = New System.Drawing.Point(0, 222)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(656, 64)
        Me.Panel1.TabIndex = 0
        "
        "RichTextBox1
        "
        Me.RichTextBox1.Location = New System.Drawing.Point(16, 8)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(336, 176)
        Me.RichTextBox1.TabIndex = 1
        Me.RichTextBox1.Text = "Mr. and Mrs. Dursley, of number four, Privet Drive, were proud to say that they w" & _
        "ere perfectly normal, thank you very much."
        "
        "btnChangeColor
        "
        Me.btnChangeColor.Location = New System.Drawing.Point(24, 24)
        Me.btnChangeColor.Name = "btnChangeColor"
        Me.btnChangeColor.Size = New System.Drawing.Size(88, 32)
        Me.btnChangeColor.TabIndex = 0
        Me.btnChangeColor.Text = "Change Color"
        "
        "btnChangeFont
        "
        Me.btnChangeFont.Location = New System.Drawing.Point(128, 24)
        Me.btnChangeFont.Name = "btnChangeFont"
        Me.btnChangeFont.Size = New System.Drawing.Size(88, 32)
        Me.btnChangeFont.TabIndex = 1
        Me.btnChangeFont.Text = "Change Font"
        "
        "btnSaveRTF
        "
        Me.btnSaveRTF.Location = New System.Drawing.Point(232, 24)
        Me.btnSaveRTF.Name = "btnSaveRTF"
        Me.btnSaveRTF.Size = New System.Drawing.Size(88, 32)
        Me.btnSaveRTF.TabIndex = 2
        Me.btnSaveRTF.Text = "Save RTF"
        "
        "btnOpenRTF
        "
        Me.btnOpenRTF.Location = New System.Drawing.Point(336, 24)
        Me.btnOpenRTF.Name = "btnOpenRTF"
        Me.btnOpenRTF.Size = New System.Drawing.Size(88, 32)
        Me.btnOpenRTF.TabIndex = 3
        Me.btnOpenRTF.Text = "Open RTF"
        "
        "btnWriteControls
        "
        Me.btnWriteControls.Location = New System.Drawing.Point(440, 24)
        Me.btnWriteControls.Name = "btnWriteControls"
        Me.btnWriteControls.Size = New System.Drawing.Size(88, 32)
        Me.btnWriteControls.TabIndex = 4
        Me.btnWriteControls.Text = "Write Controls"
        "
        "btnReadControls
        "
        Me.btnReadControls.Location = New System.Drawing.Point(544, 24)
        Me.btnReadControls.Name = "btnReadControls"
        Me.btnReadControls.Size = New System.Drawing.Size(88, 32)
        Me.btnReadControls.TabIndex = 5
        Me.btnReadControls.Text = "Read Controls"
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(400, 24)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(232, 20)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = "TextBox1"
        "
        "TextBox2
        "
        Me.TextBox2.Location = New System.Drawing.Point(400, 68)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.Size = New System.Drawing.Size(232, 20)
        Me.TextBox2.TabIndex = 3
        Me.TextBox2.Text = "TextBox2"
        "
        "TextBox3
        "
        Me.TextBox3.Location = New System.Drawing.Point(400, 112)
        Me.TextBox3.Name = "TextBox3"
        Me.TextBox3.Size = New System.Drawing.Size(232, 20)
        Me.TextBox3.TabIndex = 4
        Me.TextBox3.Text = "TextBox3"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(656, 286)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox3, Me.TextBox2, Me.TextBox1, Me.RichTextBox1, Me.Panel1})
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub btnChangeFont_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles btnChangeFont.Click
        Dim theFont As System.Drawing.Font
        FontDialog1.ShowDialog()
        theFont = FontDialog1.Font
        btnChangeFont.Font = theFont
        RichTextBox1.SelectionFont = theFont
    End Sub
End Class

