postback

http://www.xefteri.com/articles/show.cfm?id=18
How postback works in ASP.NET

http://msdn2.microsoft.com/library/ms178207(en-us,vs.80).aspx
How to: Add Client Script Dynamically to ASP.NET Web Pages

http://www.syncfusion.com/FAQ/aspnet/WEB_c15c.aspx
client side scripting