try this code surely this will work.
Try this link http://www.dotnetspider.com/projects/577-Send-Mail-with-Attachments-using-Gmail.aspx
/// <summary> /// Sends an mail message /// </summary> /// <param name="from">Sender address</param> /// <param name="to">Recepient address</param> /// <param name="bcc">Bcc recepient</param> /// <param name="cc">Cc recepient</param> /// <param name="subject">Subject of mail message</param> /// <param name="body">Body of mail message</param> public static void SendMailMessage(string from, string to, string bcc, string cc, string subject, string body) { // Instantiate a new instance of MailMessage MailMessage mMailMessage = new MailMessage(); // Set the sender address of the mail message mMailMessage.From = new MailAddress(from); // Set the recepient address of the mail message mMailMessage.To.Add(new MailAddress(to)); // Check if the bcc value is null or an empty string if ((bcc != null) && (bcc != string.Empty)) { // Set the Bcc address of the mail message mMailMessage.Bcc.Add(new MailAddress(bcc)); } // Check if the cc value is null or an empty value if ((cc != null) && (cc != string.Empty)) { // Set the CC address of the mail message mMailMessage.CC.Add(new MailAddress(cc)); } // Set the subject of the mail message mMailMessage.Subject = subject; // Set the body of the mail message mMailMessage.Body = body; // Set the format of the mail message body as HTML mMailMessage.IsBodyHtml = true; // Set the priority of the mail message to normal mMailMessage.Priority = MailPriority.Normal; // Instantiate a new instance of SmtpClient SmtpClient mSmtpClient = new SmtpClient(); // Send the mail message mSmtpClient.Send(mMailMessage); }