public ActionResult Comment(string returnUrl)
 {
     var autionId = int.Parse(Request["Id"]);
     if (User.Identity.IsAuthenticated)
     {
         ApplicationDbContext db = new ApplicationDbContext();
         var email = db.Users.Where(e => e.UserName == User.Identity.Name).FirstOrDefault().Email;
         var cmt = Request["Comment"];
         var proxy = new AuctionServiceClient("BasicHttpBinding_IAuctionService");
         proxy.Open();
         proxy.Comment(email, autionId, cmt);
         proxy.Close();
     }
     return Redirect(returnUrl);
 }