namespace Lion.Web.Mail
{
 /* 
 Create By lion 
 2004-04-23 19:00  

 Support C# Framework Beta 2 
 */ 
 #region AspNetPager Server Control

 /// <summary>
 /// 邮件可以通过 Microsoft Windows 2000 中内置的 SMTP 邮件服务或任意 SMTP 服务器来传送
 /// </summary>
 public class SmtpMail
 {

  private string enter="\r\n";

  /// <summary>
  /// 设定语言代码，默认设定为GB2312，如不需要可设置为""
  /// </summary>
  private string _charset="GB2312";

  /// <summary>
  /// 发件人地址
  /// </summary>
  private string _from="";

  /// <summary>
  /// 发件人姓名
  /// </summary>
  private string _fromName="";

  /// <summary>
  /// 回复邮件地址
  /// </summary>
  ///public string ReplyTo="";

  /// <summary>
  /// 收件人姓名
  /// </summary>
  private string _recipientName="";

  /// <summary>
  /// 收件人列表
  /// </summary>
  private Hashtable Recipient=new Hashtable();

  /// <summary>
  /// 邮件服务器域名
  /// </summary>
  private string mailserver="";

  /// <summary>
  /// 邮件服务器端口号
  /// </summary>
  private int mailserverport=25;

  /// <summary>
  /// SMTP认证时使用的用户名
  /// </summary>
  private string username="";

  /// <summary>
  /// SMTP认证时使用的密码
  /// </summary>
  private string password="";

  /// <summary>
  /// 是否需要SMTP验证
  /// </summary> 
  private bool ESmtp=false;

  /// <summary>
  /// 是否Html邮件
  /// </summary> 
  private bool _html=false;

  /// <summary>
  /// 邮件附件列表
  /// </summary>
  private IList Attachments;

  /// <summary>
  /// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5"
  /// </summary>
  private string priority="Normal";

  /// <summary>
  /// 邮件主题
  /// </summary> 
  private string _subject;

  /// <summary>
  /// 邮件正文
  /// </summary> 
  private string _body;
       
  /// <summary>
  /// 密送收件人列表
  /// </summary>
  ///private Hashtable RecipientBCC=new Hashtable();

  /// <summary>
  /// 收件人数量
  /// </summary>
  private int RecipientNum=0;

  /// <summary>
  /// 最多收件人数量
  /// </summary>
  private int recipientmaxnum=5;

  /// <summary>
  /// 密件收件人数量
  /// </summary>
  ///private int RecipientBCCNum=0;

  /// <summary>
  /// 错误消息反馈
  /// </summary>
  private string errmsg;

  /// <summary>
  /// TcpClient对象，用于连接服务器
  /// </summary>
  private TcpClient tc;

  /// <summary>
  /// NetworkStream对象
  /// </summary>
  private NetworkStream ns;
 
  /// <summary>
  /// 服务器交互记录
  /// </summary>
  private string logs="";

  /// <summary>
  /// SMTP错误代码哈希表
  /// </summary>
  private Hashtable ErrCodeHT = new Hashtable();

  /// <summary>
  /// SMTP正确代码哈希表
  /// </summary>
  private Hashtable RightCodeHT = new Hashtable();
 

  /// <summary>
  /// 初始化 <see cref="Lion.Web.Mail.SmtpMail"/> 类的新实例
  /// </summary>
  public SmtpMail()
  {
   Attachments = new System.Collections.ArrayList();
  }

  #region Properties

  /// <summary>
  /// 邮件主题
  /// </summary>
  public string Subject
  {
   get
   {
    return this._subject;
   }
   set
   {
    this._subject = value;
   }
  }

  /// <summary>
  /// 邮件正文
  /// </summary>
  public string Body
  {
   get
   {
    return this._body;
   }
   set
   {
    this._body = value;
   }
  }

 
  /// <summary>
  /// 发件人地址
  /// </summary>
  public string From
  {
   get
   {
    return _from;
   }
   set
   {
    this._from = value;
   }
  }

  /// <summary>
  /// 设定语言代码，默认设定为GB2312，如不需要可设置为""
  /// </summary>
  public string Charset
  {
   get
   {
    return this._charset;
   }
   set
   {
    this._charset = value;
   }
  }

  /// <summary>
  /// 发件人姓名
  /// </summary>
  public string FromName
  {
   get
   {
    return this._fromName;
   }
   set
   {
    this._fromName = value;
   }
  }

  /// <summary>
  /// 收件人姓名
  /// </summary>
  public string RecipientName
  {
   get
   {
    return this._recipientName;
   }
   set
   {
    this._recipientName = value;
   }
  }
 
