用户在注册成功后,发送用户名和密码到其注册邮箱的方法 .

/// <summary>
    /// 注册时发送用户帐号跟密码
    /// </summary>
    /// <param name="receiver">用户注册邮箱</param>
    /// <param name="username">用户名</param>
    /// <param name="password">用户密码明文</param>
    public bool Register(string receiver, string username, string password)
    {
        System.Net.Mail.SmtpClient client;
        client = new System.Net.Mail.SmtpClient("smtp.126.com");
        client.Timeout = 60000;
        client.UseDefaultCredentials = false;
        client.Credentials = new System.Net.NetworkCredential("邮箱号", "邮箱密码");
        client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
        System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
        message.SubjectEncoding = System.Text.Encoding.UTF8;
        message.BodyEncoding = System.Text.Encoding.UTF8;
        message.From = new System.Net.Mail.MailAddress("邮箱号", "显示名称", System.Text.Encoding.UTF8);
        message.To.Add(new System.Net.Mail.MailAddress(receiver, username, System.Text.Encoding.UTF8));
        message.IsBodyHtml = false;//是否html编码
        message.Subject = "用户注册信息";
        message.Body = username + "：您好！/r/n    您注册的用户名是：" + username + "；密码是：" + password + "。/r/n    ";
        try
        {
            client.Send(message);
            Response.Write("发送成功!");
            return true;
        }
        catch
        {
            return false;
        }
    }