ASP.NET中发送邮件

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Mail;

public partial class Default3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    /**////   <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);
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        SendMail("smtp.163.com", "xxxxxx", "xxxxxx", "xxxxx", "xxxxx", "1111111", "dsfsfsfsdffsd", "");
    }
}