System.Net.Sockets.SocketAsyncEventArgs.DoOperationSendTo C# (CSharp) Method

        internal SocketError DoOperationSendTo(SafeCloseSocket handle, out int bytesTransferred)
        {
            PrepareIOCPOperation();

            SocketError socketError;
            if (_buffer != null)
            {
                // Single buffer case.
                socketError = Interop.Winsock.WSASendTo(
                    handle,
                    ref _wsaBuffer,
                    1,
                    out bytesTransferred,
                    _socketFlags,
                    _ptrSocketAddressBuffer,
                    _socketAddress.Size,
                    _ptrNativeOverlapped,
                    IntPtr.Zero);
            }
            else
            {
                socketError = Interop.Winsock.WSASendTo(
                    handle,
                    _wsaBufferArray,
                    _wsaBufferArray.Length,
                    out bytesTransferred,
                    _socketFlags,
                    _ptrSocketAddressBuffer,
                    _socketAddress.Size,
                    _ptrNativeOverlapped,
                    IntPtr.Zero);
            }

            if (socketError == SocketError.SocketError)
            {
                socketError = SocketPal.GetLastSocketError();
            }

            return socketError;
        }

        public bool SendToAsync(SocketAsyncEventArgs e)
        {
            bool retval;

            if (s_loggingEnabled)
            {
                Logging.Enter(Logging.Sockets, this, "SendToAsync", "");
            }

            if (CleanedUp)
            {
                throw new ObjectDisposedException(GetType().FullName);
            }

            if (e == null)
            {
                throw new ArgumentNullException("e");
            }
            if (e.RemoteEndPoint == null)
            {
                throw new ArgumentNullException("RemoteEndPoint");
            }

            // Check permissions for connect and prepare SocketAddress
            EndPoint endPointSnapshot = e.RemoteEndPoint;
            e._socketAddress = CheckCacheRemote(ref endPointSnapshot, false);

            // Prepare for the native call.
            e.StartOperationCommon(this);
            e.StartOperationSendTo();

            // Make the native call.
            int bytesTransferred;
            SocketError socketError;

            // Wrap native methods with try/catch so event args object can be cleaned up.
            try
            {
                socketError = e.DoOperationSendTo(_handle, out bytesTransferred);
            }
            catch (Exception ex)
            {
                // Clear in-use flag on event args object. 
                e.Complete();
                throw ex;
            }

            // Handle completion when completion port is not posted.
            if (socketError != SocketError.Success && socketError != SocketError.IOPending)
            {
                e.FinishOperationSyncFailure(socketError, bytesTransferred, SocketFlags.None);
                retval = false;
            }
            else
            {
                retval = true;
            }

            if (s_loggingEnabled)
            {
                Logging.Exit(Logging.Sockets, this, "SendToAsync", retval);
            }

            return retval;
        }