i have calculator project when i insert numeric key i work properly.But when i insert
a,b,c,d, etc. it give me error and application stop.send me code how can i stop writing
alphabetic key in text box.only use numeric

If you look in the C# code snippet section, you can find this snippet: http://www.daniweb.com/code/snippet217265.html
Same code I used in the zip file of a previous thread I sent you.
Success.

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