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Whenever master page being used along a date picker, the selected date cant be picked on to the date text box. Hence, use the following 3rd party dll which will not discriminate date picker and the text box, which on selection of a date shall automatically fetches it on the text box

Reference: http://www.codeproject.com/useritems/ASPNET_JS_Calendar.asp

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Response.Redirect vs Server.Transfer

Response.Redirect can be used for both .aspx and html pages whereas Server.Transfer can be used only for .aspx pages.
Response.Redirect can be used to redirect a user to an external websites. Server.Transfer can be used only on sites running on the same server. You cannot use Server.Transfer to redirect the user to a page running on a different server.
Response.Redirect changes the url in the browser. So they can be bookmarked. Whereas Server.Transfer retains the original url in the browser. It just replaces the contents of the previous page with the new one.