Don't preserve viewstate when doing a Server.Transfer
The ASP.NET version of the Server.Transfer method accepts a second argument which, if true, causes the query string and all the form's fields to be transferred and made available to the destination page. However, when the destination page executes, the following error is likely to be generated:
The View State is invalid for this page and might be corrupted
The reason for this error is that the EnableViewStateMac attribute of the element of Web.config is set to true by default. This causes a message authentication check (MAC) on the view state of the page being posted back. The view state is held in the __VIEWSTATE hidden field, and the MAC fails because the MAC only checks each page. In other words, the view state of the page where Server.Transfer is called isn't valid on the destination page. This problem is discussed more estensively on the KB article mentioned at the bottom of this page.<
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