第三部分，构造函数和公共过程

答案：接上
------------------------
//构造函数
public ESmtpMail() 
{ 
    Attachments = new System.Collections.ArrayList(); 
}
//-----------------过程
        /// <summary> 
        /// 添加邮件附件 
        /// </summary> 
        /// <param name="path">附件绝对路径</param> 
        public void AddAttachment(string path) 
        { 
            Attachments.Add(path); 
        } 


        /// <summary> 
        /// 添加一个收件人 
        /// </summary>    
        /// <param name="str">收件人地址</param> 
        public bool AddRecipient(string str) 
        { 
            str=str.Trim(); 
            if(str==null||str==""||str.IndexOf("@")==-1) 
                return true; 
            if(RecipientNum<recipientmaxnum) 
            { 
                Recipient.Add(RecipientNum,str); 
                RecipientNum++;             
                return true; 
            } 
            else 
            { 
                errmsg+="收件人过多"; 
                return false; 
            } 
        } 


        /// <summary> 
        /// 添加一组收件人（不超过recipientmaxnum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recipientmaxnum个）</param>    
        public bool AddRecipient(string[] str) 
        { 
            for(int i=0;i<str.Length;i++) 
            { 
                if(!AddRecipient(str[i])) 
                { 
                    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(Recipient.Count==0) 
            { 
                errmsg="收件人列表不能为空"; 
                return false; 
            } 

            if(mailserver.Trim()=="") 
            { 
                errmsg="必须指定SMTP服务器"; 
                return false; 
            } 

            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> 
     &

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