public void sendMail(string SendToEmail,string UserName，string content)
    {
        System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
        mail.From = new System.Net.Mail.MailAddress("penjiluwa@126.com");
        mail.To.Add(new System.Net.Mail.MailAddress(SendToEmail));

        mail.Subject = "学业通激活码";
        mail.Body = "尊敬的客户"+UserName+"<br/>，"+content;
        mail.Priority = MailPriority.High;
        mail.BodyEncoding = System.Text.UnicodeEncoding.UTF8;     //编码
        mail.SubjectEncoding = System.Text.UnicodeEncoding.UTF8;      //编码     
        System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient("smtp.126.com");
//你的email的smtp地址
        client.UseDefaultCredentials = true;
        client.Credentials = new System.Net.NetworkCredential("ss@126.com", "123456");
 //换成你自己的邮箱用户名和密码      
　　　　client.DeliveryMethod = SmtpDeliveryMethod.Network;
        client.Send(mail);


    }