C# ASP.NET Error message when non-numberic value in textbox

Posted by ilkdrl on Stack Overflow See other posts from Stack Overflow or by ilkdrl
Published on 2010-05-09T15:16:41Z Indexed on 2010/05/09 18:48 UTC
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If a user enters a non-numeric value into the textbox and presses button, I should see an "ERROR" message in a label.

How can I achieve this?

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