data entry into textbox

hi,
how do i allow only numbers or null allowed to be entered into a textbox?

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This will only allow numbers to be entered.

VB Code:

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If Not Char.IsNumber(e.KeyChar) Then
            e.Handled = True
        End If
    End Sub

You should also allow the backspace key to be pressed.

VB Code:

If Char.IsNumber(e.KeyChar) = False And Asc(e.KeyChar) <> 8 Then
      e.Handled = True
    End If