System.Net.WebClient client=new WebClient(); 

byte[] page=client.DownloadData("http://www.google.com"); 

string content=System.Text.Encoding.UTF8.GetString(page); 

string hostName="www.nnn.net"; 

label1.Text="xxx"; 

int port=80; 

IPHostEntry ipInfo=Dns.GetHostByName(hostName); 

//取得IPAddress[] 

IPAddress[] ipAddr=ipInfo.AddressList; 

//得到ip 

IPAddress ip=ipAddr[0]; 

IPEndPoint hostEP=new IPEndPoint(ip,port); 

Socket socket=new Socket(AddressFamily.InterNetwork,
SocketType.Stream,ProtocolType.Tcp); 



socket.Connect(hostEP); 



string sendStr="GET "+"/tryst/default.asp"+" HTTP/1.1\r\nHost: " + 
hostName + "\r\nConnection: Close\r\n\r\n"; 

//创建bytes字节数组以转换发送串 

byte[] bytesSendStr=new byte[1024]; 

//将发送内容字符串转换成字节byte数组 

bytesSendStr=Encoding.ASCII.GetBytes(sendStr); 

socket.Send(bytesSendStr,bytesSendStr.Length,0); 

//声明接收返回内容的字符串 

string recvStr=""; 

//声明字节数组，一次接收数据的长度为1024字节 

byte[] recvBytes=new byte[1024]; 

//返回实际接收内容的字节数 

int bytes=0; 

//循环读取，直到接收完所有数据 

while(true) 

{ 

bytes=socket.Receive(recvBytes,recvBytes.Length,0); 

//读取完成后退出循环 

if(bytes<=0) 

break; 

//将读取的字节数转换为字符串 

recvStr+=Encoding.ASCII.GetString(recvBytes,0,bytes); 

}