  /// <summary>
  /// 邮件服务器域名和验证信息
  /// 形如："user:pass@www.server.com:25"，也可省略次要信息。如"user:pass@www.server.com"或"www.server.com"
  /// </summary>
  public string MailDomain
  {
   set
   {
    string maidomain=value.Trim();
    int tempint;

    if(maidomain!="")
    {
     tempint=maidomain.IndexOf("@");
     if(tempint!=-1)
     {
      string str=maidomain.Substring(0,tempint);
      MailServerUserName=str.Substring(0,str.IndexOf(":"));
      MailServerPassWord=str.Substring(str.IndexOf(":")+1,str.Length-str.IndexOf

(":")-1);
      maidomain=maidomain.Substring(tempint+1,maidomain.Length-tempint-1);
     }

     tempint=maidomain.IndexOf(":");
     if(tempint!=-1)
     {
      mailserver=maidomain.Substring(0,tempint);
      mailserverport=System.Convert.ToInt32(maidomain.Substring

(tempint+1,maidomain.Length-tempint-1));
     }
     else
     {
      mailserver=maidomain;

     }

    
    }

   }
  }

  /// <summary>
  /// 邮件服务器端口号
  /// </summary>
  public int MailDomainPort
  {
   set
   {
    mailserverport=value;
   }
  }

  /// <summary>
  /// SMTP认证时使用的用户名
  /// </summary>
  public string MailServerUserName
  {
   set
   {
    if(value.Trim()!="")
    {
     username=value.Trim();
     ESmtp=true;
    }
    else
    {
     username="";
     ESmtp=false;
    }
   }
  }

  /// <summary>
  /// SMTP认证时使用的密码
  /// </summary>
  public string MailServerPassWord
  {
   set
   {
    password=value;
   }
  }

  /// <summary>
  /// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5"
  /// </summary>
  public string Priority
  {
   set
   {
    switch(value.ToLower())
    {
     case "high":
      priority="High";
      break;

     case "1":
      priority="High";
      break;

     case "normal":
      priority="Normal";
      break;

     case "3":
      priority="Normal";
      break;

     case "low":
      priority="Low";
      break;

     case "5":
      priority="Low";
      break;

     default:
      priority="Normal";
      break;
    }
   }
  }

  /// <summary>
  ///  是否Html邮件
  /// </summary>
  public bool Html
  {
   get
   {
    return this._html;
   }
   set
   {
    this._html = value;
   }
  }

  /// <summary>
  /// 错误消息反馈
  /// </summary> 
  public string ErrorMessage
  {
   get
   {
    return errmsg;
   }
  }

  /// <summary>
  /// 服务器交互记录，如发现本组件不能使用的SMTP服务器，请将出错时的Logs发给我（lion-a@sohu.com），我将尽快查明

原因。
  /// </summary>
  public string Logs
  {
   get
   {
    return logs;
   }
  }

  /// <summary>
  /// 最多收件人数量
  /// </summary>
  public int RecipientMaxNum
  {
   set
   {
    recipientmaxnum = value;
   }
  }

 
  #endregion

  #region Methods

  /// <summary>
  /// 添加邮件附件
  /// </summary>
  /// <param name="FilePath">附件绝对路径</param>
  public void AddAttachment(params string[] FilePath)
  {
   if(FilePath==null)
   {
    throw(new ArgumentNullException("FilePath"));
   }
   for(int i=0;i<FilePath.Length;i++)
   {
    Attachments.Add(FilePath[i]);
   }
  }
 
  /// <summary>
  /// 添加一组收件人（不超过recipientmaxnum个），参数为字符串数组
  /// </summary>
  /// <param name="Recipients">保存有收件人地址的字符串数组（不超过recipientmaxnum个）</param>
  public bool AddRecipient(params string[] Recipients)
  {
   if(Recipient==null)
   {
    Dispose();
    throw(new ArgumentNullException("Recipients"));
   }
   for(int i=0;i<Recipients.Length;i++)
   {
    string recipient = Recipients[i].Trim();
    if(recipient==String.Empty)
    {
     Dispose();
     throw(new ArgumentNullException("Recipients["+ i +"]"));
    }
    if(recipient.IndexOf("@")==-1)
    {
     Dispose();
     throw(new ArgumentException("Recipients.IndexOf(\"@\")==-1","Recipients"));
    }
    if(!AddRecipient(recipient))
    {
     return false;
    }
   }
   return true;
  }

  /// <summary>
  /// 发送邮件方法，所有参数均通过属性设置。
  /// </summary>
  public bool Send()
  {
   if(mailserver.Trim()=="")
   {
    throw(new ArgumentNullException("Recipient","必须指定SMTP服务器"));
   }

   return SendEmail();
  
  }

  /// <summary>
  /// 发送邮件方法
  /// </summary>
  /// <param name="smtpserver">smtp服务器信息，如"username:password@www.smtpserver.com:25"，也可去掉部分次要信

