pastebin - collaborative debugging

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
//InteropServices is what allows us to use DllImport

namespace ExampleBot
{
    public partial class Form1 : Form
    {

        //FindWindow
        [DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr FindWindow(
            string lpClassName,
            string lpWindowName);

        //hWnd to make it easier
        IntPtr hWnd = FindWindow(
            null,
            "MapleStory");

        //PostMessage
        [return: MarshalAs(UnmanagedType.Bool)]
        [DllImport("user32.dll", SetLastError = true)]
            static extern bool PostMessage(
            IntPtr hWnd,
            uint Msg,
            int wParam,
            int lParam);
        //Define WM_KEYDOWN
            const int WM_KEYDOWN = 0x100;

        public Form1()
        {
            InitializeComponent();
        }

        private void chksendkey_CheckedChanged(object sender, EventArgs e)
        {
            tmrsendkey.Enabled ^= true;
            // ^= is xor. This means that if it's false, it will become true. If it's true, it will become false. (Opposite)
        }

        private void txtdelay_TextChanged(object sender, EventArgs e)
        {
            tmrsendkey.Interval = Convert.ToInt32(txtdelay.Text);
            //You must convert to an int because txtdelay.Text is a string and it won't convert itself :3
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            FindWindow(null, "MapleStory");
            /* null would be where the Window Class would be.
             * Which is MapleStoryClass for MS. But apparently the class
             * when the 'play screen' is up isnt' MapleStoryClass,
             * and I like opening my stuff at the play screen.
             * So I just used the Window Name instead.
             */
        }

        private void tmrsendkey_Tick(object sender, EventArgs e)
        {
            PostMessage(hWnd, WM_KEYDOWN, 0x41, 0x1e0001);
            //0x41 is wParam and 0x1e0001 is lParam
            //You can find a list of these at http://pastebin.com/f6c1db818

        }
    }
}