how to find textbox value from asp.net to javascript

Posted by Ramakrishna on Stack Overflow See other posts from Stack Overflow or by Ramakrishna
Published on 2010-06-15T07:12:22Z Indexed on 2010/06/15 7:22 UTC
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ASP.NET

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JavaScript

i have a textbox in asp.net form.... if i entered numbers not like 7 or 8 or 9, then script function should be araised with alert message.... how to achieve this.... that 7 or 8 or 9 are first digits in my texbox...

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