息，如"www.smtpserver.com"</param>
  public bool Send(string smtpserver)
  {  
   MailDomain=smtpserver;
   return Send();
  }

  /// <summary>
  /// 发送邮件方法
  /// </summary>
  /// <param name="smtpserver">smtp服务器信息，如"username:password@www.smtpserver.com:25"，也可去掉部分次要信

息，如"www.smtpserver.com"</param>
  /// <param name="from">发件人mail地址</param>
  /// <param name="fromname">发件人姓名</param>
  /// <param name="to">收件人地址</param>
  /// <param name="toname">收件人姓名</param>
  /// <param name="html">是否HTML邮件</param>
  /// <param name="subject">邮件主题</param>
  /// <param name="body">邮件正文</param>
  public bool Send(string smtpserver,string from,string fromname,string to,string toname,bool html,string

subject,string body)
  {
   MailDomain=smtpserver;
   From=from;
   FromName=fromname;
   AddRecipient(to);
   RecipientName=toname;
   Html=html;
   Subject=subject;
   Body=body;
   return Send();
  }
 

  #endregion

  #region Private Helper Functions

  /// <summary>
  /// 添加一个收件人
  /// </summary>
  /// <param name="Recipients">收件人地址</param>
  private bool AddRecipient(string Recipients)
  {
   if(RecipientNum<recipientmaxnum)
   {
    Recipient.Add(RecipientNum,Recipients);
    RecipientNum++;   
    return true;
   }
   else
   {
    Dispose();
    throw(new ArgumentOutOfRangeException("Recipients","收件人过多不可多于 "+ recipientmaxnum  +"

个"));
   }
  }

  void Dispose()
  {
   if(ns!=null)ns.Close();
   if(tc!=null)tc.Close();
  }

  /// <summary>
  /// SMTP回应代码哈希表
  /// </summary>
  private void SMTPCodeAdd()
  {
   ErrCodeHT.Add("500","邮箱地址错误");
   ErrCodeHT.Add("501","参数格式错误");
   ErrCodeHT.Add("502","命令不可实现");
   ErrCodeHT.Add("503","服务器需要SMTP验证");
   ErrCodeHT.Add("504","命令参数不可实现");
   ErrCodeHT.Add("421","服务未就绪，关闭传输信道");
   ErrCodeHT.Add("450","要求的邮件操作未完成，邮箱不可用（例如，邮箱忙）");
   ErrCodeHT.Add("550","要求的邮件操作未完成，邮箱不可用（例如，邮箱未找到，或不可访问）");
   ErrCodeHT.Add("451","放弃要求的操作；处理过程中出错");
   ErrCodeHT.Add("551","用户非本地，请尝试<forward-path>");
   ErrCodeHT.Add("452","系统存储不足，要求的操作未执行");
   ErrCodeHT.Add("552","过量的存储分配，要求的操作未执行");
   ErrCodeHT.Add("553","邮箱名不可用，要求的操作未执行（例如邮箱格式错误）");
   ErrCodeHT.Add("432","需要一个密码转换");
   ErrCodeHT.Add("534","认证机制过于简单");
   ErrCodeHT.Add("538","当前请求的认证机制需要加密");
   ErrCodeHT.Add("454","临时认证失败");
   ErrCodeHT.Add("530","需要认证");

   RightCodeHT.Add("220","服务就绪");
   RightCodeHT.Add("250","要求的邮件操作完成");
   RightCodeHT.Add("251","用户非本地，将转发向<forward-path>");
   RightCodeHT.Add("354","开始邮件输入，以<enter>.<enter>结束");
   RightCodeHT.Add("221","服务关闭传输信道");
   RightCodeHT.Add("334","服务器响应验证Base64字符串");
   RightCodeHT.Add("235","验证成功");
  }

  /// <summary>
  /// 将字符串编码为Base64字符串
  /// </summary>
  /// <param name="str">要编码的字符串</param>
  private string Base64Encode(string str)
  {
   byte[] barray;
   barray=Encoding.Default.GetBytes(str);
   return Convert.ToBase64String(barray);
  }

  /// <summary>
  /// 将Base64字符串解码为普通字符串
  /// </summary>
  /// <param name="str">要解码的字符串</param>
  private string Base64Decode(string str)
  {
   byte[] barray;
   barray=Convert.FromBase64String(str);
   return Encoding.Default.GetString(barray);
  }

 
  /// <summary>
  /// 得到上传附件的文件流
  /// </summary>
  /// <param name="FilePath">附件的绝对路径</param>
  private string GetStream(string FilePath)
  {
   //建立文件流对象
   System.IO.FileStream FileStr=new System.IO.FileStream(FilePath,System.IO.FileMode.Open);
   byte[] by=new byte[System.Convert.ToInt32(FileStr.Length)];
   FileStr.Read(by,0,by.Length);
   FileStr.Close();
   return(System.Convert.ToBase64String(by));
  }

