VB.Net by API/System.Windows.Forms/KeyPressEventArgs

KeyPressEventArgs.KeyChar

<source lang="vbnet"> 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

1. 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 TextBox1 As System.Windows.Forms.TextBox
   Friend WithEvents Label1 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.TextBox1 = New System.Windows.Forms.TextBox()
       Me.Label1 = New System.Windows.Forms.Label()
       Me.SuspendLayout()
       "
       "TextBox1
       "
       Me.TextBox1.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
       Me.TextBox1.Location = New System.Drawing.Point(48, 104)
       Me.TextBox1.Name = "TextBox1"
       Me.TextBox1.Size = New System.Drawing.Size(192, 27)
       Me.TextBox1.TabIndex = 1
       Me.TextBox1.Text = ""
       "
       "Label1
       "
       Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
       Me.Label1.Location = New System.Drawing.Point(24, 24)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(232, 48)
       Me.Label1.TabIndex = 2
       Me.Label1.Text = "Type somthing"
       "
       "Form1
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
       Me.ClientSize = New System.Drawing.Size(292, 268)
       Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label1, Me.TextBox1})
       Me.Name = "Form1"
       Me.Text = "Key Event Examples"
       Me.ResumeLayout(False)
   End Sub

1. End Region

   Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
   End Sub
   Private Sub TextBox1_KeyPress(ByVal sender As Object, _
           ByVal e As System.Windows.Forms.KeyPressEventArgs) _
           Handles TextBox1.KeyPress
       If e.KeyChar < "0" Or e.KeyChar > "9" Then
           MessageBox.Show("only digits allowed")
           e.Handled = True
       End If
   End Sub
   

End Class

 </source>