C # uses Gmail to send mail

Recently in doing a mailbox verification function, find a lot of code, or not satisfactory, but, after a search or have harvested, so there is the following code

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Text;
Using System.Net.Mail;
Using System.Web.Mail;
Using System.Net;
Using System.ComponentModel;
            Namespace MailSender {class Program {static void Main (string[] args) {try
                {MailMessage mm = new MailMessage ();
                MailAddress Fromma = new MailAddress ("zjyOxcj@gmail.com");
                MailAddress Toma = new MailAddress ("674026565@qq.com", null); Mm.
                from = Fromma; Recipient mm.
                To.add ("674026565@qq.com"); Mailbox title mm.
                Subject = "Hello Dear:"; Mm.
                Isbodyhtml = true; Message content mm. BODY = "Hello, Mr Meteor."
                "; The encoding format for the content mm.
                bodyencoding = System.Text.Encoding.UTF8; Mm.
                ReplyTo = Toma; Mm.
                Sender =fromma; Mm.
                Isbodyhtml = false;Mm.
                Deliverynotificationoptions = deliverynotificationoptions.onsuccess; Mm. Cc.
                ADD (Toma);
                SmtpClient sc = new SmtpClient ();
                NetworkCredential NC = new NetworkCredential (); nc. UserName = "zjyOxcj@gmail.com";//Your email address NC. Password = "Password";//Your email password, here the password is xxxxx@qq.com mailbox password, special instructions under ~ SC.
                useDefaultCredentials = true; Sc.
                Deliverymethod = Smtpdeliverymethod.network; Sc.
                Credentials = NC; Sc.
                Enablessl = true; Sc.
                Port = 587; If you report mail from address must is same as authorization user this error, is your QQ mailbox does not open SMTP, SC.
                Host = "smtp.gmail.com"; Sc.
            Send (mm); The catch (Exception ex) {Console.Write (ex). Message + "" + Ex.
            Source); }
        }
       
    }
}