  /// <summary>
  /// 发送SMTP命令
  /// </summary>
  private bool SendCommand(string str)
  {
   byte[]  WriteBuffer;
   if(str==null||str.Trim()==String.Empty)
   {
    return true;
   }
   logs+=str;
   WriteBuffer = Encoding.Default.GetBytes(str);
   try
   {
    ns.Write(WriteBuffer,0,WriteBuffer.Length);
   }
   catch
   {
    errmsg="网络连接错误";
    return false;
   }
   return true;
  }

  /// <summary>
  /// 接收SMTP服务器回应
  /// </summary>
  private string RecvResponse()
  {
   int StreamSize;
   string ReturnValue = String.Empty;
   byte[]  ReadBuffer = new byte[1024] ;
   try
   {
    StreamSize=ns.Read(ReadBuffer,0,ReadBuffer.Length);
   }
   catch
   {
    errmsg="网络连接错误";
    return "false";
   }

   if (StreamSize==0)
   {
    return ReturnValue ;
   }
   else
   {
    ReturnValue = Encoding.Default.GetString(ReadBuffer).Substring(0,StreamSize);
    logs+=ReturnValue+this.enter;
    return  ReturnValue;
   }
  }

  /// <summary>
  /// 与服务器交互，发送一条命令并接收回应。
  /// </summary>
  /// <param name="str">一个要发送的命令</param>
  /// <param name="errstr">如果错误，要反馈的信息</param>
  private bool Dialog(string str,string errstr)
  {
   if(str==null||str.Trim()=="")
   {
    return true;
   }
   if(SendCommand(str))
   {
    string RR=RecvResponse();
    if(RR=="false")
    {
     return false;
    }
    string RRCode=RR.Substring(0,3);
    if(RightCodeHT[RRCode]!=null)
    {
     return true;
    }
    else
    {
     if(ErrCodeHT[RRCode]!=null)
     {
      errmsg+=(RRCode+ErrCodeHT[RRCode].ToString());
      errmsg+=enter;
     }
     else
     {
      errmsg+=RR;
     }
     errmsg+=errstr;
     return false;
    }
   }
   else
   {
    return false;
   }

  }

  /// <summary>
  /// 与服务器交互，发送一组命令并接收回应。
  /// </summary>

  private bool Dialog(string[] str,string errstr)
  {
   for(int i=0;i<str.Length;i++)
   {
    if(!Dialog(str[i],""))
    {
     errmsg+=enter;
     errmsg+=errstr;
     return false;
    }
   }

   return true;
  }

  /// <summary>
  /// SendEmail
  /// </summary>
  /// <returns></returns>
  private bool SendEmail()
  {
   //连接网络
   try
   {
    tc=new TcpClient(mailserver,mailserverport);
   }
   catch(Exception e)
   {
    errmsg=e.ToString();
    return false;
   }

   ns = tc.GetStream();
   SMTPCodeAdd();

   //验证网络连接是否正确
   if(RightCodeHT[RecvResponse().Substring(0,3)]==null)
   {
    errmsg="网络连接失败";
    return false;
   }

   string[] SendBuffer;
   string SendBufferstr;

   //进行SMTP验证
   if(ESmtp)
   {
    SendBuffer=new String[4];
    SendBuffer[0]="EHLO " + mailserver + enter;
    SendBuffer[1]="AUTH LOGIN" + enter;
    SendBuffer[2]=Base64Encode(username) + enter;
    SendBuffer[3]=Base64Encode(password) + enter;
    if(!Dialog(SendBuffer,"SMTP服务器验证失败，请核对用户名和密码。"))
     return false;
   }
   else
   {
    SendBufferstr="HELO " + mailserver + enter;
    if(!Dialog(SendBufferstr,""))
     return false;
   }

   //
   SendBufferstr="MAIL FROM:<" + From + ">" + enter;
   if(!Dialog(SendBufferstr,"发件人地址错误，或不能为空"))
    return false;

   //
   SendBuffer=new string[recipientmaxnum];
   for(int i=0;i<Recipient.Count;i++)
   {
    SendBuffer[i]="RCPT TO:<" + Recipient[i].ToString() +">" + enter;

   }
   if(!Dialog(SendBuffer,"收件人地址有误"))
    return false;

   /*
      SendBuffer=new string[10];
      for(int i=0;i<RecipientBCC.Count;i++)
      {

       SendBuffer[i]="RCPT TO:<" + RecipientBCC[i].ToString() +">" + enter;

      }

      if(!Dialog(SendBuffer,"密件收件人地址有误"))
       return false;
   */
   SendBufferstr="DATA" + enter;
   if(!Dialog(SendBufferstr,""))
    return false;

