Mailing script doesn't work.

Question

I need to make a mailing script. It needs to mail a certain string to me and save the string as a file. The saving part works but the mailing parts seem to fail? Could someone please tell me what I'm doing wrong here?

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Net;

using System.Net.Mail;

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            

        }

        private void label2_Click(object sender, EventArgs e)

        {

        }

        private void username_TextChanged(object sender, EventArgs e)

        {

            

        }

        private void userplot_TextChanged(object sender, EventArgs e)

        {

        }

        private void userreason_TextChanged(object sender, EventArgs e)

        {

        }

        private void sendrequest_Click(object sender, EventArgs e)

        {

            string user = username.Text;

            string plot = userplot.Text;

            string reason = userreason.Text;

            string all = user + "  -  " + plot + "  -  " + reason;

            System.IO.File.CreateText (all);

            try

            {

                MailMessage mail = new MailMessage();

                SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");

                mail.From = new MailAddress("[email protected]");

                mail.To.Add("[email protected]");

                mail.Subject = "Test Mail - 1";

                mail.Body = all;

                SmtpServer.Port = 587;

                SmtpServer.Credentials = new System.Net.NetworkCredential("[email protected]", "**********");

                SmtpServer.EnableSsl = true;

                SmtpServer.Send(mail); 

                MessageBox.Show("mail Send");

            }

            catch (Exception ex)

            {

                Console.WriteLine(ex.ToString());

            }

        }

    }

}