VB.Net/GUI/Control — различия между версиями

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Текущая версия на 12:43, 26 мая 2010

Adding a control to a Form at run time

Imports System
Imports System.Collections
Imports System.Data
Imports System.IO
Imports System.Xml.Serialization
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Text
Imports System.Drawing.Printing

Public Class MainClass
    Shared Sub Main()
       Dim form1 As Form = New Form1()
       Application.Run(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.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()
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(304, 268)
        Me.Name = "Form1"
        Me.Text = "Adding a control at run time!"
    End Sub
#End Region
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
     System.EventArgs) Handles MyBase.Load
        Dim newButton As New System.Windows.Forms.Button()
        With newButton
            .Visible = True
            .Size = New Size(100, 100)
            .Text = "I"m a new button"
        End With
        Me.Controls.Add(newButton)
        AddHandler newButton.Click, AddressOf Me.newButton_Click
    End Sub
    Public Sub newButton_Click(ByVal sender As _
     System.Object, ByVal e As System.EventArgs)
        MessageBox.Show("You clicked on my new button")
    End Sub
End Class


Assign the Bitmap to the control"s Image property

Imports System
Imports System.Data
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Printing
Public Class MainClass
    
    Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)    
    End Sub
End Class

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles MyBase.Load
        Dim bm As New Bitmap( _
            picCanvas3.DisplayRectangle.Width, _
            picCanvas3.DisplayRectangle.Height)
        Dim gr As Graphics = Graphics.FromImage(bm)
        gr.DrawEllipse(Pens.Yellow, _
            picCanvas3.DisplayRectangle.X, _
            picCanvas3.DisplayRectangle.Y, _
            picCanvas3.DisplayRectangle.Width - 1, _
            picCanvas3.DisplayRectangle.Height - 1)
        picCanvas3.Image = bm
    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.picCanvas3 = New System.Windows.Forms.PictureBox
        CType(Me.picCanvas3, System.ruponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        "
        "picCanvas3
        "
        Me.picCanvas3.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.picCanvas3.Location = New System.Drawing.Point(360, 8)
        Me.picCanvas3.Name = "picCanvas3"
        Me.picCanvas3.Size = New System.Drawing.Size(168, 168)
        Me.picCanvas3.TabIndex = 3
        Me.picCanvas3.TabStop = False
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(536, 214)
        Me.Controls.Add(Me.picCanvas3)
        Me.Name = "Form1"
        Me.Text = "UsePictureBox"
        CType(Me.picCanvas3, System.ruponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents picCanvas3 As System.Windows.Forms.PictureBox
End Class


Component Client Rectangle and Display Rectangle

Imports System
Imports System.Data
Imports System.Windows.Forms
Imports System.Drawing
Public Class MainClass
    
    Shared Sub Main()
        Dim form1 As Form = New Form1
        Application.Run(form1)
    End Sub
End Class
Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Label1.Bounds = GroupBox1.ClientRectangle
        Label2.Bounds = GroupBox1.DisplayRectangle
    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.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.GroupBox2 = New System.Windows.Forms.GroupBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.Label4 = New System.Windows.Forms.Label
        Me.GroupBox1.SuspendLayout()
        Me.GroupBox2.SuspendLayout()
        Me.SuspendLayout()
        "
        "GroupBox1
        "
        Me.GroupBox1.Controls.Add(Me.Label2)
        Me.GroupBox1.Controls.Add(Me.Label1)
        Me.GroupBox1.Location = New System.Drawing.Point(8, 16)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(136, 128)
        Me.GroupBox1.TabIndex = 0
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "GroupBox1"
        "
        "GroupBox2
        "
        Me.GroupBox2.Controls.Add(Me.Label3)
        Me.GroupBox2.Controls.Add(Me.Label4)
        Me.GroupBox2.Location = New System.Drawing.Point(152, 16)
        Me.GroupBox2.Name = "GroupBox2"
        Me.GroupBox2.Size = New System.Drawing.Size(136, 128)
        Me.GroupBox2.TabIndex = 1
        Me.GroupBox2.TabStop = False
        Me.GroupBox2.Text = "GroupBox2"
        "
        "Label1
        "
        Me.Label1.BackColor = System.Drawing.Color.White
        Me.Label1.Location = New System.Drawing.Point(8, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(104, 16)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Label1"
        "
        "Label2
        "
        Me.Label2.BackColor = System.Drawing.Color.Gray
        Me.Label2.Location = New System.Drawing.Point(8, 48)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(104, 16)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "Label2"
        "
        "Label3
        "
        Me.Label3.BackColor = System.Drawing.Color.Gray
        Me.Label3.Location = New System.Drawing.Point(16, 24)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(104, 16)
        Me.Label3.TabIndex = 3
        Me.Label3.Text = "Label3"
        "
        "Label4
        "
        Me.Label4.BackColor = System.Drawing.Color.White
        Me.Label4.Location = New System.Drawing.Point(16, 48)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(104, 16)
        Me.Label4.TabIndex = 2
        Me.Label4.Text = "Label4"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(297, 153)
        Me.Controls.Add(Me.GroupBox2)
        Me.Controls.Add(Me.GroupBox1)
        Me.Name = "Form1"
        Me.Text = "DisplayRectangles"
        Me.GroupBox1.ResumeLayout(False)
        Me.GroupBox2.ResumeLayout(False)
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents GroupBox2 As System.Windows.Forms.GroupBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
End Class


