Testing if URL and querystring is valid

Posted by Scott on Stack Overflow See other posts from Stack Overflow or by Scott
Published on 2010-05-13T18:20:50Z Indexed on 2010/05/13 18:24 UTC
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ASP.NET

What is the best way to test if a url & querystring is valid? For example, after a login redirect I want to make sure the target url is valid. If not, go to a default page.

We seem to have a problem with the querystring, starting with "ReturnUrl=", being duplicated and that throws an exception. We'd rather have it go to a default page.

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