public byte[] GetSendBytes()
{
List <byte> send = null;
lock (SendBuffer)
{
send = new List <byte>();
int length = SendBuffer.Count;
byte[] lengthB = BitConverter.GetBytes(length);
send.AddRange(lengthB);
byte[] body = SendBuffer.ToArray();
send.AddRange(body);
//
SendBuffer.Clear();
}
return(send.ToArray());
}