VB.Net Tutorial/GUI/ComboBox

Add value to ComboBox

Imports System.Windows.Forms
public class ComboBoxAddSelection
   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 ComboBox1 As System.Windows.Forms.ruboBox
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ruboBox1 = New System.Windows.Forms.ruboBox
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        "
        "ComboBox1
        "
        Me.ruboBox1.Items.AddRange(New Object() {"AAAAA", "BBBBB", "CCCCC"})
        Me.ruboBox1.Location = New System.Drawing.Point(48, 16)
        Me.ruboBox1.Name = "ComboBox1"
        Me.ruboBox1.Size = New System.Drawing.Size(144, 21)
        Me.ruboBox1.TabIndex = 0
        Me.ruboBox1.Text = "Select"
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(24, 64)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(96, 20)
        Me.TextBox1.TabIndex = 1
        Me.TextBox1.Text = ""
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(144, 64)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 24)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "Add"
        "
        "Label1
        "
        Me.Label1.Location = New System.Drawing.Point(40, 120)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(168, 24)
        Me.Label1.TabIndex = 3
        Me.Label1.Text = "Select"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(264, 182)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.ruboBox1)
        Me.ResumeLayout(False)
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ComboBox1.Items.Add(TextBox1.Text)
        TextBox1.Text = ""
    End Sub
    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Select Case ComboBox1.SelectedIndex
            Case 0
                Label1.Text = "A"
            Case 1
                Label1.Text = "B"
            Case 2
                Label1.Text = "C"
        End Select
    End Sub
End Class

ComboBox Cell renderer

Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected 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.XButton = New System.Windows.Forms.Button
        Me.ColorList = New System.Windows.Forms.ruboBox
        Me.SuspendLayout()
        "
        "XButton
        "
        Me.XButton.Location = New System.Drawing.Point(112, 24)
        Me.XButton.Name = "XButton"
        Me.XButton.Size = New System.Drawing.Size(75, 23)
        Me.XButton.TabIndex = 0
        Me.XButton.Text = "Button1"
        Me.XButton.UseVisualStyleBackColor = True
        "
        "ColorList
        "
        Me.ColorList.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawFixed
        Me.ColorList.DropDownStyle = System.Windows.Forms.ruboBoxStyle.DropDownList
        Me.ColorList.FormattingEnabled = True
        Me.ColorList.Location = New System.Drawing.Point(88, 64)
        Me.ColorList.Name = "ColorList"
        Me.ColorList.Size = New System.Drawing.Size(121, 21)
        Me.ColorList.TabIndex = 1
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(292, 221)
        Me.Controls.Add(Me.ColorList)
        Me.Controls.Add(Me.XButton)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.MaximizeBox = False
        Me.Name = "Form1"
        Me.Text = "Control Drawing"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents XButton As System.Windows.Forms.Button
    Friend WithEvents ColorList As System.Windows.Forms.ruboBox
End Class
Public Class Form1
    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        ColorList.Items.Add("Red")
        ColorList.Items.Add("Orange")
        ColorList.Items.Add("Yellow")
        ColorList.Items.Add("Green")
        ColorList.Items.Add("Blue")
        ColorList.Items.Add("Indigo")
        ColorList.Items.Add("Violet")
    End Sub
    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        e.Graphics.DrawEllipse(Pens.Black, 10, 10, Me.ClientRectangle.Width - 20, _
            Me.ClientRectangle.Height - 20)
    End Sub
    Private Sub XButton_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles XButton.Paint
        Dim usePen As Pen
        e.Graphics.Clear(SystemColors.Control)
        usePen = New Pen(SystemColors.ControlText, 3)
        e.Graphics.DrawRectangle(usePen, XButton.ClientRectangle)
        usePen.Dispose()
    End Sub
    Private Sub ColorList_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles ColorList.DrawItem
        Dim useBrush As Brush
        If (e.Index = -1) Then Return
        e.DrawBackground()
        useBrush = New SolidBrush(Color.FromName(CStr(ColorList.Items(e.Index))))
        e.Graphics.FillRectangle(useBrush, _
            e.Bounds.Left + 2, e.Bounds.Top + 2, _
            e.Bounds.Width - 4, e.Bounds.Height - 4)
        useBrush.Dispose()
        e.Graphics.DrawRectangle(Pens.Black, _
            e.Bounds.Left + 2, e.Bounds.Top + 2, _
            e.Bounds.Width - 4, e.Bounds.Height - 4)
        e.DrawFocusRectangle()
    End Sub
    Private Sub XButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles XButton.Click
        MsgBox("Button clicked.")
    End Sub
End Class
public class ComboBoxCellRenderer
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

