Request.UrlReferrer does not work in Internet Explorer

Hi , i have a problem in my asp application . Im trying to protect the path for my application using this code : 

Uri t = Request.UrlReferrer;             bool op = false;             if (t.ToString().StartsWith("https://rim-sistem.com") || (t.ToString().StartsWith("http://www.rim-sistem.com")))             {

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