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Default ascii validation question


I have created the following code to only allow numeric values (an
decimal point) into TextBox1.

Private Sub Textbox1_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger)
Select Case KeyAscii
Case Asc("0") To Asc("99")
Case Asc(".")
If InStr(1, TextBox1.Text, ".") 0 Then
KeyAscii = 0
End If
Case Else
KeyAscii = 0
End Select
End Sub
The problem is this allow the entry of the decimal point alone. Thi
causes a '#VALUE' error in the target cell which in turn causes th
code to halt and bring up the debug form.
How do I modify this code so that if the user attempts to enter th
decimal point without a trailing number the value gets turned to Null

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