Simple question visual studio 2010 c#.net textbox restrictions

Posted by ilkdrl on Stack Overflow See other posts from Stack Overflow or by ilkdrl
Published on 2010-05-08T00:09:26Z Indexed on 2010/05/08 0:18 UTC
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visual-studio-2010

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c#

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textbox

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restriction

if user entered "!" "?" "," in textbox and press button, this person see ERROR message in label. how can do that?

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