string to = "someone@hotmail.com";
            
            // here the username can be any address
            // this is the address that the reciever will reply to when he/she hits the Reply button
            // this doesn't have to be the same as the credential address below.
            string from = "username@gmail.com";
            string subject = "My mail from C#";
            
            string body = "<a href=\"http://www.microsoft.com\"> Click here </a><br/><img src=\"http://t0.gstatic.com/images?q=tbn:2LUYVF-U1KxK2M:http://img.bollywoodsargam.com/albumsbolly/Priyanka_Chopra/Priyanka_Chopra_In_Barsaat_Movie_Stills_002_18_08_2005.jpg\"/>";


            System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage(from, to, subject, body);

            msg.IsBodyHtml = true;
           
            // adding attachement
            System.Net.Mail.Attachment at = new System.Net.Mail.Attachment(@"C:\Users\Thurupathan\Desktop\myfile.zip");
            msg.Attachments.Add(at);
            
            // sending from the gmail account
            // for the hotmail / live / outlook => smtp.live.com  port => 587
            System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.gmail.com", 587);
            
            // provide credentials
            System.Net.NetworkCredential gmailAuthentication = new System.Net.NetworkCredential("username@gmail.com", "password");
            smtp.Credentials = gmailAuthentication;
            
            // SSL enable based on the 
            smtp.EnableSsl = true;
            try
            {
                smtp.Send(msg);
            }
            catch (Exception ex)
            {    
                Console.WriteLine(ex.Message);
            }