Control Paint Demo

Imports System
Imports System.Collections
Imports System.Data
Imports System.Drawing
Imports System.Windows.Forms
Imports System.ruponentModel
Imports System.Drawing.Drawing2D
Imports System.IO
Public Class MainClass
    
    Shared Sub Main()
        Dim form1 As Form = New Form1
        Application.Run(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.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        "
        "ControlPaintExample
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Name = "ControlPaintExample"
        Me.Text = "ControlPaint Example"
    End Sub
#End Region
    Private Sub ControlPaintExample_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
        ControlPaint.DrawCheckBox(e.Graphics, New Rectangle(10, 10, 50, 50), ButtonState.Checked)
        ControlPaint.DrawCheckBox(e.Graphics, New Rectangle(70, 10, 30, 30), ButtonState.Normal)
        ControlPaint.DrawCheckBox(e.Graphics, New Rectangle(110, 10, 20, 20), ButtonState.Checked)
        ControlPaint.DrawButton(e.Graphics, New Rectangle(10, 80, 20, 20), ButtonState.Checked)
        ControlPaint.DrawButton(e.Graphics, New Rectangle(50, 80, 20, 20), ButtonState.Flat)
        ControlPaint.DrawButton(e.Graphics, New Rectangle(90, 80, 20, 20), ButtonState.Normal)
        ControlPaint.DrawFocusRectangle(e.Graphics, New Rectangle(130, 80, 20, 20))
        ControlPaint.DrawGrid(e.Graphics, New Rectangle(10, 120, 250, 50), New Size(5, 5), Color.Blue)
        ControlPaint.DrawScrollButton(e.Graphics, New Rectangle(10, 180, 20, 20), ScrollButton.Left, ButtonState.Normal)
        ControlPaint.DrawScrollButton(e.Graphics, New Rectangle(50, 180, 20, 20), ScrollButton.Max, ButtonState.Pushed)
        ControlPaint.DrawScrollButton(e.Graphics, New Rectangle(90, 180, 20, 20), ScrollButton.Up, ButtonState.Normal)
        ControlPaint.DrawMenuGlyph(e.Graphics, New Rectangle(10, 220, 20, 20), MenuGlyph.Arrow)
        ControlPaint.DrawMenuGlyph(e.Graphics, New Rectangle(50, 220, 20, 20), MenuGlyph.Checkmark)
        ControlPaint.DrawMenuGlyph(e.Graphics, New Rectangle(90, 220, 20, 20), MenuGlyph.Max)
    End Sub
End Class


