How to send an Email using C#

using System.Net.Mail;

using System.Net;

void SendEmail()

        {

            try

           {

           MailMessage msg = new MailMessage();

           msg.From = new MailAddress(SenderAddress);

           msg.To.Add(new MailAddress(ReceiverAddress));

           msg.Body = Bodymessage;

           msg.Subject = subject;

           msg.IsBodyHtml = true;

           System.Net.Mail.Attachment attachment;

           attachment = new System.Net.Mail.Attachment(imagepath);

           msg.Attachments.Add(attachment);

           SmtpClient smtp = new SmtpClient();

           smtp.Host = "smtp.gmail.com";

           smtp.Port = 587;

           smtp.Credentials = new NetworkCredential(NetworkCredential mailid, NetworkCredential password);

           smtp.EnableSsl = true;

           smtp.Send(msg);

           }

           catch (Exception)

           {

            MessageBox.Show("Error in sending the mail", "Error");

           }

        }