Keyboard volume intercepter

Program.cs

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

namespace VolumeFucker
{
    internal static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new MyCustomApplicationContext());
        }


    }

    public class MyCustomApplicationContext : ApplicationContext
    {
        private NotifyIcon trayIcon;
        private static IntPtr _hookID = IntPtr.Zero;
        private const int WH_KEYBOARD_LL = 13;
        private const int WM_KEYDOWN = 0x0100;
        private LowLevelKeyboardProc _proc = HookCallback;

        public MyCustomApplicationContext()
        {
            // Initialize Tray Icon
            trayIcon = new NotifyIcon()
            {
                Icon = new Icon("main.ico"),
                ContextMenu = new ContextMenu(new MenuItem[] {
                    new MenuItem("Exit", Exit)
                }),
                Visible = true,
                Text = "Volume key intercepter"
            };

            // Keyboard hook here
            _hookID = SetHook(_proc);
        }


        void Exit(object sender, EventArgs e)
        {
            // Remove hook and dispose of tray icon before exiting
            UnhookWindowsHookEx(_hookID);
            trayIcon.Visible = false;

            Application.Exit();
        }

        // Hook setup and callback methods

        private IntPtr SetHook(LowLevelKeyboardProc proc)
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
                    GetModuleHandle(curModule.ModuleName), 0);
            }
        }

        private delegate IntPtr LowLevelKeyboardProc(
            int nCode, IntPtr wParam, IntPtr lParam);

        private static IntPtr HookCallback(
            int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
            {
                int vkCode = Marshal.ReadInt32(lParam);
                // Check if the key is your volume key, then discard it
                //Debug.Print(vkCode.ToString());
                if (vkCode == 174 || vkCode == 175)
                {
                    return (IntPtr)1; // Return 1 to discard the key event
                }
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook,
            LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
            IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);
    }
}