Как заставить хук ловить 2 клавиши? - C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using System.Windows.Forms;
 
namespace Sp108.com
{
    public class Hook : IDisposable
    {
        #region Declare WinAPI functions
        [DllImport("kernel32.dll")]
        private static extern IntPtr LoadLibrary(string lpFileName);
 
        [DllImport("user32.dll")]
        private static extern IntPtr SetWindowsHookEx(int idHook, KeyboardHookProc callback, IntPtr hInstance, uint threadId);
        [DllImport("user32.dll")]
        private static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, int wParam, IntPtr lParam);
        [DllImport("user32.dll")]
        private static extern bool UnhookWindowsHookEx(IntPtr hInstance);
        #endregion
        #region Constants
        private const int WH_KEYBOARD_LL = 13;
        private const int WH_KEYDOWN = 0x0100;
        #endregion
 
        // код клавиши на которую ставим хук
        private int _key;
        private int _key2;
        public event KeyPressEventHandler KeyPressed;
 
        private delegate IntPtr KeyboardHookProc(int code, IntPtr wParam, IntPtr lParam);
        private KeyboardHookProc _proc;
        private IntPtr _hHook = IntPtr.Zero;
 
        public Hook(int keyCode, int keyCode2 = -1)
        {
            _key = keyCode;
            _key2 = keyCode2;
            _proc = HookProc;
        }
 
        public void SetHook()
        {
            var hInstance = LoadLibrary("User32");
            _hHook = SetWindowsHookEx(WH_KEYBOARD_LL, _proc, hInstance, 0);
        }
 
        public void Dispose()
        {
            UnHook();
        }
 
        public void UnHook()
        {
            UnhookWindowsHookEx(_hHook);
        }
 
        private IntPtr HookProc(int code, IntPtr wParam, IntPtr lParam)
        {
            if(_key2 != -1)
            {
                if ((code >= 0 && wParam == (IntPtr)WH_KEYDOWN) && Marshal.ReadInt32(lParam) == _key && Marshal.ReadInt32(lParam) == _key2)
                {
                    if (KeyPressed != null)
                    {
                        KeyPressed(this, new KeyPressEventArgs(Convert.ToChar(code)));
                    }
                }
            }  else
            {
                if ((code >= 0 && wParam == (IntPtr)WH_KEYDOWN) && Marshal.ReadInt32(lParam) == _key)
                {
                    if (KeyPressed != null)
                    {
                        KeyPressed(this, new KeyPressEventArgs(Convert.ToChar(code)));
                    }
                }
            }
 
            // пробрасываем хук дальше
            return CallNextHookEx(_hHook, code, (int)wParam, lParam);
        }
    }
}

        private void Form1_Load(object sender, EventArgs e)
        {
            _hook = new com.Hook(0x60);
            _hook.KeyPressed += new KeyPressEventHandler(_hook_hide);
            _hook.SetHook();
        }
 
        void _hook_hide(object sender, KeyPressEventArgs e) //Событие нажатия клавиш
        {
            this.Visible = !this.Visible;
            this.Activate();
        }