Copy and paste between RichTextBox

Imports System.Drawing
Imports System.Windows.Forms
public class CopyPasteRichText
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub frmDragRichText_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim txt As String = "The quick brown fox jumps over the lazy dog."
        rchSource.Text = txt
        rchSource.Select(txt.IndexOf("quick"), Len("quick"))
        rchSource.SelectionFont = New Font(rchSource.SelectionFont, FontStyle.Italic)
        rchSource.Select(txt.IndexOf("brown"), Len("brown"))
        rchSource.SelectionFont = New Font(rchSource.SelectionFont, FontStyle.Bold)
        rchSource.SelectionColor = Color.Brown
        rchSource.Select(txt.IndexOf("fox"), Len("fox"))
        rchSource.SelectionFont = New Font(rchSource.SelectionFont, FontStyle.Bold)
        rchSource.SelectionColor = Color.Red
        rchSource.Select(txt.IndexOf("jumps over"), Len("jumps over"))
        rchSource.SelectionFont = New Font(rchSource.SelectionFont, FontStyle.Underline)
        rchSource.Select(txt.IndexOf("lazy"), Len("lazy"))
        rchSource.SelectionFont = New Font(rchSource.SelectionFont, FontStyle.Bold)
        rchSource.Select(txt.IndexOf("dog"), Len("dog"))
        rchSource.SelectionFont = New Font(rchSource.SelectionFont, FontStyle.Bold)
        rchSource.SelectionColor = Color.Blue
        rchSource.Select(0, 0)
    End Sub
    Private Sub btnCopy_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCopy.Click
        Dim data_object As New DataObject
        data_object.SetData(DataFormats.Rtf, rchSource.Rtf)
        data_object.SetData(DataFormats.Text, rchSource.Text)
        Dim html_text As String
        html_text = "<HTML>" & vbCrLf
        html_text &= "  <HEAD>The Quick Brown Fox</HEAD>" & vbCrLf
        html_text &= "  <BODY>" & vbCrLf
        html_text &= rchSource.Text & vbCrLf
        html_text &= "  </BODY>" & vbCrLf & "</HTML>"
        data_object.SetData(DataFormats.Html, html_text)
        Clipboard.SetDataObject(data_object)
    End Sub
    Private Sub btnPaste_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPaste.Click
        Dim data_object As IDataObject = Clipboard.GetDataObject()
        If data_object.GetDataPresent(DataFormats.Rtf) Then
            rchTarget.Rtf = data_object.GetData(DataFormats.Rtf).ToString
            lblRtf.Text = data_object.GetData(DataFormats.Rtf).ToString
        Else
            rchTarget.Text = ""
            lblRtf.Text = ""
        End If
        If data_object.GetDataPresent(DataFormats.Text) Then
            lblTarget.Text = data_object.GetData(DataFormats.Text).ToString
        Else
            lblTarget.Text = ""
        End If
        If data_object.GetDataPresent(DataFormats.Html) Then
            lblHtml.Text = data_object.GetData(DataFormats.Html).ToString
        Else
            lblHtml.Text = ""
        End If
    End Sub
End Class
<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.btnPaste = New System.Windows.Forms.Button
        Me.btnCopy = New System.Windows.Forms.Button
        Me.lblRtf = New System.Windows.Forms.Label
        Me.lblHtml = New System.Windows.Forms.Label
        Me.lblTarget = New System.Windows.Forms.Label
        Me.rchTarget = New System.Windows.Forms.RichTextBox
        Me.rchSource = New System.Windows.Forms.RichTextBox
        Me.SuspendLayout()
        "
        "btnPaste
        "
        Me.btnPaste.Anchor = CType((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.btnPaste.Location = New System.Drawing.Point(240, 40)
        Me.btnPaste.Name = "btnPaste"
        Me.btnPaste.Size = New System.Drawing.Size(48, 24)
        Me.btnPaste.TabIndex = 16
        Me.btnPaste.Text = "Paste"
        "
        "btnCopy
        "
        Me.btnCopy.Location = New System.Drawing.Point(8, 40)
        Me.btnCopy.Name = "btnCopy"
        Me.btnCopy.Size = New System.Drawing.Size(48, 24)
        Me.btnCopy.TabIndex = 15
        Me.btnCopy.Text = "Copy"
        "
        "lblRtf
        "
        Me.lblRtf.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblRtf.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblRtf.Location = New System.Drawing.Point(0, 104)
        Me.lblRtf.Margin = New System.Windows.Forms.Padding(3, 3, 3, 1)
        Me.lblRtf.Name = "lblRtf"
        Me.lblRtf.Size = New System.Drawing.Size(296, 110)
        Me.lblRtf.TabIndex = 14
        "
        "lblHtml
        "
        Me.lblHtml.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblHtml.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblHtml.Location = New System.Drawing.Point(0, 248)
        Me.lblHtml.Margin = New System.Windows.Forms.Padding(3, 2, 3, 3)
        Me.lblHtml.Name = "lblHtml"
        Me.lblHtml.Size = New System.Drawing.Size(296, 80)
        Me.lblHtml.TabIndex = 13
        "
        "lblTarget
        "
        Me.lblTarget.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblTarget.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblTarget.Location = New System.Drawing.Point(0, 216)
        Me.lblTarget.Margin = New System.Windows.Forms.Padding(3, 1, 3, 2)
        Me.lblTarget.Name = "lblTarget"
        Me.lblTarget.Size = New System.Drawing.Size(296, 28)
        Me.lblTarget.TabIndex = 12
        "
        "rchTarget
        "
        Me.rchTarget.AllowDrop = True
        Me.rchTarget.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.rchTarget.Location = New System.Drawing.Point(0, 72)
        Me.rchTarget.Name = "rchTarget"
        Me.rchTarget.Size = New System.Drawing.Size(296, 28)
        Me.rchTarget.TabIndex = 11
        Me.rchTarget.Text = ""
        "
        "rchSource
        "
        Me.rchSource.AllowDrop = True
        Me.rchSource.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.rchSource.Location = New System.Drawing.Point(0, 0)
        Me.rchSource.Name = "rchSource"
        Me.rchSource.Size = New System.Drawing.Size(296, 28)
        Me.rchSource.TabIndex = 10
        Me.rchSource.Text = ""
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(296, 329)
        Me.Controls.Add(Me.btnPaste)
        Me.Controls.Add(Me.btnCopy)
        Me.Controls.Add(Me.lblRtf)
        Me.Controls.Add(Me.lblHtml)
        Me.Controls.Add(Me.lblTarget)
        Me.Controls.Add(Me.rchTarget)
        Me.Controls.Add(Me.rchSource)
        Me.Name = "Form1"
        Me.Text = "CopyPasteRichText"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents btnPaste As System.Windows.Forms.Button
    Friend WithEvents btnCopy As System.Windows.Forms.Button
    Friend WithEvents lblRtf As System.Windows.Forms.Label
    Friend WithEvents lblHtml As System.Windows.Forms.Label
    Friend WithEvents lblTarget As System.Windows.Forms.Label
    Friend WithEvents rchTarget As System.Windows.Forms.RichTextBox
    Friend WithEvents rchSource As System.Windows.Forms.RichTextBox
End Class