   SendBufferstr="From:" + FromName + "<" + From +">" +enter;

   //if(ReplyTo.Trim()!="")
   //{
   // SendBufferstr+="Reply-To: " + ReplyTo + enter;
   //}

   //SendBufferstr+="To:" + RecipientName + "<" + Recipient[0] +">" +enter;
   SendBufferstr += "To:=?"+Charset.ToUpper()+"?B?"+Base64Encode(RecipientName)+"?="+"<"+Recipient[0]

+">"+enter;
  
   SendBufferstr+="CC:";
   for(int i=0;i<Recipient.Count;i++)
   {
    SendBufferstr+=Recipient[i].ToString() + "<" + Recipient[i].ToString() +">,";
   }
   SendBufferstr+=enter;

   SendBufferstr+=((Subject==String.Empty || Subject==null)?"Subject:":((Charset=="")?("Subject:" +

Subject):("Subject:" + "=?" + Charset.ToUpper() + "?B?" + Base64Encode(Subject) +"?="))) + enter;
   SendBufferstr+="X-Priority:" + priority + enter;
   SendBufferstr+="X-MSMail-Priority:" + priority + enter;
   SendBufferstr+="Importance:" + priority + enter;
   SendBufferstr+="X-Mailer: Lion.Web.Mail.SmtpMail Pubclass [cn]" + enter;
   SendBufferstr+="MIME-Version: 1.0" + enter;
   if(Attachments.Count!=0)
   {
    SendBufferstr+="Content-Type: multipart/mixed;" + enter;
    SendBufferstr += " boundary=\"====="+

(Html?"001_Dragon520636771063_":"001_Dragon303406132050_")+"=====\""+enter+enter;
   }

   if(Html)
   {
    if(Attachments.Count==0)
    {
     SendBufferstr += "Content-Type: multipart/alternative;"+enter;//内容格式和分隔符
     SendBufferstr += " boundary=\"=====003_Dragon520636771063_=====\""+enter+enter;

     SendBufferstr += "This is a multi-part message in MIME format."+enter+enter;
    }
    else
    {
     SendBufferstr +="This is a multi-part message in MIME format."+enter+enter;
     SendBufferstr += "--=====001_Dragon520636771063_====="+enter;
     SendBufferstr += "Content-Type: multipart/alternative;"+enter;//内容格式和分隔符
     SendBufferstr += " boundary=\"=====003_Dragon520636771063_=====\""+enter+enter;

   
    }
    SendBufferstr += "--=====003_Dragon520636771063_====="+enter;
    SendBufferstr += "Content-Type: text/plain;"+ enter;
    SendBufferstr += ((Charset=="")?(" charset=\"iso-8859-1\""):(" charset=\"" +

Charset.ToLower() + "\"")) + enter;
    SendBufferstr+="Content-Transfer-Encoding: base64" + enter + enter;
    SendBufferstr+= Base64Encode("邮件内容为HTML格式，请选择HTML方式查看") + enter + enter;

    SendBufferstr += "--=====003_Dragon520636771063_====="+enter;

    SendBufferstr+="Content-Type: text/html;" + enter;
    SendBufferstr+=((Charset=="")?(" charset=\"iso-8859-1\""):(" charset=\"" +

Charset.ToLower() + "\"")) + enter;
    SendBufferstr+="Content-Transfer-Encoding: base64" + enter + enter;
    SendBufferstr+= Base64Encode(Body) + enter + enter;
    SendBufferstr += "--=====003_Dragon520636771063_=====--"+enter;
   }
   else
   {
    if(Attachments.Count!=0)
    {
     SendBufferstr += "--=====001_Dragon303406132050_====="+enter;
    }
    SendBufferstr+="Content-Type: text/plain;" + enter;
    SendBufferstr+=((Charset=="")?(" charset=\"iso-8859-1\""):(" charset=\"" +

Charset.ToLower() + "\"")) + enter;
    SendBufferstr+="Content-Transfer-Encoding: base64" + enter + enter;
    SendBufferstr+= Base64Encode(Body) + enter;
   }
  
   //SendBufferstr += "Content-Transfer-Encoding: base64"+enter;

  
   if(Attachments.Count!=0)
   {
    for(int i=0;i<Attachments.Count;i++)
    {
     string filepath = (string)Attachments[i];
     SendBufferstr += "--====="+

(Html?"001_Dragon520636771063_":"001_Dragon303406132050_") +"====="+enter;
     //SendBufferstr += "Content-Type: application/octet-stream"+enter;
     SendBufferstr += "Content-Type: text/plain;"+enter;
     SendBufferstr += " name=\"=?"+Charset.ToUpper()+"?B?"+Base64Encode