Convert object to Control Object

Imports System
Imports System.Windows.Forms

Public Class MainClass
    
    Shared Sub Main()
        Dim form1 As Form = New Form1
        Application.Run(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 TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        "
        "TextBox1
        "
        Me.TextBox1.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.TextBox1.Location = New System.Drawing.Point(16, 60)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(156, 21)
        Me.TextBox1.TabIndex = 1
        Me.TextBox1.Text = "TextBox1"
        "
        "Label1
        "
        Me.Label1.FlatStyle = System.Windows.Forms.FlatStyle.System
        Me.Label1.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(16, 96)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(112, 24)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "Label1"
        "
        "Button1
        "
        Me.Button1.FlatStyle = System.Windows.Forms.FlatStyle.System
        Me.Button1.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Button1.Location = New System.Drawing.Point(16, 20)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 28)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Button1"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
        Me.ClientSize = New System.Drawing.Size(280, 186)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label1, Me.TextBox1, Me.Button1})
        Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Name = "Form1"
        Me.Text = "Control Medley"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub ctrlClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Click, TextBox1.Click, Label1.Click, Button1.Click
        Dim ctrl As Control = CType(sender, Control)
        MessageBox.Show("You clicked: " & ctrl.Name)
    End Sub
End Class


Display Names for All controls on a Frame

Imports System
Imports System.IO
Imports System.Windows.Forms
Public Class MainClass
   Shared Sub Main()
      Dim form1 As Form1 = new Form1()
      Application.Run(form1)
   End Sub 
End Class