Find text in RichTextBox

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RichTextBoxChangeFont
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Button2 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.Button2 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "RichTextBox1
        "
        Me.RichTextBox1.Font = New System.Drawing.Font("Microsoft Sans Serif", 15.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.RichTextBox1.Location = New System.Drawing.Point(24, 72)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(240, 128)
        Me.RichTextBox1.TabIndex = 0
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(104, 216)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Format Text"
        "
        "Button2
        "
        Me.Button2.Location = New System.Drawing.Point(104, 256)
        Me.Button2.Name = "Button2"
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "Save Text"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(288, 285)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.RichTextBox1)
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click
        
        RichTextBox1.Text = "italic, bold, underlined, and strikeout" 
        RichTextBox1.Find("bold")
        Dim fntBold As New Font(RichTextBox1.Font, FontStyle.Bold)
        RichTextBox1.SelectionFont = fntBold
        RichTextBox1.Find("italic")
        Dim fntItalic As New Font(RichTextBox1.Font, FontStyle.Italic)
        RichTextBox1.SelectionFont = fntItalic
        RichTextBox1.Find("strikeout")
        Dim fntStrikeout As New Font(RichTextBox1.Font, FontStyle.Strikeout)
        RichTextBox1.SelectionFont = fntStrikeout
        RichTextBox1.Find("underlined")
        Dim fntUnderline As New Font(RichTextBox1.Font, FontStyle.Underline)
        RichTextBox1.SelectionFont = fntUnderline
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        RichTextBox1.SaveFile("text.rtf")
    End Sub
End Class

Load txt file to RichTextBox

Imports System.Windows.Forms
public class RichTextBoxLoadTextFile
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Private components As System.ruponentModel.IContainer
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "RichTextBox1
        "
        Me.RichTextBox1.Location = New System.Drawing.Point(16, 16)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(264, 168)
        Me.RichTextBox1.TabIndex = 0
        Me.RichTextBox1.Text = ""
        "
        "OpenFileDialog1
        "
        Me.OpenFileDialog1.Filter = "Text Files(*.txt)|*.txt"
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(104, 208)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(88, 32)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Open"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.RichTextBox1)
        Me.Name = "Form1"
        Me.Text = "RichTextBox"
        Me.ResumeLayout(False)
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        RichTextBox1.Text = ""
        OpenFileDialog1.ShowDialog()
        Dim textline As String
        FileOpen(1, OpenFileDialog1.FileName, OpenMode.Input)
        While Not EOF(1)
            textline = LineInput(1)
            RichTextBox1.Text = RichTextBox1.Text + textline + Chr(13) + Chr(10)
        End While
    End Sub
End Class