(filepath.Substring(filepath.LastIndexOf("\\")+1))+"?=\""+enter;
     SendBufferstr += "Content-Transfer-Encoding: base64"+enter;
     SendBufferstr += "Content-Disposition: attachment;"+enter;
     SendBufferstr += " filename=\"=?"+Charset.ToUpper()+"?B?"+Base64Encode

(filepath.Substring(filepath.LastIndexOf("\\")+1))+"?=\""+enter+enter;
     SendBufferstr += GetStream(filepath)+enter+enter;
    }
    SendBufferstr += "--====="+ (Html?"001_Dragon520636771063_":"001_Dragon303406132050_")

+"=====--"+enter+enter;
   }
  
  
  
   SendBufferstr += enter + "." + enter;

   if(!Dialog(SendBufferstr,"错误信件信息"))
    return false;

   SendBufferstr="QUIT" + enter;
   if(!Dialog(SendBufferstr,"断开连接时错误"))
    return false;

   ns.Close();
   tc.Close();
   return true;
  }

  #endregion

  #region
  /*
  /// <summary>
  /// 添加一个密件收件人
  /// </summary>
  /// <param name="str">收件人地址</param>
  public bool AddRecipientBCC(string str)
  {
   if(str==null||str.Trim()=="")
    return true;
   if(RecipientBCCNum<10)
   {
    RecipientBCC.Add(RecipientBCCNum,str);
    RecipientBCCNum++;
    return true;
   }
   else
   {
    errmsg+="收件人过多";
    return false;
   }
  }

  /// <summary>
  /// 添加一组密件收件人（不超过10个），参数为字符串数组
  /// </summary>
  /// <param name="str">保存有收件人地址的字符串数组（不超过10个）</param>
  public bool AddRecipientBCC(string[] str)
  {
   for(int i=0;i<str.Length;i++)
   {
    if(!AddRecipientBCC(str[i]))
    {
     return false;
    }
   }
   return true;
  }

  */  
  #endregion
 }

 #endregion
}

xmlhttp_request = new ActiveXObject("Msxml2.XMLHTTP.3.0"); //3.0或4.0, 5.0        
xmlhttp_request = new ActiveXObject("Msxml2.XMLHTTP");
xmlhttp_request = new ActiveXObject("Microsoft.XMLHTTP");

                xmlhttp_request = new XMLHttpRequest();

xmlhttp_request = new XMLHttpRequest();
xmlhttp_request.overrideMimeType('text/xml');

    try{
        if( window.ActiveXObject ){
            for( var i = 5; i; i-- ){
                try{
                    if( i == 2 ){
xmlhttp_request = new ActiveXObject( "Microsoft.XMLHTTP" );    
                    }else{
xmlhttp_request = new ActiveXObject( "Msxml2.XMLHTTP." + i + ".0" );	
                    }
xmlhttp_request.setRequestHeader("Content-Type","text/xml");
xmlhttp_request.setRequestHeader("Content-Type","gb2312");
break;}
                catch(e){                        
                    xmlhttp_request = false;
                }
            }
        }else if( window.XMLHttpRequest ){
            xmlhttp_request = new XMLHttpRequest();
            if (xmlhttp_request.overrideMimeType) {
                xmlhttp_request.overrideMimeType('text/xml');
            }
        }
    }catch(e){
        xmlhttp_request = false;
    }

xmlhttp_request.open('GET', URL, true);
xmlhttp_request.send(null);

xmlhttp_request.onreadystatechange =FunctionName;

xmlhttp_request.onreadystatechange = function(){
    // JavaScript代码段
};

if (http_request.readyState == 4) {
    // 收到完整的服务器响应
} else {
    // 没有收到完整的服务器响应
}

<script type="text/javascript" language="javascript">
function getXMLRequester( ){
    var xmlhttp_request = false;
    try{
        if( window.ActiveXObject ){
            for( var i = 5; i; i-- ){
                try{
                    if( i == 2 ){
xmlhttp_request = new ActiveXObject( "Microsoft.XMLHTTP" );    
                    }else{
xmlhttp_request = new ActiveXObject( "Msxml2.XMLHTTP." + i + ".0" );	
xmlhttp_request.setRequestHeader("Content-Type","text/xml");
xmlhttp_request.setRequestHeader("Content-Type","gb2312");
                 }
break;}
                catch(e){                        
                    xmlhttp_request = false;
                }
            }
        }else if( window.XMLHttpRequest ){
            xmlhttp_request = new XMLHttpRequest();
            if (xmlhttp_request.overrideMimeType) {
                xmlhttp_request.overrideMimeType('text/xml');
            }
        }
    }catch(e){
        xmlhttp_request = false;
    }
    return xmlhttp_request ;
}

    function IDRequest(n) {//定义收到服务器的响应后需要执行的JavaScript函数
url=n+document.getElementById('163id').value;//定义网址参数
        xmlhttp_request=getXMLRequester();//调用创建XMLHttpRequest的函数
        xmlhttp_request.onreadystatechange = doContents;//调用doContents函数
        xmlhttp_request.open('GET', url, true);
        xmlhttp_request.send(null);
    }
    function doContents() {
        if (xmlhttp_request.readyState == 4) {// 收到完整的服务器响应
            if (xmlhttp_request.status == 200) {//HTTP服务器响应的值OK
document.getElementById('message').innerHTML = xmlhttp_request.responseText;
//将服务器返回的字符串写到页面中ID为message的区域
            } else {
                alert(http_request.status);
            }
        }
    }
</script>

