VB.Net Tutorial/GUI/Control Event

A simple event handler

Imports System.Windows.Forms
public class GenericEventHandler
   public Shared Sub Main
        Application.Run(New FrmSimple)
   End Sub
End class

Public Class FrmSimple
   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 " New
   " 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 " Dispose
   Friend WithEvents lblOutput As System.Windows.Forms.Label
   " 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.lblOutput = New System.Windows.Forms.Label()
      Me.SuspendLayout()
      "
      "lblOutput
      "
      Me.lblOutput.Location = New System.Drawing.Point(16, 16)
      Me.lblOutput.Name = "lblOutput"
      Me.lblOutput.Size = New System.Drawing.Size(152, 80)
      Me.lblOutput.TabIndex = 0
      Me.lblOutput.Text = "Click Me!"
      Me.lblOutput.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
      "
      "FrmSimple
      "
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(176, 101)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lblOutput})
      Me.Name = "FrmSimple"
      Me.Text = "SimpleEventExample"
      Me.ResumeLayout(False)
   End Sub
#End Region
   Private Sub lblOutput_Click(ByVal sender As Object, _
      ByVal e As System.EventArgs) Handles lblOutput.Click
      MessageBox.Show("Label was clicked")
   End Sub 
End Class

Handle multiple event handlers from different controls

Imports System.Windows.Forms
public class HandleMultipleEventsFromDifferentControls
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub MultipleEvents(ByVal sender As Object, _
            ByVal e As System.EventArgs) Handles _
            TextBox1.Enter, TextBox2.Enter, TextBox3.Enter, _
            TextBox1.TextChanged, TextBox2.TextChanged, TextBox3.TextChanged
        
        Dim activeControl As TextBox
        activeControl = CType(sender, TextBox)
        ShowInfo.Text = "TextField #" & _
            activeControl.Name & _
            ", " & activeControl.Text.Length & " character(s)"
    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.TextBox1 = New System.Windows.Forms.TextBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.Label3 = New System.Windows.Forms.Label
        Me.TextBox3 = New System.Windows.Forms.TextBox
        Me.Label4 = New System.Windows.Forms.Label
        Me.ShowInfo = New System.Windows.Forms.Label
        Me.SuspendLayout()
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(120, 8)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(160, 20)
        Me.TextBox1.TabIndex = 1
        "
        "Label1
        "
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(8, 10)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(93, 13)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Text Box Field #1:"
        "
        "Label2
        "
        Me.Label2.AutoSize = True
        Me.Label2.Location = New System.Drawing.Point(8, 42)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(93, 13)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "Text Box Field #2:"
        "
        "TextBox2
        "
        Me.TextBox2.Location = New System.Drawing.Point(120, 40)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.Size = New System.Drawing.Size(160, 20)
        Me.TextBox2.TabIndex = 3
        "
        "Label3
        "
        Me.Label3.AutoSize = True
        Me.Label3.Location = New System.Drawing.Point(9, 72)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(93, 13)
        Me.Label3.TabIndex = 4
        Me.Label3.Text = "Text Box Field #3:"
        "
        "TextBox3
        "
        Me.TextBox3.Location = New System.Drawing.Point(121, 70)
        Me.TextBox3.Name = "TextBox3"
        Me.TextBox3.Size = New System.Drawing.Size(159, 20)
        Me.TextBox3.TabIndex = 5
        "
        "Label4
        "
        Me.Label4.AutoSize = True
        Me.Label4.Location = New System.Drawing.Point(8, 104)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(62, 13)
        Me.Label4.TabIndex = 6
        Me.Label4.Text = "Information:"
        "
        "ShowInfo
        "
        Me.ShowInfo.AutoSize = True
        Me.ShowInfo.Location = New System.Drawing.Point(120, 104)
        Me.ShowInfo.Name = "ShowInfo"
        Me.ShowInfo.Size = New System.Drawing.Size(27, 13)
        Me.ShowInfo.TabIndex = 7
        Me.ShowInfo.Text = "N/A"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(320, 136)
        Me.Controls.Add(Me.ShowInfo)
        Me.Controls.Add(Me.Label4)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.TextBox3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.TextBox1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.MaximizeBox = False
        Me.Name = "Form1"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "Sharing Control Logic"
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents ShowInfo As System.Windows.Forms.Label
End Class