public void HasEmail(FormCollection collection)
 {
     User user = new User();
     if (!string.IsNullOrWhiteSpace(collection["Email"]))
     {
         base.Response.ContentType = "application/text";
         if (user.HasUserByEmail(collection["Email"].Trim()))
         {
             base.Response.Write("true");
         }
         else
         {
             base.Response.Write("false");
         }
     }
 }