<input type="text" id="163id" onpropertychange="IDRequest('http://reg.163.com/register/checkssn.jsp?username=')" />

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?> 
<response>
<method>isExistedUid</method> 
<result>-2</result> 
</response>

document.getElementById('message').innerHTML = xmlhttp_request.responseText;

var response = xmlhttp_request.responseXML.documentElement;
var result = response.getElementsByTagName('result')[0].firstChild.data;//返回result节点数据
if(result ==-2){
document.getElementById('message').innerHTML = "用户名"+document.getElementById('163id').value+"尚未注册";
}
else if(result ==-1){
document.getElementById('message').innerHTML = "对不起,用户名"+document.getElementById('163id').value+"已经注册";
}

abort()		停止当前请求
getAllResponseHeaders()	作为字符串返问完整的headers
getResponseHeader("headerLabel")	作为字符串返问单个的header标签
open("method","URL"[,asyncFlag[,"userName"[, "password"]]])	设置未决的请求的目标 URL, 方法, 和其他参数
send(content)	发送请求
setRequestHeader("label", "value")		设置header并和请求一起发送

onreadystatechange			状态改变的事件触发器
readyState				对象状态(integer):
				0 = 未初始化
				1 = 读取中
				2 = 已读取
				3 = 交互中
				4 = 完成
responseText		服务器进程返回数据的文本版本
responseXML		服务器进程返回数据的兼容DOM的XML文档对象
status			服务器返回的状态码, 如：404 = "文件末找到" 、200 ="成功"
statusText		服务器返回的状态文本信息

namespace Calculator
{
 public class Form1 : System.Windows.Forms.Form
 {
  #region DETAILS...
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Label label2;
  private System.Windows.Forms.TextBox txtNumber1;
  private System.Windows.Forms.Button cmdAdd;
  private System.Windows.Forms.TextBox txtNumber2;
  private System.Windows.Forms.Button cmdEnable;
  private System.Windows.Forms.Button cmdDisable;
  /// <summary>
  /// Required designer variable.
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   //
   // Required for Windows Form Designer support
   //
   InitializeComponent();

   //
   // TODO: Add any constructor code after InitializeComponent call
   //
  }

  /// <summary>
  /// Clean up any resources being used.
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #endregion

  #region Windows Form Designer generated code
  /// <summary>
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// </summary>
  private void InitializeComponent()
  {
   this.label1 = new System.Windows.Forms.Label();
   this.label2 = new System.Windows.Forms.Label();
   this.txtNumber1 = new System.Windows.Forms.TextBox();
   this.txtNumber2 = new System.Windows.Forms.TextBox();
   this.cmdAdd = new System.Windows.Forms.Button();
   this.cmdEnable = new System.Windows.Forms.Button();
   this.cmdDisable = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(24, 24);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(120, 32);
   this.label1.TabIndex = 0;
   this.label1.Text = "Number 1:";
   //
   // label2
   //
   this.label2.Location = new System.Drawing.Point(24, 72);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(120, 32);
   this.label2.TabIndex = 2;
   this.label2.Text = "Number 2:";
   //
   // txtNumber1
   //
   this.txtNumber1.Location = new System.Drawing.Point(152, 24);
   this.txtNumber1.Name = "txtNumber1";
   this.txtNumber1.Size = new System.Drawing.Size(160, 29);
   this.txtNumber1.TabIndex = 1;
   this.txtNumber1.Text = "";
   //
   // txtNumber2
   //
   this.txtNumber2.Location = new System.Drawing.Point(152, 72);
   this.txtNumber2.Name = "txtNumber2";
   this.txtNumber2.Size = new System.Drawing.Size(160, 29);
   this.txtNumber2.TabIndex = 3;
   this.txtNumber2.Text = "";
   //
   // cmdAdd
   //
   this.cmdAdd.Location = new System.Drawing.Point(168, 120);
   this.cmdAdd.Name = "cmdAdd";
   this.cmdAdd.Size = new System.Drawing.Size(128, 56);
   this.cmdAdd.TabIndex = 4;
   this.cmdAdd.Text = "Add";
   this.cmdAdd.Click += new System.EventHandler(this.cmdAdd_Click);
   //
   // cmdEnable
   //
   this.cmdEnable.CausesValidation = false;
   this.cmdEnable.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
   this.cmdEnable.Location = new System.Drawing.Point(24, 280);
   this.cmdEnable.Name = "cmdEnable";
   this.cmdEnable.Size = new System.Drawing.Size(272, 48);
   this.cmdEnable.TabIndex = 6;
   this.cmdEnable.TabStop = false;
   this.cmdEnable.Text = "Enable Validation";
   this.cmdEnable.Click += new System.EventHandler(this.cmdEnable_Click);
   //
   // cmdDisable
   //
   this.cmdDisable.CausesValidation = false;
   this.cmdDisable.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
   this.cmdDisable.Location = new System.Drawing.Point(24, 216);
   this.cmdDisable.Name = "cmdDisable";
   this.cmdDisable.Size = new System.Drawing.Size(272, 48);
   this.cmdDisable.TabIndex = 5;
   this.cmdDisable.TabStop = false;
   this.cmdDisable.Text = "Disable Validation";
   this.cmdDisable.Click += new System.EventHandler(this.cmdDisable_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(10, 22);
   this.ClientSize = new System.Drawing.Size(338, 352);
   this.Controls.AddRange(new System.Windows.Forms.Control[] {
                    this.cmdDisable,
                    this.cmdEnable,
                    this.cmdAdd,
                    this.txtNumber2,
                    this.txtNumber1,
                    this.label2,
                    this.label1});
   this.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
   this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
   this.MaximizeBox = false;
   this.Name = "Form1";
   this.Text = "Calculator";
   this.Load += new System.EventHandler(this.Form1_Load);
   this.ResumeLayout(false);

