Imports System.Windows.Forms
public class NumericTextBoxDemo
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.ComponentModel.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 Button1 As System.Windows.Forms.Button
Friend WithEvents NumTextBox1 As NumTextBox
Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button()
Me.NumTextBox1 = New NumTextBox()
Me.SuspendLayout()
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(144, 120)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 1
Me.Button1.Text = "Do It!"
'
'NumTextBox1
'
Me.NumTextBox1.Location = New System.Drawing.Point(32, 56)
Me.NumTextBox1.Name = "NumTextBox1"
Me.NumTextBox1.TabIndex = 3
Me.NumTextBox1.Text = "NumTextBox1"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.NumTextBox1, Me.Button1})
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
End Class
Public Class NumTextBox
Inherits System.Windows.Forms.TextBox
#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
'UserControl1 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.ComponentModel.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.
Private Sub InitializeComponent()
'
'NumTextBox
'
End Sub
#End Region
Protected Overrides Sub OnLeave(ByVal e As System.EventArgs)
If Not IsNumeric(Me.Text) Then
MessageBox.Show("You must enter a numeric value!", _
"Please try again....", MessageBoxButtons.OK, _
MessageBoxIcon.Exclamation)
Me.Focus()
End If
MyBase.OnLeave(e)
End Sub
End Class