Have you tried JQuery UI Dialog? - Try below link, its very easy.
http://jqueryui.com/demos/dialog/#default

Below links might be helpful since you want to open jquery dialog from code behind. The blog post is more about how to do ajax with JQuery but
midnightprogrammer.net/.../...g-Jquery-Part-I.aspx

I believe the key to resolve your issue is to understand how to call javascript from code behind. You can refer below link, Instead of calling javascript function you can call Jquery function
www.devcurry.com/.../...-function-from-aspnet.html

If you find some good alternate approach, then Please let us know.

hi,
i have gone through that,it doesn't slove my issue.

i have a gridview in that buttonlink control is there,when i click on button link,it will retrieve the data from sql server and shows the details in a popup window.

till this working fine.but i need a popup window's corner should be rounded,not like a normal rectangle window.
i tried many jquery plugin,those are working in client side only......i need from sever side.

plz help me out.