SignalR.DefaultSubscription.UpdateCursor C# (CSharp) Method

        private bool UpdateCursor(string key, ulong id)
        {
            lock (_lockObj)
            {
                // O(n), but small n and it's not common
                var index = _cursors.FindIndex(c => c.Key == key);
                if (index != -1)
                {
                    _cursors[index].Id = id;
                    return true;
                }

                return false;
            }
        }