Send and Receive using SocketAsyncEventArgs

SendReceive.cs

private void StartSend(SocketAsyncEventArgs sendReceiveEventArgs)
{
    byte[] msgToSend = (byte[])sendReceiveEventArgs.UserToken;

    // If the number of bytes to send is larger than the buffer we need more than one operation
    if (msgToSend.Length <= SocketSettings.BufferSizeEach)
    {
        sendReceiveEventArgs.SetBuffer(msgToSend, 0, msgToSend.Length);
    }
    else
    {
        // Handle exception here for larger than buffer size instead of throwing an exception!
        throw new Exception("Handle case for larger than buffer size here!");
    }

    bool willRaiseEvent = sendReceiveEventArgs.AcceptSocket.SendAsync(sendReceiveEventArgs);
    // This will automatically call the IO_Completed process (ProcessSend) after completion.
}

private void ProcessSend(SocketAsyncEventArgs sendReceiveEventArgs)
{
    if (sendReceiveEventArgs.SocketError == SocketError.Success)
    {
        StartReceive(sendReceiveEventArgs);
    }
    else
    {
        CloseClientSocket(sendReceiveEventArgs);
    }
}

private void StartReceive(SocketAsyncEventArgs sendReceiveEventArgs)
{
    bool willRaiseEvent = sendReceiveEventArgs.AcceptSocket.ReceiveAsync(sendReceiveEventArgs);
}

private void ProcessReceive(SocketAsyncEventArgs sendReceiveEventArgs)
{
    if (sendReceiveEventArgs.SocketError != SocketError.Success)
    {
        CloseClientSocket(sendReceiveEventArgs);
    }
    else
    {
        if (sendReceiveEventArgs.BytesTransferred == 0)
        {
            CloseClientSocket(sendReceiveEventArgs);
        }
        else
        {
            byte[] msg = sendReceiveEventArgs.Buffer;

            byte[] response = MessageManager.ProcessReceivedMessage(msg);
            if (response != null)
            {
                sendReceiveEventArgs.UserToken = response;
                StartSend(sendReceiveEventArgs);
            }

            StartReceive(sendReceiveEventArgs);
        }
    }
}