VB Type Mismatch Error in Textbox

I have a TextBox that should only hold numeric values because there is a calculation eg(TextBox.Text = integer + integer) but if the user enters letters of course i get a type mismatch error because you cant add letters to numbers.

So i want some sort of error checking to check if letters have been enetered into the textbox?

cheers

Welburn1010
welburn1010Asked:
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Mikal613Commented:
if not isnumeric(textbox.text) then
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Mikal613Commented:
if not isnumeric(trim(textbox.text)) then
 msgbox "Sorry!!"
End if
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hongjunCommented:
one way is to restrict to only integers input

Private Sub Text1_KeyPress(KeyAscii As Integer)
    If KeyAscii < 48 Or KeyAscii > 57 Then
        KeyAscii = 0
    End If
End Sub



hongjun
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Mike TomlinsonMiddle School Assistant TeacherCommented:
If you want only integers in your textbox you can also use the SetWindowLong API.  There is an example here:

http://www.galahtech.com/forums/index.php?showtopic=3080
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Mike TomlinsonMiddle School Assistant TeacherCommented:
There is a more indepth article on how the API works here:

http://www.mvps.org/vbnet/index.html?http://www.mvps.org/vbnet/api/_consts/constse.htm
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