Overview of user controls vs. custom controls

http://support.microsoft.com/kb/893667

http://msdn.microsoft.com/en-us/library/ms972975.aspx

http://msdn.microsoft.com/en-us/library/aa719735(vs.71).aspx

http://msdn.microsoft.com/en-us/library/aa720226(vs.71).aspx

Things to learn for me ...

1) The members or properties of user controls can be persisted using view state !
I don't know the above fact and was using sessions and Query Strings in URL ...