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For Each ctl As Control In Me.Controls
            Console.WriteLine(ctl.Name)
        Next ctl
    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.lstDrives = New System.Windows.Forms.ListBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.lblAvailableFreeSpace = New System.Windows.Forms.Label
        Me.lblDriveFormat = New System.Windows.Forms.Label
        Me.Label4 = New System.Windows.Forms.Label
        Me.lblIsReady = New System.Windows.Forms.Label
        Me.Label6 = New System.Windows.Forms.Label
        Me.lblDriveType = New System.Windows.Forms.Label
        Me.Label8 = New System.Windows.Forms.Label
        Me.lblVolumeLabel = New System.Windows.Forms.Label
        Me.Label10 = New System.Windows.Forms.Label
        Me.lblTotalFreeSpace = New System.Windows.Forms.Label
        Me.Label12 = New System.Windows.Forms.Label
        Me.lblRootDirectory = New System.Windows.Forms.Label
        Me.Label14 = New System.Windows.Forms.Label
        Me.lblName = New System.Windows.Forms.Label
        Me.Label16 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        "
        "lstDrives
        "
        Me.lstDrives.Dock = System.Windows.Forms.DockStyle.Left
        Me.lstDrives.FormattingEnabled = True
        Me.lstDrives.Location = New System.Drawing.Point(0, 0)
        Me.lstDrives.Name = "lstDrives"
        Me.lstDrives.Size = New System.Drawing.Size(136, 199)
        Me.lstDrives.TabIndex = 0
        "
        "Label1
        "
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(144, 152)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(104, 13)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "Available Free Space"
        "
        "lblAvailableFreeSpace
        "
        Me.lblAvailableFreeSpace.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblAvailableFreeSpace.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblAvailableFreeSpace.Location = New System.Drawing.Point(256, 152)
        Me.lblAvailableFreeSpace.Name = "lblAvailableFreeSpace"
        Me.lblAvailableFreeSpace.Size = New System.Drawing.Size(152, 16)
        Me.lblAvailableFreeSpace.TabIndex = 2
        "
        "lblDriveFormat
        "
        Me.lblDriveFormat.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblDriveFormat.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblDriveFormat.Location = New System.Drawing.Point(256, 128)
        Me.lblDriveFormat.Name = "lblDriveFormat"
        Me.lblDriveFormat.Size = New System.Drawing.Size(152, 16)
        Me.lblDriveFormat.TabIndex = 4
        "
        "Label4
        "
        Me.Label4.AutoSize = True
        Me.Label4.Location = New System.Drawing.Point(144, 128)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(63, 13)
        Me.Label4.TabIndex = 3
        Me.Label4.Text = "Drive Format"
        "
        "lblIsReady
        "
        Me.lblIsReady.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblIsReady.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblIsReady.Location = New System.Drawing.Point(256, 32)
        Me.lblIsReady.Name = "lblIsReady"
        Me.lblIsReady.Size = New System.Drawing.Size(152, 16)
        Me.lblIsReady.TabIndex = 8
        "
        "Label6
        "
        Me.Label6.AutoSize = True
        Me.Label6.Location = New System.Drawing.Point(144, 32)
        Me.Label6.Name = "Label6"
        Me.Label6.Size = New System.Drawing.Size(45, 13)
        Me.Label6.TabIndex = 7
        Me.Label6.Text = "Is Ready"
        "
        "lblDriveType
        "
        Me.lblDriveType.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblDriveType.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblDriveType.Location = New System.Drawing.Point(256, 56)
        Me.lblDriveType.Name = "lblDriveType"
        Me.lblDriveType.Size = New System.Drawing.Size(152, 16)
        Me.lblDriveType.TabIndex = 6
        "
        "Label8
        "
        Me.Label8.AutoSize = True
        Me.Label8.Location = New System.Drawing.Point(144, 56)
        Me.Label8.Name = "Label8"
        Me.Label8.Size = New System.Drawing.Size(55, 13)
        Me.Label8.TabIndex = 5
        Me.Label8.Text = "Drive Type"
        "
        "lblVolumeLabel
        "
        Me.lblVolumeLabel.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblVolumeLabel.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblVolumeLabel.Location = New System.Drawing.Point(256, 104)
        Me.lblVolumeLabel.Name = "lblVolumeLabel"
        Me.lblVolumeLabel.Size = New System.Drawing.Size(152, 16)
        Me.lblVolumeLabel.TabIndex = 16
        "
        "Label10
        "
        Me.Label10.AutoSize = True
        Me.Label10.Location = New System.Drawing.Point(144, 104)
        Me.Label10.Name = "Label10"
        Me.Label10.Size = New System.Drawing.Size(67, 13)
        Me.Label10.TabIndex = 15
        Me.Label10.Text = "Volume Label"
        "
        "lblTotalFreeSpace
        "
        Me.lblTotalFreeSpace.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblTotalFreeSpace.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblTotalFreeSpace.Location = New System.Drawing.Point(256, 176)
        Me.lblTotalFreeSpace.Name = "lblTotalFreeSpace"
        Me.lblTotalFreeSpace.Size = New System.Drawing.Size(152, 16)
        Me.lblTotalFreeSpace.TabIndex = 14
        "
        "Label12
        "
        Me.Label12.AutoSize = True
        Me.Label12.Location = New System.Drawing.Point(144, 176)
        Me.Label12.Name = "Label12"
        Me.Label12.Size = New System.Drawing.Size(85, 13)
        Me.Label12.TabIndex = 13
        Me.Label12.Text = "Total Free Space"
        "
        "lblRootDirectory
        "
        Me.lblRootDirectory.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblRootDirectory.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblRootDirectory.Location = New System.Drawing.Point(256, 80)
        Me.lblRootDirectory.Name = "lblRootDirectory"
        Me.lblRootDirectory.Size = New System.Drawing.Size(152, 16)
        Me.lblRootDirectory.TabIndex = 12
        "
        "Label14
        "
        Me.Label14.AutoSize = True
        Me.Label14.Location = New System.Drawing.Point(144, 80)
        Me.Label14.Name = "Label14"
        Me.Label14.Size = New System.Drawing.Size(71, 13)
        Me.Label14.TabIndex = 11
        Me.Label14.Text = "Root Directory"
        "
        "lblName
        "
        Me.lblName.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblName.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblName.Location = New System.Drawing.Point(256, 8)
        Me.lblName.Name = "lblName"
        Me.lblName.Size = New System.Drawing.Size(152, 16)
        Me.lblName.TabIndex = 10
        "
        "Label16
        "
        Me.Label16.AutoSize = True
        Me.Label16.Location = New System.Drawing.Point(144, 8)
        Me.Label16.Name = "Label16"
        Me.Label16.Size = New System.Drawing.Size(31, 13)
        Me.Label16.TabIndex = 9
        Me.Label16.Text = "Name"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(411, 200)
        Me.Controls.Add(Me.lblVolumeLabel)
        Me.Controls.Add(Me.Label10)
        Me.Controls.Add(Me.lblTotalFreeSpace)
        Me.Controls.Add(Me.Label12)
        Me.Controls.Add(Me.lblRootDirectory)
        Me.Controls.Add(Me.Label14)
        Me.Controls.Add(Me.lblName)
        Me.Controls.Add(Me.Label16)
        Me.Controls.Add(Me.lblIsReady)
        Me.Controls.Add(Me.Label6)
        Me.Controls.Add(Me.lblDriveType)
        Me.Controls.Add(Me.Label8)
        Me.Controls.Add(Me.lblDriveFormat)
        Me.Controls.Add(Me.Label4)
        Me.Controls.Add(Me.lblAvailableFreeSpace)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.lstDrives)
        Me.Name = "Form1"
        Me.Text = "GetDriveInfo"
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents lstDrives As System.Windows.Forms.ListBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents lblAvailableFreeSpace As System.Windows.Forms.Label
    Friend WithEvents lblDriveFormat As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents lblIsReady As System.Windows.Forms.Label
    Friend WithEvents Label6 As System.Windows.Forms.Label
    Friend WithEvents lblDriveType As System.Windows.Forms.Label
    Friend WithEvents Label8 As System.Windows.Forms.Label
    Friend WithEvents lblVolumeLabel As System.Windows.Forms.Label
    Friend WithEvents Label10 As System.Windows.Forms.Label
    Friend WithEvents lblTotalFreeSpace As System.Windows.Forms.Label
    Friend WithEvents Label12 As System.Windows.Forms.Label
    Friend WithEvents lblRootDirectory As System.Windows.Forms.Label
    Friend WithEvents Label14 As System.Windows.Forms.Label
    Friend WithEvents lblName As System.Windows.Forms.Label
    Friend WithEvents Label16 As System.Windows.Forms.Label
End Class


