///   <summary>
                ///   发送邮件
                ///   </summary>
                ///   <param   name= "strSmtpServer "> smtp地址 </param>
                ///   <param   name= "UserName "> 用户名 </param>
                ///   <param   name= "Password "> 密码 </param>
                ///   <param   name= "strFrom "> 发信人地址 </param>
                ///   <param   name= "strto "> 收信人地址 </param>
                ///   <param   name= "strSubject "> 邮件标题 </param>
                ///   <param   name= "strBody "> 邮件正文 </param>
                public   static   void   SendMail(string   strSmtpServer,   string   UserName,   string   Password,   string   strFrom,   string   strto,   string   strSubject,   string   strBody,   string   strFileName)
                {
                        //生成一个   使用SMTP发送邮件的客户端对象
                        System.Net.Mail.SmtpClient   client   =   new   System.Net.Mail.SmtpClient(strSmtpServer); //表示以当前登录用户的默认凭据进行身份验证
                        client.UseDefaultCredentials   =   true; //包含用户名和密码
                        client.Credentials   =   new   System.Net.NetworkCredential(UserName,   Password); //指定如何发送电子邮件。
                          //Network                                             电子邮件通过网络发送到   SMTP   服务器。    
                          //PickupDirectoryFromIis               将电子邮件复制到挑选目录，然后通过本地   Internet   信息服务   (IIS)   传送。    
                          //SpecifiedPickupDirectory           将电子邮件复制到   SmtpClient.PickupDirectoryLocation   属性指定的目录，然后由外部应用程序传送。    

                        client.DeliveryMethod   =   System.Net.Mail.SmtpDeliveryMethod.Network; //建立邮件对象  
                        System.Net.Mail.MailMessage   message   =   new   System.Net.Mail.MailMessage(strFrom,   strto,   strSubject,strBody);
                       
                        //定义邮件正文，主题的编码方式
                        message.BodyEncoding   =   System.Text.Encoding.GetEncoding( "gb2312 ");
                        message.SubjectEncoding   =   System.Text.Encoding.GetEncoding( "gb2312 ");
                     
                        //获取或设置一个值，该值指示电子邮件正文是否为   HTML。  
                        message.IsBodyHtml   =   false;
                       
                        //指定邮件优先级
         
                        message.Priority   =   System.Net.Mail.MailPriority.Normal; //添加附件
                        //System.Web.Mail.MailAttachment   mailAttachment=new   System.Web.Mail.MailAttachment(@ "f:/baihe.txt ");  
                        if   (strFileName   !=   " "   &&   strFileName   !=   null)
                        {
                                Attachment   data   =   new   Attachment(strFileName);
                                message.Attachments.Add(data);
                        }
                   
                       
                        //发件人身份验证,否则163   发不了
                        client.Credentials   =     new   System.Net.NetworkCredential(strFrom,   Password); //发送
                        client.Send(message);
                }
        }