Print view text in RichTextBox

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class PrintPreview
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Private components As System.ruponentModel.IContainer
    Friend WithEvents PrintDocument1 As System.Drawing.Printing.PrintDocument
    Friend WithEvents PrintPreviewDialog1 As System.Windows.Forms.PrintPreviewDialog
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents SaveFileDialog1 As System.Windows.Forms.SaveFileDialog
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem4 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem5 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem6 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem7 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem8 As System.Windows.Forms.MenuItem
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.PrintDocument1 = New System.Drawing.Printing.PrintDocument
        Me.PrintPreviewDialog1 = New System.Windows.Forms.PrintPreviewDialog
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.SaveFileDialog1 = New System.Windows.Forms.SaveFileDialog
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        Me.MenuItem4 = New System.Windows.Forms.MenuItem
        Me.MenuItem5 = New System.Windows.Forms.MenuItem
        Me.MenuItem6 = New System.Windows.Forms.MenuItem
        Me.MenuItem7 = New System.Windows.Forms.MenuItem
        Me.MenuItem8 = New System.Windows.Forms.MenuItem
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox
        Me.SuspendLayout()
        "
        Me.PrintPreviewDialog1.AutoScrollMargin = New System.Drawing.Size(0, 0)
        Me.PrintPreviewDialog1.AutoScrollMinSize = New System.Drawing.Size(0, 0)
        Me.PrintPreviewDialog1.ClientSize = New System.Drawing.Size(400, 300)
        Me.PrintPreviewDialog1.Document = Me.PrintDocument1
        Me.PrintPreviewDialog1.Enabled = True
        Me.PrintPreviewDialog1.Location = New System.Drawing.Point(147, 19)
        Me.PrintPreviewDialog1.MinimumSize = New System.Drawing.Size(375, 250)
        Me.PrintPreviewDialog1.Name = "PrintPreviewDialog1"
        Me.PrintPreviewDialog1.TransparencyKey = System.Drawing.Color.Empty
        Me.PrintPreviewDialog1.Visible = False
        "
        "MainMenu1
        "
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1})
        "
        "MenuItem1
        "
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2, Me.MenuItem3, Me.MenuItem4, Me.MenuItem5, Me.MenuItem6, Me.MenuItem7, Me.MenuItem8})
        Me.MenuItem1.Text = "File"
        "
        "MenuItem2
        "
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "Open"
        "
        "MenuItem3
        "
        Me.MenuItem3.Index = 1
        Me.MenuItem3.Text = "Save"
        "
        "MenuItem4
        "
        Me.MenuItem4.Index = 2
        Me.MenuItem4.Text = "-"
        "
        "MenuItem5
        "
        Me.MenuItem5.Index = 3
        Me.MenuItem5.Text = "Preview"
        "
        "MenuItem6
        "
        Me.MenuItem6.Index = 4
        Me.MenuItem6.Text = "Print"
        "
        "MenuItem7
        "
        Me.MenuItem7.Index = 5
        Me.MenuItem7.Text = "-"
        "
        "MenuItem8
        "
        Me.MenuItem8.Index = 6
        Me.MenuItem8.Text = "Exit"
        "
        "RichTextBox1
        "
        Me.RichTextBox1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.RichTextBox1.Location = New System.Drawing.Point(0, 0)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(292, 266)
        Me.RichTextBox1.TabIndex = 0
        Me.RichTextBox1.Text = ""
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Controls.Add(Me.RichTextBox1)
        Me.Menu = Me.MainMenu1
        Me.ResumeLayout(False)
    End Sub
    Dim streamToPrint As System.IO.StringReader
    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        RichTextBox1.Text = "asdfasdf"
    End Sub
    Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3.Click
        SaveFileDialog1.ShowDialog()
        RichTextBox1.SaveFile(SaveFileDialog1.FileName)
    End Sub
    Private Sub MenuItem5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem5.Click
        streamToPrint = New System.IO.StringReader(RichTextBox1.Text)
        PrintPreviewDialog1.ShowDialog()
    End Sub
    Private Sub MenuItem6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem6.Click
        streamToPrint = New System.IO.StringReader(RichTextBox1.Text)
        PrintDocument1.Print()
    End Sub
    Private Sub PrintDocument1_PrintPage(ByVal sender As System.Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
        Dim linePerPage As Single = 0
        Dim verticalPostion As Single = 0
        Dim count As Integer = 0
        Dim leftMargin As Single = e.MarginBounds.Left
        Dim topMargin As Single = e.MarginBounds.Top
        Dim strLine As String
        linePerPage = e.MarginBounds.Height / RichTextBox1.Font.GetHeight(e.Graphics)
        strLine = streamToPrint.ReadLine
        While ((count < linePerPage) And Not (strLine Is Nothing))
            verticalPostion = topMargin + (count * RichTextBox1.Font.GetHeight(e.Graphics))
            e.Graphics.DrawString(strLine, RichTextBox1.Font, Brushes.Black, leftMargin, verticalPostion, New StringFormat)
            count = count + 1
            If (count < linePerPage) Then
                strLine = streamToPrint.ReadLine
            End If
        End While
        If (strLine <> Nothing) Then
            e.HasMorePages = True
        Else
            e.HasMorePages = False
        End If
    End Sub
    Private Sub MenuItem8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem8.Click
        End
    End Sub
End Class