  }
  #endregion

  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }

  private void cmdAdd_Click(object sender, System.EventArgs e)
  {
   int  num1, num2, result;

   num1 = int.Parse(this.txtNumber1.Text);
   num2 = int.Parse(this.txtNumber2.Text);

   result = num1 + num2;

   MessageBox.Show("The sum = " + result, "Calculator");
  }

  private void Form1_Load(object sender, System.EventArgs e)
  {
   this.txtNumber1.Validating += new System.ComponentModel.CancelEventHandler(Validation.IsInteger);
   this.txtNumber2.Validating += new System.ComponentModel.CancelEventHandler(Validation.IsInteger);

   // validation is already enabled, so prevent user from adding more validation handlers
   this.cmdEnable.Enabled = false; 
  }

  private void cmdDisable_Click(object sender, System.EventArgs e)
  {
   this.txtNumber1.Validating -= new System.ComponentModel.CancelEventHandler(Validation.IsInteger);
   this.txtNumber2.Validating -= new System.ComponentModel.CancelEventHandler(Validation.IsInteger);

   // toggle buttons so user can enable later...
   this.cmdDisable.Enabled = false;
   this.cmdEnable.Enabled  = true;
  }

  private void cmdEnable_Click(object sender, System.EventArgs e)
  {
   this.txtNumber1.Validating += new System.ComponentModel.CancelEventHandler(Validation.IsInteger);
   this.txtNumber2.Validating += new System.ComponentModel.CancelEventHandler(Validation.IsInteger);

   // toggle buttons so user can disable later...
   this.cmdEnable.Enabled  = false;
   this.cmdDisable.Enabled = true;
  }

 }
}

//定义代理函数
using System;
using SWF = System.Windows.Forms;

namespace Calculator
{

 public class Validation
 {

  public static void IsInteger(object sender, System.ComponentModel.CancelEventArgs e)
  {
   SWF.TextBox  txt;
   txt = (SWF.TextBox) sender;

   try
   {
    int.Parse(txt.Text);
   }
   catch(FormatException)
   {
    SWF.MessageBox.Show("Please enter a numeric value.", "Calculator");
    e.Cancel = true;  // cancel validation, returns focus
   }
   catch(OverflowException)
   {
    SWF.MessageBox.Show("Please enter an integer in the range " + int.MinValue + " ... " + int.MaxValue, "Calculator");
    e.Cancel = true;  // cancel validation, returns focus
   }
   catch(Exception ex)
   {
    SWF.MessageBox.Show("Unknown error: " + ex.Message, "Calculator");
    e.Cancel = true;  // cancel validation, returns focus
   }
  }
 
 }//class
}//namespace

   }

  }


private void OnItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
   {
        if(e.Item.ItemType != ListItemType.Header && e.Item.ItemType != ListItemType.Footer )
        {
            LinkButton btnSave = (LinkButton)e.Item.Cells[2].Controls[0];
　　    string strClientID = btnSave.ClientID; //得到该控件的客户端ID，可供JavaScript调用
            btnSave.Attributes.Add("onclick","Javascript:return confirm('Are you sure to save?');");
        }
}