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how to check avaibility for user name as soon as text box lose his focus

Posted By:      Posted Date: October 05, 2010    Points: 0   Category :ASP.Net

hi friends,

i am developing web portal and i need to know, how do check user name is available or not in database as soon as textbox lose focus,

i have problem, how to go code behind page after textbox lose his focus.

thanx in advance. 

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