RichTextBox Redo/Undo

Imports System.Drawing
Imports System.Windows.Forms
public class RichTextBoxRedoUndo
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub rchNotes_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles rchNotes.TextChanged
        btnUndo.Enabled = rchNotes.CanUndo
        btnRedo.Enabled = rchNotes.CanRedo
        If btnUndo.Enabled Then
            btnUndo.Text = "Undo " & rchNotes.UndoActionName
        Else
            btnUndo.Text = "Undo"
        End If
        If btnRedo.Enabled Then
            If btnRedo.Enabled Then btnRedo.Text = "Redo " & rchNotes.RedoActionName
        Else
            If btnRedo.Enabled Then btnRedo.Text = "Redo"
        End If
    End Sub
    Private Sub btnUndo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUndo.Click
        rchNotes.Undo()
    End Sub
    Private Sub btnRedo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRedo.Click
        rchNotes.Redo()
    End Sub
    Private Sub btnRed_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRed.Click
        rchNotes.SelectionColor = Color.Red
    End Sub
    Private Sub btnBlue_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBlue.Click
        rchNotes.SelectionColor = Color.Blue
    End Sub
End Class
<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.MenuStrip1 = New System.Windows.Forms.MenuStrip
        Me.btnUndo = New System.Windows.Forms.ToolStripMenuItem
        Me.btnRedo = New System.Windows.Forms.ToolStripMenuItem
        Me.btnRed = New System.Windows.Forms.ToolStripMenuItem
        Me.btnBlue = New System.Windows.Forms.ToolStripMenuItem
        Me.rchNotes = New System.Windows.Forms.RichTextBox
        Me.MenuStrip1.SuspendLayout()
        Me.SuspendLayout()
        "
        "MenuStrip1
        "
        Me.MenuStrip1.Items.AddRange(New System.Windows.Forms.ToolStripItem() {Me.btnUndo, Me.btnRedo, Me.btnRed, Me.btnBlue})
        Me.MenuStrip1.Location = New System.Drawing.Point(0, 0)
        Me.MenuStrip1.Name = "MenuStrip1"
        Me.MenuStrip1.Size = New System.Drawing.Size(374, 24)
        Me.MenuStrip1.TabIndex = 5
        Me.MenuStrip1.Text = "MenuStrip1"
        "
        "btnUndo
        "
        Me.btnUndo.Enabled = False
        Me.btnUndo.Name = "btnUndo"
        Me.btnUndo.Text = "Undo"
        "
        "btnRedo
        "
        Me.btnRedo.Enabled = False
        Me.btnRedo.Name = "btnRedo"
        Me.btnRedo.Text = "Redo"
        "
        "btnRed
        "
        Me.btnRed.Name = "btnRed"
        Me.btnRed.Text = "Red"
        "
        "btnBlue
        "
        Me.btnBlue.Name = "btnBlue"
        Me.btnBlue.Text = "Blue"
        "
        "rchNotes
        "
        Me.rchNotes.Dock = System.Windows.Forms.DockStyle.Fill
        Me.rchNotes.Location = New System.Drawing.Point(0, 24)
        Me.rchNotes.Name = "rchNotes"
        Me.rchNotes.Size = New System.Drawing.Size(374, 249)
        Me.rchNotes.TabIndex = 6
        Me.rchNotes.Text = ""
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(374, 273)
        Me.Controls.Add(Me.rchNotes)
        Me.Controls.Add(Me.MenuStrip1)
        Me.Name = "Form1"
        Me.Text = "UseRichTextBox"
        Me.MenuStrip1.ResumeLayout(False)
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents MenuStrip1 As System.Windows.Forms.MenuStrip
    Friend WithEvents btnUndo As System.Windows.Forms.ToolStripMenuItem
    Friend WithEvents btnRedo As System.Windows.Forms.ToolStripMenuItem
    Friend WithEvents btnRed As System.Windows.Forms.ToolStripMenuItem
    Friend WithEvents btnBlue As System.Windows.Forms.ToolStripMenuItem
    Friend WithEvents rchNotes As System.Windows.Forms.RichTextBox
End Class

Save Rtf file from RichTextBox and Read Rtf file to RichTextBox

Option Strict On
Imports System.IO
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RichTextBoxSaveReadFile
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    Friend WithEvents ColorDialog1 As System.Windows.Forms.ColorDialog
    Friend WithEvents FontDialog1 As System.Windows.Forms.FontDialog
    Friend WithEvents SaveFileDialog1 As System.Windows.Forms.SaveFileDialog
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents btnChangeColor As System.Windows.Forms.Button
    Friend WithEvents btnChangeFont As System.Windows.Forms.Button
    Friend WithEvents btnSaveRTF As System.Windows.Forms.Button
    Friend WithEvents btnOpenRTF As System.Windows.Forms.Button
    Friend WithEvents btnWriteControls As System.Windows.Forms.Button
    Friend WithEvents btnReadControls As System.Windows.Forms.Button