ComboBox Selected Index Changed event

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class ComboBoxSelectionEventAddValue
   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 ComboBox1 As System.Windows.Forms.ruboBox
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ruboBox1 = New System.Windows.Forms.ruboBox
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        "
        "ComboBox1
        "
        Me.ruboBox1.Location = New System.Drawing.Point(72, 72)
        Me.ruboBox1.Name = "ComboBox1"
        Me.ruboBox1.Size = New System.Drawing.Size(121, 21)
        Me.ruboBox1.TabIndex = 0
        Me.ruboBox1.Text = "ComboBox1"
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(16, 168)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(256, 20)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = ""
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.ruboBox1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For i As Integer = 0 To 10
            ComboBox1.Items.Add("Item " + i.ToString())
        Next
        ComboBox1.Text = "Choose one..."
    End Sub
    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Dim intSelectedIndex As Integer
        intSelectedIndex = ComboBox1.SelectedIndex
        Dim objSelectedItem As Object
        objSelectedItem = ComboBox1.SelectedItem
        TextBox1.Text = "Item"s index: " & intSelectedIndex & _
        ". Item"s text: " & objSelectedItem.ToString()
    End Sub
End Class

ComboBox selection event and Add items

Imports System.Windows.Forms
public class ComboBoxAddSelection
   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 ComboBox1 As System.Windows.Forms.ruboBox
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ruboBox1 = New System.Windows.Forms.ruboBox
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        "
        "ComboBox1
        "
        Me.ruboBox1.Items.AddRange(New Object() {"AAAAA", "BBBBB", "CCCCC"})
        Me.ruboBox1.Location = New System.Drawing.Point(48, 16)
        Me.ruboBox1.Name = "ComboBox1"
        Me.ruboBox1.Size = New System.Drawing.Size(144, 21)
        Me.ruboBox1.TabIndex = 0
        Me.ruboBox1.Text = "Select"
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(24, 64)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(96, 20)
        Me.TextBox1.TabIndex = 1
        Me.TextBox1.Text = ""
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(144, 64)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 24)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "Add"
        "
        "Label1
        "
        Me.Label1.Location = New System.Drawing.Point(40, 120)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(168, 24)
        Me.Label1.TabIndex = 3
        Me.Label1.Text = "Select"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(264, 182)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.ruboBox1)
        Me.ResumeLayout(False)
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ComboBox1.Items.Add(TextBox1.Text)
        TextBox1.Text = ""
    End Sub
    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Select Case ComboBox1.SelectedIndex
            Case 0
                Label1.Text = "A"
            Case 1
                Label1.Text = "B"
            Case 2
                Label1.Text = "C"
        End Select
    End Sub
End Class

