System.Net.WebSockets.WebSocketBase.KeepAliveTracker.DefaultKeepAliveTracker.StartTimer C# (CSharp) Method

                public override void StartTimer(WebSocketBase webSocket)
                {
                    Debug.Assert(webSocket != null, "'webSocket' MUST NOT be NULL.");
                    Debug.Assert(webSocket._keepAliveTracker != null,
                        "'webSocket._KeepAliveTracker' MUST NOT be NULL at this point.");
                    int keepAliveIntervalMilliseconds = (int)_keepAliveInterval.TotalMilliseconds;
                    Debug.Assert(keepAliveIntervalMilliseconds > 0, "'keepAliveIntervalMilliseconds' MUST be POSITIVE.");

                    // The correct pattern is to first initialize the Timer object, assign it to the member variable
                    // and only afterwards enable the Timer. This is required because the constructor, together with 
                    // the assignment are not guaranteed to be an atomic operation, which creates a race between the 
                    // assignment and the Timer callback.
                    _keepAliveTimer = new Timer(s_KeepAliveTimerElapsedCallback, webSocket, Timeout.Infinite,
                        Timeout.Infinite);

                    _keepAliveTimer.Change(keepAliveIntervalMilliseconds, Timeout.Infinite);
                }