VB.NET中让Textbox只能输入数字

Public Class Form1
Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

Public Sub New()
MyBase.New()

'该调用是 Windows 窗体设计器所必需的。
InitializeComponent()

'在 InitializeComponent() 调用之后添加任何初始化

End Sub

'窗体重写 dispose 以清理组件列表。
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

'Windows 窗体设计器所必需的
Private components As System.ComponentModel.IContainer

'注意: 以下过程是 Windows 窗体设计器所必需的
'可以使用 Windows 窗体设计器修改此过程。
'不要使用代码编辑器修改它。
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox

 1<system.diagnostics.debuggerstepthrough()> Private Sub InitializeComponent()   
 2Me.TextBox1 = New System.Windows.Forms.TextBox   
 3Me.SuspendLayout()   
 4'   
 5'TextBox1   
 6'   
 7Me.TextBox1.Location = New System.Drawing.Point(112, 96)   
 8Me.TextBox1.Name = "TextBox1"   
 9Me.TextBox1.TabIndex = 0   
10Me.TextBox1.Text = ""   
11'   
12'Form1   
13'   
14Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)   
15Me.ClientSize = New System.Drawing.Size(292, 266)   
16Me.Controls.Add(Me.TextBox1)   
17Me.Name = "Form1"   
18Me.Text = "Form1"   
19Me.ResumeLayout(False) 
20
21End Sub 
22
23#End Region   
24Dim str As String = "" 
25
26Private Sub TextBox1_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyUp   
27If (e.KeyValue &gt; 47 And e.KeyValue &lt; 58) Or (e.KeyValue &gt; 95 And e.KeyValue &lt; 106) Or (e.KeyValue = 8) Or (e.KeyValue = 45) Or (e.KeyValue = 46) Then   
28str = TextBox1.Text   
29Else   
30TextBox1.Text = str   
31TextBox1.Focus()   
32End If   
33End Sub   
34End Class</system.diagnostics.debuggerstepthrough()>