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System.Net.Sockets.TcpClient tcpC;
System.Net.Sockets.NetworkStream netStream;
string SendCommand(string sToSend){
 byte[] bData=Encoding.GetEncoding(936).GetBytes(sToSend+Environment.NewLine);
 netStream.Write(bData,0,bData.Length);
 return GetResponse();
}

string GetResponse(){
  byte[] bData=new byte[tcpC.ReceiveBufferSize];
  int iRec=netStream.Read(bData, 0, bData.Length);
  return Encoding.GetEncoding(936).GetString(bData,0,iRec);
}
string ReadMail(string ps,string un,string pw){
 tcpC=new System.Net.Sockets.TcpClient(ps,110);
 netStream = tcpC.GetStream();
 string strResponse=GetResponse();
 string strNL=Environment.NewLine;
 string strEnd=strNL+"."+strNL+"+OK "+strNL;
 SendCommand("user "+un);
 SendCommand("pass "+pw);
 strResponse=SendCommand("stat");
 int iCount=Int32.Parse(strResponse.Split(' ')[1]);
 Response.Write(iCount + " Messages");
 for(int i=1;i<iCount;i++)strResponse+=SendCommand("top "+i+" 0");
 strResponse+=SendCommand("QUIT");
 while(!strResponse.EndsWith(strEnd))strResponse+=GetResponse();
 tcpC.Close();
 return strResponse;
}

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 ReadMail(pop3Server,username,password)

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