How to Produce an Error message when non-numeric value entered in ASP.NET 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 22:38 UTC
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Filed under:

c#

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.NET

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string

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textbox

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ASP.NET

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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