AJAX - MODEL POPUP

http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/ModalPopup/ModalPopup.aspx

http://www.codeproject.com/Articles/34996/ASP-NET-AJAX-Control-Toolkit-ModalPopupExtender-Co

http://www.aspdotnet-suresh.com/2011/03/how-to-show-modalpopup-to-edit-gridview.html

http://msdn.microsoft.com/en-us/magazine/cc164247.aspx