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Panel1 = New System.Windows.Forms.Panel()
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox()
        Me.ColorDialog1 = New System.Windows.Forms.ColorDialog()
        Me.FontDialog1 = New System.Windows.Forms.FontDialog()
        Me.SaveFileDialog1 = New System.Windows.Forms.SaveFileDialog()
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog()
        Me.btnChangeColor = New System.Windows.Forms.Button()
        Me.btnChangeFont = New System.Windows.Forms.Button()
        Me.btnSaveRTF = New System.Windows.Forms.Button()
        Me.btnOpenRTF = New System.Windows.Forms.Button()
        Me.btnWriteControls = New System.Windows.Forms.Button()
        Me.btnReadControls = New System.Windows.Forms.Button()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.TextBox2 = New System.Windows.Forms.TextBox()
        Me.TextBox3 = New System.Windows.Forms.TextBox()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        "
        "Panel1
        "
        Me.Panel1.Controls.AddRange(New System.Windows.Forms.Control() {Me.btnReadControls, Me.btnWriteControls, Me.btnOpenRTF, Me.btnSaveRTF, Me.btnChangeFont, Me.btnChangeColor})
        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Bottom
        Me.Panel1.Location = New System.Drawing.Point(0, 222)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(656, 64)
        Me.Panel1.TabIndex = 0
        "
        "RichTextBox1
        "
        Me.RichTextBox1.Location = New System.Drawing.Point(16, 8)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(336, 176)
        Me.RichTextBox1.TabIndex = 1
        Me.RichTextBox1.Text = "Mr. and Mrs. Dursley, of number four, Privet Drive, were proud to say that they w" & _
        "ere perfectly normal, thank you very much."
        "
        "btnChangeColor
        "
        Me.btnChangeColor.Location = New System.Drawing.Point(24, 24)
        Me.btnChangeColor.Name = "btnChangeColor"
        Me.btnChangeColor.Size = New System.Drawing.Size(88, 32)
        Me.btnChangeColor.TabIndex = 0
        Me.btnChangeColor.Text = "Change Color"
        "
        "btnChangeFont
        "
        Me.btnChangeFont.Location = New System.Drawing.Point(128, 24)
        Me.btnChangeFont.Name = "btnChangeFont"
        Me.btnChangeFont.Size = New System.Drawing.Size(88, 32)
        Me.btnChangeFont.TabIndex = 1
        Me.btnChangeFont.Text = "Change Font"
        "
        "btnSaveRTF
        "
        Me.btnSaveRTF.Location = New System.Drawing.Point(232, 24)
        Me.btnSaveRTF.Name = "btnSaveRTF"
        Me.btnSaveRTF.Size = New System.Drawing.Size(88, 32)
        Me.btnSaveRTF.TabIndex = 2
        Me.btnSaveRTF.Text = "Save RTF"
        "
        "btnOpenRTF
        "
        Me.btnOpenRTF.Location = New System.Drawing.Point(336, 24)
        Me.btnOpenRTF.Name = "btnOpenRTF"
        Me.btnOpenRTF.Size = New System.Drawing.Size(88, 32)
        Me.btnOpenRTF.TabIndex = 3
        Me.btnOpenRTF.Text = "Open RTF"
        "
        "btnWriteControls
        "
        Me.btnWriteControls.Location = New System.Drawing.Point(440, 24)
        Me.btnWriteControls.Name = "btnWriteControls"
        Me.btnWriteControls.Size = New System.Drawing.Size(88, 32)
        Me.btnWriteControls.TabIndex = 4
        Me.btnWriteControls.Text = "Write Controls"
        "
        "btnReadControls
        "
        Me.btnReadControls.Location = New System.Drawing.Point(544, 24)
        Me.btnReadControls.Name = "btnReadControls"
        Me.btnReadControls.Size = New System.Drawing.Size(88, 32)
        Me.btnReadControls.TabIndex = 5
        Me.btnReadControls.Text = "Read Controls"
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(400, 24)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(232, 20)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = "TextBox1"
        "
        "TextBox2
        "
        Me.TextBox2.Location = New System.Drawing.Point(400, 68)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.Size = New System.Drawing.Size(232, 20)
        Me.TextBox2.TabIndex = 3
        Me.TextBox2.Text = "TextBox2"
        "
        "TextBox3
        "
        Me.TextBox3.Location = New System.Drawing.Point(400, 112)
        Me.TextBox3.Name = "TextBox3"
        Me.TextBox3.Size = New System.Drawing.Size(232, 20)
        Me.TextBox3.TabIndex = 4
        Me.TextBox3.Text = "TextBox3"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(656, 286)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox3, Me.TextBox2, Me.TextBox1, Me.RichTextBox1, Me.Panel1})
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)
    End Sub
#End Region