Get Control Handle and check its value

Imports System
Imports System.Drawing
Imports System.Reflection
Imports System.Windows.Forms
public class MainClass
   Shared Sub Main()
      Dim form1 As Form = New Form1
      Application.Run(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 listBox1 As System.Windows.Forms.ListBox
    Friend WithEvents chkMulti As System.Windows.Forms.CheckBox
    Friend WithEvents lblWindow As System.Windows.Forms.Label
    "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.chkMulti = New System.Windows.Forms.CheckBox()
        Me.lblWindow = New System.Windows.Forms.Label()
        Me.listBox1 = New System.Windows.Forms.ListBox()
        Me.SuspendLayout()
        "
        "chkMulti
        "
        Me.chkMulti.Location = New System.Drawing.Point(192, 64)
        Me.chkMulti.Name = "chkMulti"
        Me.chkMulti.Size = New System.Drawing.Size(80, 16)
        Me.chkMulti.TabIndex = 1
        Me.chkMulti.Text = "MultiSelect"
        "
        "lblWindow
        "
        Me.lblWindow.Location = New System.Drawing.Point(32, 192)
        Me.lblWindow.Name = "lblWindow"
        Me.lblWindow.Size = New System.Drawing.Size(232, 16)
        Me.lblWindow.TabIndex = 2
        "
        "listBox1
        "
        Me.listBox1.Location = New System.Drawing.Point(24, 24)
        Me.listBox1.Name = "listBox1"
        Me.listBox1.Size = New System.Drawing.Size(144, 160)
        Me.listBox1.TabIndex = 0
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 216)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lblWindow, Me.chkMulti, Me.listBox1})
        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
        Dim x As Integer
        For x = 1 To 20
            listBox1().Items.Add("Entry # " & CStr(x))
        Next
        lblWindow().Text = "hWnd = " & listBox1().Handle.ToString
    End Sub
    Private Sub chkMulti_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkMulti.CheckedChanged
        
        If chkMulti().CheckState = CheckState.Checked Then
            listBox1().SelectionMode = SelectionMode.MultiExtended
        Else
            listBox1().SelectionMode = SelectionMode.One
        End If
        lblWindow().Text = "hWnd = " & listBox1().Handle.ToString
    End Sub
End Class


Get Labels from all Controls on a Form

Imports System
Imports System.IO
Imports System.Windows.Forms
Public Class MainClass
   Shared Sub Main()
      Dim form1 As Form1 = new Form1()
      Application.Run(form1)
   End Sub 
End Class

