//通过clientSocket接收数据 
int receiveLength = 0;
int index = 0;
while (clientSocket.Available > 0)
{                                              //参数 数据缓存区  起始位置  数据长度  值的按位组合
receiveLength += clientSocket.Receive(result, index, clientSocket.ReceiveBufferSize, SocketFlags.None);
index += receiveLength;
}

return Encoding.GetEncoding("GB18030").GetString(result, 0, index);