asp.net - How i can check user availability without postbacking of page to server? -


i have made user signup form in asp.net. want check user availability user table made in sqlserver without postbacking of page server. checking user availability when focus out textbox or during text change.

please provide me code or source in vb language if possible.

from client-side, option ajax web services using javascript in front end , asmx in backend: http://dotnetslackers.com/columns/ajax/aspnetajaxwebservice.aspx, or using pagemethods approach: http://aspalliance.com/1922

hth.


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