c#的一段邮件邮件发送代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Mail;

namespace WareMec.ODL
{
    public class Class2
    {
        /// <summary> 
        /// 发送邮件程序 
        /// </summary> 
        /// <param name="from">发送人邮件地址</param> 
        /// <param name="fromname">发送人显示名称</param> 
        /// <param name="to">发送给谁（邮件地址）</param> 
        /// <param name="subject">标题</param> 
        /// <param name="body">内容</param> 
        /// <param name="username">邮件登录名</param> 
        /// <param name="password">邮件密码</param> 
        /// <param name="server">邮件服务器</param> 
        /// <param name="fujian">附件</param> 
        /// <returns>send ok</returns> 
        /// 调用方法 SendMail("abc@126.com", "某某人", "cba@126.com", "你好", "我测试下邮件", "邮箱登录名", "邮箱密码", "smtp.126.com", ""); 
        public string SendMail(string from, string fromname, string to, string subject, string body,
            string username, string password, string server, string fujian)
        {
            try
            {
                //邮件发送类 
                MailMessage mail = new MailMessage();