Hi, I have create some textboxes and had performed the input validation to block all other keys except from A to Z. However, now I cannot use the backspace key. How can I alter the code so that that key can be used again? The code is as follows:

Private Sub Textbox1(KeyAscii As Integer)

Dim StrValid as String

StrValid = "ABCD....Z"

If InStr(StrValid, Chr(KeyAscii)) = 0 Then
KeyAscii = 0
End If

End Sub