/// <summary>
/// Sends client protocol version and checks protocol version supported by server.
/// Overriden version sends additional information to make connection persistent.
/// </summary>
protected override void SendHandshake()
{
base.SendHandshake();
// send ad-hoc 'persistent connection' command
IBinaryWriter writer = FormatterFactory.CreateWriter(DataStream);
_persistCommandInfo.Serialize(writer);
// command body length
writer.Write(sizeof(int));
// enable persistent connection boolean flag
writer.Write(PERSIST_COMMAND_BODY);
DataStream.Flush();
}