what is code of "user already exists in database" using asp.net 3.5
Refer these
http://www.aspsnippets.com/Articles/Check-Username-Availability-in-ASP.Net-using-AJAX-PageMethods.aspx
http://www.aspsnippets.com/Articles/Check-UserName-Availability-in-ASP.Net-using-JQuery.aspx
http://www.aspsnippets.com/Articles/Check-whether-username-already-exists.aspx
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