Maybe this for an active-x textbox named "Textbox1".
Code:
Private Sub TextBox1_Change()
If Not TextBox1.Text = "1" And Not TextBox1.Text = "2" And Not TextBox1.Text = "" Then
MsgBox "Only text permitted is a 1 or a 2 - try again"
TextBox1.Text = ""
Exit Sub
End If
End Sub
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