    Private Sub btnSaveRTF_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles btnSaveRTF.Click
        SaveFileDialog1.InitialDirectory = Application.ExecutablePath
        SaveFileDialog1.DefaultExt = "rtf"
        SaveFileDialog1.FileName = "NewFile"
        SaveFileDialog1.Filter = "Rich Text Files (*.rtf)|*.rtf|All Files (*.*) | *.*"
        SaveFileDialog1.ShowDialog()
        RichTextBox1.SaveFile(SaveFileDialog1.FileName)
    End Sub
    Private Sub btnOpenRTF_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles btnOpenRTF.Click
        OpenFileDialog1.InitialDirectory = Application.ExecutablePath
        OpenFileDialog1.DefaultExt = "rtf"
        OpenFileDialog1.FileName = "NewFile"
        OpenFileDialog1.Filter = "Rich Text Files (*.rtf)|*.rtf|All Files (*.*) | *.*"
        OpenFileDialog1.ShowDialog()
        RichTextBox1.LoadFile(OpenFileDialog1.FileName)
    End Sub
End Class

Save text in RichTextBox into a file

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class PrintPreview
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Private components As System.ruponentModel.IContainer
    Friend WithEvents PrintDocument1 As System.Drawing.Printing.PrintDocument
    Friend WithEvents PrintPreviewDialog1 As System.Windows.Forms.PrintPreviewDialog
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents SaveFileDialog1 As System.Windows.Forms.SaveFileDialog
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem4 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem5 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem6 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem7 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem8 As System.Windows.Forms.MenuItem
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.PrintDocument1 = New System.Drawing.Printing.PrintDocument
        Me.PrintPreviewDialog1 = New System.Windows.Forms.PrintPreviewDialog
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.SaveFileDialog1 = New System.Windows.Forms.SaveFileDialog
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        Me.MenuItem4 = New System.Windows.Forms.MenuItem
        Me.MenuItem5 = New System.Windows.Forms.MenuItem
        Me.MenuItem6 = New System.Windows.Forms.MenuItem
        Me.MenuItem7 = New System.Windows.Forms.MenuItem
        Me.MenuItem8 = New System.Windows.Forms.MenuItem
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox
        Me.SuspendLayout()
        "
        Me.PrintPreviewDialog1.AutoScrollMargin = New System.Drawing.Size(0, 0)
        Me.PrintPreviewDialog1.AutoScrollMinSize = New System.Drawing.Size(0, 0)
        Me.PrintPreviewDialog1.ClientSize = New System.Drawing.Size(400, 300)
        Me.PrintPreviewDialog1.Document = Me.PrintDocument1
        Me.PrintPreviewDialog1.Enabled = True
        Me.PrintPreviewDialog1.Location = New System.Drawing.Point(147, 19)
        Me.PrintPreviewDialog1.MinimumSize = New System.Drawing.Size(375, 250)
        Me.PrintPreviewDialog1.Name = "PrintPreviewDialog1"
        Me.PrintPreviewDialog1.TransparencyKey = System.Drawing.Color.Empty
        Me.PrintPreviewDialog1.Visible = False
        "
        "MainMenu1
        "
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1})
        "
        "MenuItem1
        "
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2, Me.MenuItem3, Me.MenuItem4, Me.MenuItem5, Me.MenuItem6, Me.MenuItem7, Me.MenuItem8})
        Me.MenuItem1.Text = "File"
        "
        "MenuItem2
        "
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "Open"
        "
        "MenuItem3
        "
        Me.MenuItem3.Index = 1
        Me.MenuItem3.Text = "Save"
        "
        "MenuItem4
        Me.MenuItem8.Index = 6
        Me.MenuItem8.Text = "Exit"
        "
        "RichTextBox1
        "
        Me.RichTextBox1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.RichTextBox1.Location = New System.Drawing.Point(0, 0)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(292, 266)
        Me.RichTextBox1.TabIndex = 0
        Me.RichTextBox1.Text = ""
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Controls.Add(Me.RichTextBox1)
        Me.Menu = Me.MainMenu1
        Me.ResumeLayout(False)
    End Sub
    Dim streamToPrint As System.IO.StringReader
    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        RichTextBox1.Text = "asdfasdf"
    End Sub
    Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3.Click
        SaveFileDialog1.ShowDialog()
        RichTextBox1.SaveFile(SaveFileDialog1.FileName)
    End Sub

