System.Net.Sockets.MultipleConnectAsync.StartConnectAsync C# (CSharp) Method

        public bool StartConnectAsync(SocketAsyncEventArgs args, DnsEndPoint endPoint)
        {
            lock (_lockObject)
            {
                if (endPoint.AddressFamily != AddressFamily.Unspecified &&
                    endPoint.AddressFamily != AddressFamily.InterNetwork &&
                    endPoint.AddressFamily != AddressFamily.InterNetworkV6)
                {
                    NetEventSource.Fail(this, $"Unexpected endpoint address family: {endPoint.AddressFamily}");
                }

                _userArgs = args;
                _endPoint = endPoint;

                // If Cancel() was called before we got the lock, it only set the state to Canceled: we need to
                // fail synchronously from here.  Once State.DnsQuery is set, the Cancel() call will handle calling AsyncFail.
                if (_state == State.Canceled)
                {
                    SyncFail(new SocketException((int)SocketError.OperationAborted));
                    return false;
                }

                if (_state != State.NotStarted)
                {
                    NetEventSource.Fail(this, "MultipleConnectAsync.StartConnectAsync(): Unexpected object state");
                }

                _state = State.DnsQuery;

                IAsyncResult result = DnsAPMExtensions.BeginGetHostAddresses(endPoint.Host, new AsyncCallback(DnsCallback), null);
                if (result.CompletedSynchronously)
                {
                    return DoDnsCallback(result, true);
                }
                else
                {
                    return true;
                }
            }
        }