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For Each ctl As Control In Me.Controls
            If (ctl.Name.StartsWith("lbl")) AndAlso (TypeOf ctl Is Label) Then
                Dim lbl As Label = DirectCast(ctl, Label)
                lbl.Text = ""
            End If
        Next ctl
    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.lstDrives = New System.Windows.Forms.ListBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.lblAvailableFreeSpace = New System.Windows.Forms.Label
        Me.lblDriveFormat = New System.Windows.Forms.Label
        Me.Label4 = New System.Windows.Forms.Label
        Me.lblIsReady = New System.Windows.Forms.Label
        Me.Label6 = New System.Windows.Forms.Label
        Me.lblDriveType = New System.Windows.Forms.Label
        Me.Label8 = New System.Windows.Forms.Label
        Me.lblVolumeLabel = New System.Windows.Forms.Label
        Me.Label10 = New System.Windows.Forms.Label
        Me.lblTotalFreeSpace = New System.Windows.Forms.Label
        Me.Label12 = New System.Windows.Forms.Label
        Me.lblRootDirectory = New System.Windows.Forms.Label
        Me.Label14 = New System.Windows.Forms.Label
        Me.lblName = New System.Windows.Forms.Label
        Me.Label16 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        "
        "lstDrives
        "
        Me.lstDrives.Dock = System.Windows.Forms.DockStyle.Left
        Me.lstDrives.FormattingEnabled = True
        Me.lstDrives.Location = New System.Drawing.Point(0, 0)
        Me.lstDrives.Name = "lstDrives"
        Me.lstDrives.Size = New System.Drawing.Size(136, 199)
        Me.lstDrives.TabIndex = 0
        "
        "Label1
        "
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(144, 152)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(104, 13)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "Available Free Space"
        "
        "lblAvailableFreeSpace
        "
        Me.lblAvailableFreeSpace.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblAvailableFreeSpace.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblAvailableFreeSpace.Location = New System.Drawing.Point(256, 152)
        Me.lblAvailableFreeSpace.Name = "lblAvailableFreeSpace"
        Me.lblAvailableFreeSpace.Size = New System.Drawing.Size(152, 16)
        Me.lblAvailableFreeSpace.TabIndex = 2
        "
        "lblDriveFormat
        "
        Me.lblDriveFormat.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblDriveFormat.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblDriveFormat.Location = New System.Drawing.Point(256, 128)
        Me.lblDriveFormat.Name = "lblDriveFormat"
        Me.lblDriveFormat.Size = New System.Drawing.Size(152, 16)
        Me.lblDriveFormat.TabIndex = 4
        "
        "Label4
        "
        Me.Label4.AutoSize = True
        Me.Label4.Location = New System.Drawing.Point(144, 128)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(63, 13)
        Me.Label4.TabIndex = 3
        Me.Label4.Text = "Drive Format"
        "
        "lblIsReady
        "
        Me.lblIsReady.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblIsReady.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblIsReady.Location = New System.Drawing.Point(256, 32)
        Me.lblIsReady.Name = "lblIsReady"
        Me.lblIsReady.Size = New System.Drawing.Size(152, 16)
        Me.lblIsReady.TabIndex = 8
        "
        "Label6
        "
        Me.Label6.AutoSize = True
        Me.Label6.Location = New System.Drawing.Point(144, 32)
        Me.Label6.Name = "Label6"
        Me.Label6.Size = New System.Drawing.Size(45, 13)
        Me.Label6.TabIndex = 7
        Me.Label6.Text = "Is Ready"
        "
        "lblDriveType
        "
        Me.lblDriveType.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblDriveType.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblDriveType.Location = New System.Drawing.Point(256, 56)
        Me.lblDriveType.Name = "lblDriveType"
        Me.lblDriveType.Size = New System.Drawing.Size(152, 16)
        Me.lblDriveType.TabIndex = 6
        "
        "Label8
        "
        Me.Label8.AutoSize = True
        Me.Label8.Location = New System.Drawing.Point(144, 56)
        Me.Label8.Name = "Label8"
        Me.Label8.Size = New System.Drawing.Size(55, 13)
        Me.Label8.TabIndex = 5
        Me.Label8.Text = "Drive Type"
        "
        "lblVolumeLabel
        "
        Me.lblVolumeLabel.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblVolumeLabel.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblVolumeLabel.Location = New System.Drawing.Point(256, 104)