Get Text from ComboBox

Imports System.Windows.Forms
public class GetComboBoxText
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, _
                              ByVal e As System.EventArgs) _
                              Handles Button1.Click
        Dim Language As String
        Language = ComboBox1.Text
        If Language = "Visual Basic" Then
            MsgBox("We have a winner!")
        Else
            MsgBox(Language & " is not a bad language.")
        End If
    End Sub
End Class
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    <System.Diagnostics.DebuggerNonUserCode()> _
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
    End Sub
    "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.Label1 = New System.Windows.Forms.Label
        Me.Button1 = New System.Windows.Forms.Button
        Me.ruboBox1 = New System.Windows.Forms.ruboBox
        Me.SuspendLayout()
        "
        "Label1
        "
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(13, 22)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(160, 14)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "What"s your favorite language?"
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(13, 70)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(267, 23)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "Evaluate my choice"
        "
        "ComboBox1
        "
        Me.ruboBox1.FormattingEnabled = True
        Me.ruboBox1.Items.AddRange(New Object() {"C++", "C#", "Java", "Visual Basic", "Cobol"})
        Me.ruboBox1.Location = New System.Drawing.Point(13, 43)
        Me.ruboBox1.Name = "ComboBox1"
        Me.ruboBox1.Size = New System.Drawing.Size(267, 21)
        Me.ruboBox1.TabIndex = 1
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 117)
        Me.Controls.Add(Me.ruboBox1)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox
End Class

HatchBrush Illustration by using ComboBox

Imports System
Imports System.Drawing
Imports System.Collections
Imports System.ruponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Drawing.Drawing2D
public class HatchBrushStyleComboBox
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1
    Inherits System.Windows.Forms.Form
    Private style As New HatchStyle
    Private forClr As Color = Color.Blue
    Private backClr As Color = Color.Red
#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 Label1 As System.Windows.Forms.Label
    Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents ForColorBtn As System.Windows.Forms.Button
    Friend WithEvents BackGroundBtn As System.Windows.Forms.Button
    Friend WithEvents ApplyBtn As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.ruboBox1 = New System.Windows.Forms.ruboBox
        Me.Label2 = New System.Windows.Forms.Label
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Label3 = New System.Windows.Forms.Label
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.ForColorBtn = New System.Windows.Forms.Button
        Me.BackGroundBtn = New System.Windows.Forms.Button
        Me.ApplyBtn = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "Label1
        "
        Me.Label1.Location = New System.Drawing.Point(8, 8)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(72, 23)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Select Style:"
        "
        "ComboBox1
        "
        Me.ruboBox1.Location = New System.Drawing.Point(96, 8)
        Me.ruboBox1.Name = "ComboBox1"
        Me.ruboBox1.Size = New System.Drawing.Size(121, 21)
        Me.ruboBox1.TabIndex = 1
        Me.ruboBox1.Text = "ComboBox1"
        "
        "Label2
        "
        Me.Label2.Location = New System.Drawing.Point(8, 40)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(96, 23)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "Forground Color:"
        "
        "TextBox1
        "
        Me.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.TextBox1.Location = New System.Drawing.Point(112, 40)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.ReadOnly = True
        Me.TextBox1.Size = New System.Drawing.Size(32, 20)
        Me.TextBox1.TabIndex = 3
        Me.TextBox1.Text = ""
        "
        "Label3
        "
        Me.Label3.Location = New System.Drawing.Point(0, 72)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(104, 23)
        Me.Label3.TabIndex = 4
        Me.Label3.Text = "Background Color:"
        "
        "TextBox2
        "
        Me.TextBox2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.TextBox2.Location = New System.Drawing.Point(112, 72)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.ReadOnly = True
        Me.TextBox2.Size = New System.Drawing.Size(32, 20)
        Me.TextBox2.TabIndex = 5
        Me.TextBox2.Text = ""
        "
        "ForColorBtn
        "
        Me.ForColorBtn.Location = New System.Drawing.Point(152, 40)
        Me.ForColorBtn.Name = "ForColorBtn"
        Me.ForColorBtn.Size = New System.Drawing.Size(48, 23)
        Me.ForColorBtn.TabIndex = 6
        Me.ForColorBtn.Text = "Pick..."
        "
        "BackGroundBtn
        "
        Me.BackGroundBtn.Location = New System.Drawing.Point(152, 72)
        Me.BackGroundBtn.Name = "BackGroundBtn"
        Me.BackGroundBtn.Size = New System.Drawing.Size(48, 23)
        Me.BackGroundBtn.TabIndex = 7
        Me.BackGroundBtn.Text = "Pic..."
        "
        "ApplyBtn
        "
        Me.ApplyBtn.Location = New System.Drawing.Point(224, 72)
        Me.ApplyBtn.Name = "ApplyBtn"
        Me.ApplyBtn.TabIndex = 8
        Me.ApplyBtn.Text = "Apply"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(416, 325)
        Me.Controls.Add(Me.ApplyBtn)
        Me.Controls.Add(Me.BackGroundBtn)
        Me.Controls.Add(Me.ForColorBtn)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.ruboBox1)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "Hatch Brushes"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        FillHatchStyles()
    End Sub
    Private Sub FillHatchStyles()
        comboBox1.Items.Add(HatchStyle.BackwardDiagonal.ToString())
        comboBox1.Items.Add(HatchStyle.Cross.ToString())
        comboBox1.Items.Add(HatchStyle.DashedVertical.ToString())
        comboBox1.Items.Add(HatchStyle.DiagonalCross.ToString())
        comboBox1.Items.Add(HatchStyle.HorizontalBrick.ToString())
        comboBox1.Items.Add(HatchStyle.LightDownwardDiagonal.ToString())
        comboBox1.Items.Add(HatchStyle.LightUpwardDiagonal.ToString())
        comboBox1.Text = HatchStyle.BackwardDiagonal.ToString()
    End Sub "FillHatchStyles

