System.Net.Mail 发送邮件代码

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System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();    msg.To.Add("111111@qq.com");    msg.From = new System.Net.Mail.MailAddress("111111@qq.com", "zmh886", System.Text.Encoding.UTF8);     msg.Subject = "这是测试邮件";//邮件标题    msg.SubjectEncoding = System.Text.Encoding.UTF8;//邮件标题编码    msg.Body = "邮件内容";//邮件内容    msg.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码    msg.IsBodyHtml = false;//是否是HTML邮件    System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();    client.Credentials = new System.Net.NetworkCredential("111111@qq.com", "密码");     client.Host = "smtp.qq.com";    object userState=msg;    try    {     client.Send(msg);      //client.SendAsync(msg, userState); //异步发送     Response.Write("发送成功");      }      catch (System.Net.Mail.SmtpException ex)     {      Response.Write("发送邮件出错！<br>" + ex.Message);      }