Hmm. Ones and Zeros

[Amon Ra]

As long as my program runs, how do i restrict the characters to be entered into a txt box only to 1 and 0(for binaries)?api?

Try this:

Private Sub Text1_KeyPress(KeyAscii As Integer)
    Select Case KeyAscii
        Case vbKey0
            Exit Sub
        Case vbKey1
            Exit Sub
        Case vbKeyBack
            Exit Sub
        Case Else
            KeyAscii = 0
    End Select
End Sub

[Amon Ra]

Great! thankx. btw, why does it say exit sub if it is 1 or 0?

[Lord Orwell]

it doesn't have to in his example. You could leave the case statements blank. The important one is the case else.