Send Mail Using C#

public void SEND_MAIL()
{
    ServicePointManager.ServerCertificateValidationCallback =
        delegate(object s, X509Certificate certificate,
            X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
        return true;
    };
    SmtpClient serverobj = new SmtpClient();
    serverobj.Credentials = new NetworkCredential("Your Mail Address", "password");
    serverobj.Port = 25;
    serverobj.Host = "smtp.gmail.com";
    serverobj.EnableSsl = true;
    obj = new MailMessage();
    obj.From = new MailAddress("Your Mail Address", "Display Name", System.Text.Encoding.UTF8);
    obj.To.Add("Mail Address To Send Mail");
    //Eg . obj.To.Add("[email protected]");
    obj.Priority = MailPriority.High;
    obj.Subject = "TEST MAIL";
    string date = DateTime.Now.ToString();
    obj.IsBodyHtml = true;
    ////Coding for send iomage inline -----------------
    string htmlBody = "<html><body><h1>Picture</h1><br><img src=\"cid:Pic1\"></body></html>";
    AlternateView avHtml = AlternateView.CreateAlternateViewFromString
        (htmlBody, null, MediaTypeNames.Text.Html);
    // Coding for send image inline
    LinkedResource pic1 = new LinkedResource("pic.jpg", MediaTypeNames.Image.Jpeg);
    pic1.ContentId = "Pic1";
    avHtml.LinkedResources.Add(pic1);
    obj.AlternateViews.Add(avHtml);
    ////END Coding for send image inline -----------------
    //Coding for HTML file attachment
    string body = string.Empty;
    using(StreamReader reader = new StreamReader(@ "D:\Test.htm"))
    {
        body = reader.ReadToEnd();
    }
    obj.Body = body;
    //--------------------
    //Coding for HTML BODY message----------------------
    obj.Body = "<b>MY MAIL</b><li>Fisrt Page</li><li>Second Page</li> <li>Thirsd Page</li> <br/> Sample text mail ";
    //Coding for HTML BODY message-------------------------
    //Coding for attachment
    Attachment data = new Attachment("C:\\image.png");
    obj.Attachments.Add(data);
    serverobj.Send(obj);
    MessageBox.Show("Your message has been sent");
}