用C#电子邮件验证的类

答案：     /*
   电子邮件验证
   Windows2000 、Microsoft.NET Beta2、C#
   Made By Qingming Zhao
   Email: zqm2000@126.com
   2002,2,17
   csc /target:library ValideEmail.cs
  */
  using System;
  using System.Net.Sockets;
  using System.IO;
  using System.Text; 
  namespace BysWangZhan
  {
   class ValidateEmail //电子邮件验证
   {
   public string strEmail;
   public string strServer;
   public int intPort;
   string Email
   {
    set
    {
    strEmail=value;
    }
    get
    {
    return strEmail;
    }
   }
   string Server
   {
    set
    {
    strServer=value;
    }
    get
    {
    return strServer;
    }
   }
   int Port
   {
    set
    {
    intPort=value;
    }
    get
    {
    return intPort;
    }
   }
  /* static void Main(string[] args)
   {
    ValidateEmail MyTest=new ValidateEmail();
    MyTest.Email="zqm446@octopus.cdut.edu.cn";
    MyTest.Server="octopus.cdut.edu.cn";
    MyTest.Port=25; //默认端口是25 
    Console.WriteLine(MyTest.Exists());
   }
  */ public bool Exists()
   { 
    TcpClient tcpc = new TcpClient();
    tcpc.Connect(strServer,intPort);
    StreamReader sr1 = new StreamReader(tcpc.GetStream(),Encoding.Default);
    sr1.ReadLine();
    
    if(OperaStream(tcpc,"HELO "+strServer) != "250")
    {
    OperaStream(tcpc,"QUIT");
    return false;
    } 
    if(OperaStream(tcpc,"MAIL FROM: my@my.com") != "250")
    {
    OperaStream(tcpc,"QUIT");
    return false;
    }
    if(OperaStream(tcpc,"RCPT TO: "+strEmail) != "250")
    {
    OperaStream(tcpc,"QUIT");
    return false;
    }
    else
    {
    OperaStream(tcpc,"QUIT");
    return true;
    }
   } 
   static string OperaStream(TcpClient tcpc,string strCmd)
   {
    Stream TcpStream;
    strCmd = strCmd + "\r\n"; //加入换行符
    TcpStream = tcpc.GetStream();
    byte[] bWrite = Encoding.Default.GetBytes(strCmd.ToCharArray()); 
    TcpStream.Write(bWrite,0,bWrite.Length);
    StreamReader sr = new StreamReader(tcpc.GetStream(),Encoding.Default);
    string rl = sr.ReadLine();
    string sp = rl.Substring(0,3);
    return sp;
   } 
   }
  }
   

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