        Me.lblVolumeLabel.Name = "lblVolumeLabel"
        Me.lblVolumeLabel.Size = New System.Drawing.Size(152, 16)
        Me.lblVolumeLabel.TabIndex = 16
        "
        "Label10
        "
        Me.Label10.AutoSize = True
        Me.Label10.Location = New System.Drawing.Point(144, 104)
        Me.Label10.Name = "Label10"
        Me.Label10.Size = New System.Drawing.Size(67, 13)
        Me.Label10.TabIndex = 15
        Me.Label10.Text = "Volume Label"
        "
        "lblTotalFreeSpace
        "
        Me.lblTotalFreeSpace.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblTotalFreeSpace.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblTotalFreeSpace.Location = New System.Drawing.Point(256, 176)
        Me.lblTotalFreeSpace.Name = "lblTotalFreeSpace"
        Me.lblTotalFreeSpace.Size = New System.Drawing.Size(152, 16)
        Me.lblTotalFreeSpace.TabIndex = 14
        "
        "Label12
        "
        Me.Label12.AutoSize = True
        Me.Label12.Location = New System.Drawing.Point(144, 176)
        Me.Label12.Name = "Label12"
        Me.Label12.Size = New System.Drawing.Size(85, 13)
        Me.Label12.TabIndex = 13
        Me.Label12.Text = "Total Free Space"
        "
        "lblRootDirectory
        "
        Me.lblRootDirectory.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblRootDirectory.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblRootDirectory.Location = New System.Drawing.Point(256, 80)
        Me.lblRootDirectory.Name = "lblRootDirectory"
        Me.lblRootDirectory.Size = New System.Drawing.Size(152, 16)
        Me.lblRootDirectory.TabIndex = 12
        "
        "Label14
        "
        Me.Label14.AutoSize = True
        Me.Label14.Location = New System.Drawing.Point(144, 80)
        Me.Label14.Name = "Label14"
        Me.Label14.Size = New System.Drawing.Size(71, 13)
        Me.Label14.TabIndex = 11
        Me.Label14.Text = "Root Directory"
        "
        "lblName
        "
        Me.lblName.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.lblName.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblName.Location = New System.Drawing.Point(256, 8)
        Me.lblName.Name = "lblName"
        Me.lblName.Size = New System.Drawing.Size(152, 16)
        Me.lblName.TabIndex = 10
        "
        "Label16
        "
        Me.Label16.AutoSize = True
        Me.Label16.Location = New System.Drawing.Point(144, 8)
        Me.Label16.Name = "Label16"
        Me.Label16.Size = New System.Drawing.Size(31, 13)
        Me.Label16.TabIndex = 9
        Me.Label16.Text = "Name"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(411, 200)
        Me.Controls.Add(Me.lblVolumeLabel)
        Me.Controls.Add(Me.Label10)
        Me.Controls.Add(Me.lblTotalFreeSpace)
        Me.Controls.Add(Me.Label12)
        Me.Controls.Add(Me.lblRootDirectory)
        Me.Controls.Add(Me.Label14)
        Me.Controls.Add(Me.lblName)
        Me.Controls.Add(Me.Label16)
        Me.Controls.Add(Me.lblIsReady)
        Me.Controls.Add(Me.Label6)
        Me.Controls.Add(Me.lblDriveType)
        Me.Controls.Add(Me.Label8)
        Me.Controls.Add(Me.lblDriveFormat)
        Me.Controls.Add(Me.Label4)
        Me.Controls.Add(Me.lblAvailableFreeSpace)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.lstDrives)
        Me.Name = "Form1"
        Me.Text = "GetDriveInfo"
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents lstDrives As System.Windows.Forms.ListBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents lblAvailableFreeSpace As System.Windows.Forms.Label
    Friend WithEvents lblDriveFormat As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents lblIsReady As System.Windows.Forms.Label
    Friend WithEvents Label6 As System.Windows.Forms.Label
    Friend WithEvents lblDriveType As System.Windows.Forms.Label
    Friend WithEvents Label8 As System.Windows.Forms.Label
    Friend WithEvents lblVolumeLabel As System.Windows.Forms.Label
    Friend WithEvents Label10 As System.Windows.Forms.Label
    Friend WithEvents lblTotalFreeSpace As System.Windows.Forms.Label
    Friend WithEvents Label12 As System.Windows.Forms.Label
    Friend WithEvents lblRootDirectory As System.Windows.Forms.Label
    Friend WithEvents Label14 As System.Windows.Forms.Label
    Friend WithEvents lblName As System.Windows.Forms.Label
    Friend WithEvents Label16 As System.Windows.Forms.Label
End Class
Источник — «http://vbex.ru/index.php?title=VB.Net/GUI/Control&oldid=489»