    Private Sub ApplyBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ApplyBtn.Click
        Dim g As Graphics = Me.CreateGraphics()
        g.Clear(Me.BackColor)
        Dim str As String = ComboBox1.Text
        Select Case str
            Case "BackwardDiagonal"
                style = HatchStyle.BackwardDiagonal
            Case "DashedVertical"
                style = HatchStyle.DashedVertical
            Case "Cross"
                style = HatchStyle.Cross
            Case "DiagonalCross"
                style = HatchStyle.DiagonalCross
            Case "HorizontalBrick"
                style = HatchStyle.HorizontalBrick
            Case "LightDownwardDiagonal"
                style = HatchStyle.LightDownwardDiagonal
            Case "LightUpwardDiagonal"
                style = HatchStyle.LightUpwardDiagonal
            Case Else
        End Select
        Dim brush As New HatchBrush(style, forClr, backClr)
        g.FillRectangle(brush, 50, 100, 200, 200)
        brush.Dispose()
        g.Dispose()
    End Sub
End Class

Set text for ComboBox

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class ComboBoxSelectionEventAddValue
   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 ComboBox1 As System.Windows.Forms.ruboBox
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ruboBox1 = New System.Windows.Forms.ruboBox
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        "
        "ComboBox1
        "
        Me.ruboBox1.Location = New System.Drawing.Point(72, 72)
        Me.ruboBox1.Name = "ComboBox1"
        Me.ruboBox1.Size = New System.Drawing.Size(121, 21)
        Me.ruboBox1.TabIndex = 0
        Me.ruboBox1.Text = "ComboBox1"
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(16, 168)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(256, 20)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = ""
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.ruboBox1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For i As Integer = 0 To 10
            ComboBox1.Items.Add("Item " + i.ToString())
        Next
        ComboBox1.Text = "Choose one..."
    End Sub
    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Dim intSelectedIndex As Integer
        intSelectedIndex = ComboBox1.SelectedIndex
        Dim objSelectedItem As Object
        objSelectedItem = ComboBox1.SelectedItem
        TextBox1.Text = "Item"s index: " & intSelectedIndex & _
        ". Item"s text: " & objSelectedItem.ToString()
    End Sub
End Class

