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
- 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
- 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
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