Hi Najid,
I would suggest that you take a look at the following posts where it is explained how you can pass query string parameters:
http://weblogs.asp.net/gurusarkar/archive/2010/09/23/pass-querystring-parameter-with-navigaterurl-in-hyperlink-inside-a-gridview.aspx
http://www.telerik.com/community/forums/aspnet-ajax/window/how-to-pass-two-parameters.aspx
http://www.telerik.com/community/forums/aspnet-ajax/window/a-simple-radwindow-example.aspx
All the best,
Kate
the Telerik team
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