    Private Sub MenuItem8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem8.Click
        End
    End Sub
End Class

Simple Editor based on RichTextBox

Imports System.Windows.Forms
public class SimpleEditorBasedOnRichTextBox
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Private components As System.ruponentModel.IContainer
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem4 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem5 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem6 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem7 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem8 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem9 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem10 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem11 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem12 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem13 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem14 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem15 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem16 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem17 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem18 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem19 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem20 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem21 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem22 As System.Windows.Forms.MenuItem
    Friend WithEvents SaveFileDialog1 As System.Windows.Forms.SaveFileDialog
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        Me.MenuItem4 = New System.Windows.Forms.MenuItem
        Me.MenuItem5 = New System.Windows.Forms.MenuItem
        Me.MenuItem6 = New System.Windows.Forms.MenuItem
        Me.MenuItem7 = New System.Windows.Forms.MenuItem
        Me.MenuItem8 = New System.Windows.Forms.MenuItem
        Me.MenuItem9 = New System.Windows.Forms.MenuItem
        Me.MenuItem10 = New System.Windows.Forms.MenuItem
        Me.MenuItem11 = New System.Windows.Forms.MenuItem
        Me.MenuItem12 = New System.Windows.Forms.MenuItem
        Me.MenuItem14 = New System.Windows.Forms.MenuItem
        Me.MenuItem13 = New System.Windows.Forms.MenuItem
        Me.MenuItem15 = New System.Windows.Forms.MenuItem
        Me.MenuItem17 = New System.Windows.Forms.MenuItem
        Me.MenuItem18 = New System.Windows.Forms.MenuItem
        Me.MenuItem19 = New System.Windows.Forms.MenuItem
        Me.MenuItem16 = New System.Windows.Forms.MenuItem
        Me.MenuItem20 = New System.Windows.Forms.MenuItem
        Me.MenuItem21 = New System.Windows.Forms.MenuItem
        Me.MenuItem22 = New System.Windows.Forms.MenuItem
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox
        Me.SaveFileDialog1 = New System.Windows.Forms.SaveFileDialog
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.SuspendLayout()
        "
        "MainMenu1
        "
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1, Me.MenuItem6, Me.MenuItem10})
        "
        "MenuItem1
        "
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2, Me.MenuItem3, Me.MenuItem4, Me.MenuItem5})
        Me.MenuItem1.Text = "File"
        "
        "MenuItem2
        "
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "New"
        "
        "MenuItem3
        "
        Me.MenuItem3.Index = 1
        Me.MenuItem3.Text = "Open"
        "
        "MenuItem4
        "
        Me.MenuItem4.Index = 2
        Me.MenuItem4.Text = "Save"
        "
        "MenuItem5
        "
        Me.MenuItem5.Index = 3
        Me.MenuItem5.Text = "Exit"
        "
        "MenuItem6
        "
        Me.MenuItem6.Index = 1
        Me.MenuItem6.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem7, Me.MenuItem8, Me.MenuItem9})
        Me.MenuItem6.Text = "Edit"
        "
        "MenuItem7
        "
        Me.MenuItem7.Index = 0
        Me.MenuItem7.Text = "Cut"
        "
        "MenuItem8
        "
        Me.MenuItem8.Index = 1
        Me.MenuItem8.Text = "Copy"
        "
        "MenuItem9
        "
        Me.MenuItem9.Index = 2
        Me.MenuItem9.Text = "Paste"
        "
        "MenuItem10
        "
        Me.MenuItem10.Index = 2
        Me.MenuItem10.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem11, Me.MenuItem13})
        Me.MenuItem10.Text = "Font Color"
        "
        "MenuItem11
        "
        Me.MenuItem11.Index = 0
        Me.MenuItem11.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem12, Me.MenuItem14})
        Me.MenuItem11.Text = "Size"
        "
        "MenuItem12
        "
        Me.MenuItem12.Index = 0
        Me.MenuItem12.Text = "Smaller Font"
        "
        "MenuItem14
        "
        Me.MenuItem14.Index = 1
        Me.MenuItem14.Text = "Larger Font"
        "
        "MenuItem13
        "
        Me.MenuItem13.Index = 1
        Me.MenuItem13.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem15, Me.MenuItem16})
        Me.MenuItem13.Text = "Color"
        "
        "MenuItem15
        "
        Me.MenuItem15.Index = 0
        Me.MenuItem15.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem17, Me.MenuItem18, Me.MenuItem19})
        Me.MenuItem15.Text = "Foreground"
        "
        "MenuItem17
        "
        Me.MenuItem17.Index = 0
        Me.MenuItem17.Text = "Red"
        "
        "MenuItem18
        "
        Me.MenuItem18.Index = 1
        Me.MenuItem18.Text = "Yellow"
        "
        "MenuItem19
        "
        Me.MenuItem19.Index = 2
        Me.MenuItem19.Text = "Green"
        "
        "MenuItem16
        "
        Me.MenuItem16.Index = 1
        Me.MenuItem16.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem20, Me.MenuItem21, Me.MenuItem22})
        Me.MenuItem16.Text = "Background"
        "
        "MenuItem20
        "
        Me.MenuItem20.Index = 0
        Me.MenuItem20.Text = "Red"
        "
        "MenuItem21
        "
        Me.MenuItem21.Index = 1
        Me.MenuItem21.Text = "Yellow"
        "
        "MenuItem22
        "
        Me.MenuItem22.Index = 2
        Me.MenuItem22.Text = "Green"
        "
        "RichTextBox1
        "
        Me.RichTextBox1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.RichTextBox1.Location = New System.Drawing.Point(0, 0)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(292, 266)
        Me.RichTextBox1.TabIndex = 0
        Me.RichTextBox1.Text = ""
        "
        "SaveFileDialog1
        "
        Me.SaveFileDialog1.Filter = "Text(*.txt)|*.txt"
        "
        "OpenFileDialog1
        "
        Me.OpenFileDialog1.Filter = "Text(*.txt)|*.txt"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Controls.Add(Me.RichTextBox1)
        Me.Menu = Me.MainMenu1
        Me.ResumeLayout(False)
    End Sub
    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        RichTextBox1.Text = ""
        Form1.ActiveForm.Text = "NoName"
    End Sub
    Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3.Click
        Dim textline As String
        OpenFileDialog1.ShowDialog()
        FileOpen(1, OpenFileDialog1.FileName, OpenMode.Input)
        While Not EOF(1)
            textline = LineInput(1)
            RichTextBox1.Text = RichTextBox1.Text + textline + Chr(13) + Chr(10)
        End While
        FileClose(1)
        Form1.ActiveForm.Text = OpenFileDialog1.FileName
    End Sub
    Private Sub MenuItem4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem4.Click
        SaveFileDialog1.ShowDialog()
        RichTextBox1.SaveFile(SaveFileDialog1.FileName)
        Form1.ActiveForm.Text = SaveFileDialog1.FileName
    End Sub
    Private Sub MenuItem5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem5.Click
        End
    End Sub
    Private Sub MenuItem7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem7.Click
        RichTextBox1.Cut()
    End Sub
    Private Sub MenuItem8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem8.Click
        RichTextBox1.Copy()
    End Sub
    Private Sub MenuItem9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem9.Click
        RichTextBox1.Paste()
    End Sub
    Private Sub MenuItem12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem12.Click
        RichTextBox1.Font = New System.Drawing.Font("", 10)
    End Sub
    Private Sub MenuItem14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem14.Click
        RichTextBox1.Font = New System.Drawing.Font("", 20)
    End Sub
    Private Sub MenuItem17_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem17.Click
        RichTextBox1.ForeColor = System.Drawing.Color.Red
    End Sub
    Private Sub MenuItem18_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem18.Click
        RichTextBox1.ForeColor = System.Drawing.Color.Yellow
    End Sub
    Private Sub MenuItem19_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem19.Click
        RichTextBox1.ForeColor = System.Drawing.Color.Green
    End Sub
    Private Sub MenuItem20_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem20.Click
        RichTextBox1.BackColor = System.Drawing.Color.Red
    End Sub
    Private Sub MenuItem21_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem21.Click
        RichTextBox1.BackColor = System.Drawing.Color.Yellow
    End Sub
    Private Sub MenuItem22_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem22.Click
        RichTextBox1.BackColor = System.Drawing.Color.Green
    End Sub
End Class

VB.Net Tutorial/GUI/RichTextBox — различия между версиями

Текущая версия на 12:56, 26 мая 2010

Содержание

Change RichTextBox Selection color

Change RichTextBox Selection Font

Copy and paste between RichTextBox

Find text in RichTextBox

Load txt file to RichTextBox

Print view text in RichTextBox

RichTextBox Redo/Undo

Save Rtf file from RichTextBox and Read Rtf file to RichTextBox

Save text in RichTextBox into a file

Simple Editor based on RichTextBox

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