Now..the following statement is giving me error: Sys is undefined. var wRequest = new Sys.Net.WebRequest(); I have no clue whats been hapening, i have reinstalled latest ajax toolkit but it is still occuring.

Thanks,that just gave me an idea of creating an AJax listsearch extender kind of control in WPF. Cheers

No application defined windows or dialogs in partial trust. Windows Presentation Foundation Partial Trust Security[^] Mark Salsbery Microsoft MVP - Visual C++ :java:

See - I knew there was a smarter answer.... Christian Graus Driven to the arms of OSX by Vista. "! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums. I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

Always use SelectionMode="Extended" and not SelectionMode="Multiple" Try this and vote me :) Niladri Biswas