public User GetUser(string userName, string password)
 {
     using (var db = new BackgammonContext(/*connectionString*/))
     {
         var user = db.Users.Find(userName);
         return(user?.Password == password ? user : null);
     }
 }
 public bool AddUser(string userName, string password)
 {
     using (var db = new BackgammonContext(/*connectionString*/))
     {
         if (db.Users.Any(u => u.UserName == userName))
         {
             return(false);
         }
         db.Users.Add(new User
         {
             UserName = userName,
             Password = password
         });
         db.SaveChanges();
         return(true);
     }
 }
 public User GetUser(string userName)
 {
     using (var db = new BackgammonContext(/*connectionStrin*/))
         return(db.Users.Find(userName));
 }