public IHttpActionResult Register(user newUser)
 {
     try
     {
         // user newUser = new user();
         if (ModelState.IsValid)
         {
             if (bllService.RegisterUser(newUser))
             {
                 return(Ok());
             }
             else
             {
                 return(BadRequest("username exists"));
             }
         }
         else
         {
             return(BadRequest("Invalid modelstate"));
         }
     }
     catch (Exception)
     {
         throw;
     }
 }