Use ComboBox to control TextBox font color

Imports System.Windows.Forms
public class ComboBoxSelectionEvent
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Select Case ComboBox1.SelectedIndex
            Case 0
                TextBox1.ForeColor = System.Drawing.Color.Yellow
            Case 1
                TextBox1.ForeColor = System.Drawing.Color.Red
            Case 2
                TextBox1.ForeColor = System.Drawing.Color.Blue
            Case 3
                TextBox1.ForeColor = System.Drawing.Color.Black
        End Select
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected 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.ruboBox1 = New System.Windows.Forms.ruboBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        "
        "ComboBox1
        "
        Me.ruboBox1.DropDownStyle = System.Windows.Forms.ruboBoxStyle.DropDownList
        Me.ruboBox1.FormattingEnabled = True
        Me.ruboBox1.Items.AddRange(New Object() {"Yellow", "Red", "Blue", "Black"})
        Me.ruboBox1.Location = New System.Drawing.Point(19, 30)
        Me.ruboBox1.Margin = New System.Windows.Forms.Padding(4, 4, 4, 4)
        Me.ruboBox1.Name = "ComboBox1"
        Me.ruboBox1.Size = New System.Drawing.Size(476, 23)
        Me.ruboBox1.TabIndex = 0
        "
        "Label1
        "
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(16, 11)
        Me.Label1.Margin = New System.Windows.Forms.Padding(4, 0, 4, 0)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(67, 15)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "Color"
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(16, 62)
        Me.TextBox1.Margin = New System.Windows.Forms.Padding(4, 4, 4, 4)
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(479, 169)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = "www.vbex.ru"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(8.0!, 15.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(513, 242)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.ruboBox1)
        Me.Margin = New System.Windows.Forms.Padding(4, 4, 4, 4)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents ComboBox1 As System.Windows.Forms.ruboBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
End Class

Using ComboBox to select shape to draw

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class DrawShapes
   public Shared Sub Main
        Application.Run(New FrmComboBox)
   End Sub
End class
Public Class FrmComboBox
   Inherits 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
   " contains shape list (circle, square, ellipse, pie) 
   Friend WithEvents cboImage As System.Windows.Forms.ruboBox
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.Container
   "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.cboImage = New System.Windows.Forms.ruboBox()
      Me.SuspendLayout()
      "
      "cboImage
      "
      Me.cboImage.DropDownWidth = 121
      Me.cboImage.Items.AddRange(New Object() {"Circle", "Square", "Ellipse", "Pie", "Filled Circle", "Filled Square", "Filled Ellipse", "Filled Pie"})
      Me.cboImage.Location = New System.Drawing.Point(24, 16)
      Me.cboImage.Name = "cboImage"
      Me.cboImage.Size = New System.Drawing.Size(121, 21)
      Me.cboImage.TabIndex = 0
      "
      "FrmComboBox
      "
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(292, 273)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cboImage})
      Me.Name = "FrmComboBox"
      Me.Text = "ComboBoxTest"
      Me.ResumeLayout(False)
   End Sub
#End Region
   Private Sub cboImage_SelectedIndexChanged _
      (ByVal sender As System.Object, _
      ByVal e As System.EventArgs) _
      Handles cboImage.SelectedIndexChanged
      Dim myGraphics As Graphics = MyBase.CreateGraphics()
      Dim myPen As New Pen(Color.DarkRed)
      Dim mySolidBrush As New SolidBrush(Color.DarkRed)
      myGraphics.Clear(Color.White)
      Select Case cboImage.SelectedIndex
         Case 0 " case circle is selected
            myGraphics.DrawEllipse(myPen, 50, 50, 150, 150)
         Case 1 
            myGraphics.DrawRectangle(myPen, 50, 50, 150, 150)
         Case 2 
            myGraphics.DrawEllipse(myPen, 50, 85, 150, 115)
         Case 3 
            myGraphics.DrawPie(myPen, 50, 50, 150, 150, 0, 45)
         Case 4 
            myGraphics.FillEllipse(mySolidBrush, 50, 50, 150, 150)
         Case 5 
            myGraphics.FillRectangle(mySolidBrush, 50, 50, 150, 150)
         Case 6 
            myGraphics.FillEllipse(mySolidBrush, 50, 85, 150, 115)
         Case 7 
            myGraphics.FillPie(mySolidBrush, 50, 50, 150, 150, 0, 45)
      End Select
   End Sub
End Class