simple steam account manager

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Threading;
using System.IO;

namespace steamautologin
{
    public partial class Form1 : Form
    {
        #region DLL IMPORTS

        [DllImport("user32.dll")]
        public static extern void mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);


        [DllImport("User32.Dll")]
        public static extern long SetCursorPos(int x, int y);

        [DllImport("user32.dll")]

        private static extern bool SetWindowPos(IntPtr hWnd,
        int hWndInsertAfter, int x, int y, int cx, int cy, int uFlags);

        #endregion

        #region enums
        private const int MOUSEEVENT_LEFTDOWN = 0x02;
        private const int MOUSEEVENT_LEFTUP = 0x04;
        private const int HWND_TOPMOST = -1;
        private const int SWP_NOMOVE = 0x0002;
        private const int SWP_NOSIZE = 0x0001;
        #endregion


        /* temporary file path (to store username and passwords)
         * Example :
         *
         * username,password
         * username2,password2
         *
         */
        static string path = @"C:\18nakedcowboys.txt";



        /* user struct, can add things such as nicknames.
         * Example : username = mainaccount
         * password = badpass123
         * nickname = main
         * In this case we could select the nickname instead of the account username
         */
        struct user
        {
            public user(string user, string pass)
            {
                username = user;
                password = pass;
            }
            public string username { get; }
            public string password { get; }
        }

        // List of users
        List<user> userlist = new List<user>();



        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            CheckForIllegalCrossThreadCalls = false;

            // if client does not have a datafile create a new

            if (!File.Exists(path))
            {

                StreamWriter sw = File.CreateText(path);
                sw.Flush();
                sw.Dispose();
            }

            // Load data to combobox and userlist
            List<string> lines = File.ReadAllLines(path).ToList();

            foreach (var line in lines)
            {
                string[] entries = line.Split(',');
                user newuser = new user(entries[0], entries[1]);
                comboBox1.Items.Add(entries[0]);
                userlist.Add(newuser);
            }

        }

        private void button1_Click(object sender, EventArgs e)
        {
             // add new user to datafile
            List<string> lines = File.ReadAllLines(path).ToList();
            var User = new user(textBox1.Text, textBox2.Text);
            userlist.Add(User);
            lines.Add(User.username + "," + User.password);
            File.WriteAllLines(path, lines);

            //refresh combobox
            comboBox1.Items.Clear();
            foreach (user v in userlist)
            {
                comboBox1.Items.Add(v.username);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            // separate thread to not freeze the window
            var ds = new Thread(login) { IsBackground = true };
            ds.Start();
        }

        void login()
        {
            // kill current steam process if there is one
            foreach (var process in Process.GetProcessesByName("steam"))
            {
                process.Kill();
            }

            // Start steam, default installation dir
            Process.Start(@"C:\Program Files (x86)\Steam\steam.exe");


            // Retard loop by me, wait for updates to finish then set steam ontop + to the coordinates 200,200
            bool cont = false;
            while (true)
            {
                foreach (var process in Process.GetProcessesByName("steam"))
                {

                    if (process.MainWindowTitle == "Steam Login")
                    {
                        cont = true;
                        SetWindowPos(process.MainWindowHandle, HWND_TOPMOST, 200, 200, 0, 0, SWP_NOSIZE);
                        break;
                    }
                }
                if (cont == true)
                    break;
                Thread.Sleep(100);
            }

            Thread.Sleep(200);


            // username textbox is at the coordinates (530,300) when we set the steam login window's coordinates to (200,200)
            SetCursorPos(530, 300);
            // double click so we select all the text
            leftclick();
            leftclick();
            Thread.Sleep(10); // a little delay because it seemed to break if no delay.
            SendKeys.SendWait(userlist[comboBox1.SelectedIndex].username);

            // Password textbox is located 30 pixels below the username textbox.

            SetCursorPos(530, 330);
            leftclick();
            leftclick();
            Thread.Sleep(10);
            SendKeys.SendWait(userlist[comboBox1.SelectedIndex].password);

            // click login button
            SetCursorPos(350, 396);
            Thread.Sleep(10);
            leftclick();
            leftclick();
        }

        // I don't think I have to explain this one
        void leftclick()
        {
            mouse_event(MOUSEEVENT_LEFTDOWN, 0, 0, 0, 0);
            mouse_event(MOUSEEVENT_LEFTUP, 0, 0, 0, 0);
        }

    }
}