C#的TCP通信

TCP是连接模型，如下：
服务器连接                     服务器断开
    ↓                                   ↑
服务器接收→服务器处理→服务器发送
    ↑                                   ↓
客户端发送←客户端处理←客户端接收
    ↑                                   ↓
客户端连接                     客户端断开
服务器代码如下：
//
ServerListen
TcpListener tcplistener
=
new
 TcpListener(
int
.Parse(txtPort.Text));
tcplistener.Start();
byte
[] btServerReceive
=
new
 
byte
[
256
];
string
 strServerReceive
=
string
.Empty;
//
Loop for Listen
while
(
true
)
{
 TcpClient tcp
=
tcplistener.AcceptTcpClient();
 NetworkStream ns
=
tcp.GetStream();
 
int
 intReceiveLength
=
 ns.Read(btServerReceive,
0
,btServerReceive.Length);
 strServerReceive
=
UnicodeEncoding.Unicode.GetString(btServerReceive,
0
,intReceiveLength);
 txtServerResult.AppendText(
"
ServerReceive:
"
 
+
 strServerReceive
+
"

"
);
 ns.Write(btServerReceive,
0
,btServerReceive.Length);
 txtServerResult.AppendText(
"
ServerSend:
"
&