Get Parameter from URL in C#

      string URLT = "localhost:2081/page.aspx?CaseID=662BB71D-CFF9-E711-90CD-00155DD3F14C";

            Uri uri = new Uri(URLT);

            var query = HttpUtility.ParseQueryString(uri.Query);

            var param1 = query.Get("CaseID");

            Guid CaseGUID = new Guid(param1);

SOURCE : mscrm.com