How to send an email?

Question

Hi i want to develop Email sending application....

i have tried coding like this

      public void sendMail(string toList, string fromlist, string ccList, string subject, string body)

        {

            MailMessage message = new MailMessage();

            SmtpClient smtpClient = new SmtpClient();

            MailAddress fromAddress = new MailAddress(fromlist);

            message.From = fromAddress;

            message.To.Add(toList);

            if (ccList != null && ccList != string.Empty)

            {

                message.CC.Add(ccList);

            }

            message.Subject = subject;

            message.IsBodyHtml = true;

            message.Body = body;

            smtpClient.Host = "127.0.0.1";

            smtpClient.Port = 25;

            smtpClient.UseDefaultCredentials = true;

            smtpClient.Credentials = new System.Net.NetworkCredential(txtfromadd.Text, txtpwd.Text);

            smtpClient.Send(message);

        }

        protected void btnSubmit_Click(object sender, EventArgs e)

        {

            //string fromadd = txtfromadd.Text;

            string tocc = "[email protected]";

            sendMail(txtToAddress.Text, txtfromadd.Text, tocc, txtSubject.Text, txtContent.Text);

        }
but i got error in this line  smtpClient.Send(message);

iI want to change any settings in config...