public void CriarUsuario(Login login)
        {

            EnglishGo_Context db = new EnglishGo_Context();
            db.Login.Add(login);
            db.SaveChanges();

        }
 public bool Validar(ref Login login)
 {
     using (EnglishGo_Context db = new EnglishGo_Context())
     {
         
         string user = login.User;
         string password = login.Password;
         var contas = db.Login.Where(log => log.User == user && log.Password == password);
         if (contas.Count() > 0)
         {
             login = contas.First();
             return true;
         }
         else
             return false;
     }
 }