public async Task RemoveConternAsync(string ConternID, string fanID)
        {
            Contern contern = GetContern(ConternID, fanID);

            _contern.Table.Remove(contern);
            await _contern._db.SaveChangesAsync();
        }
        public async Task CreateConternAsync(string ConternID, string fanID)
        {
            Contern contern = new Contern()
            {
                ID = $"{fanID}{ConternID}",
                ConternAccountID = ConternID,
                FansAccountID    = fanID
            };
            await _contern.Table.AddAsync(contern);

            await _contern._db.SaveChangesAsync();
        }