Как закрыть программу у которой фокус winapi в C#

procedure KillActiveProgram;
const PROCESS_TERMINATE = $0001;var
        ProcessHandle : THandle;
        ProcessID: Integer;
begin
 GetWindowThreadProcessID(GetForegroundWindow, @ProcessID);
 ProcessHandle := OpenProcess(PROCESS_TERMINATE, FALSE, ProcessId);
 TerminateProcess(ProcessHandle,4);
end;

        [DllImport("user32.dll")]
        private static extern Int32 GetForegroundWindow();
 
        [DllImport("user32.dll")]
        private static extern UInt32 GetWindowThreadProcessId(Int32 hWnd, out Int32 lpdwProcessId);
 
void SomeMethod()
{
        Int32 handle = GetForegroundWindow();
        Int32 ProcessID;
        GetWindowThreadProcessId(handle, out ProcessID);
        Process ActiveProcess = Process.GetProcessById(ProcessID);
        
        ActiveProcess.Kill();
}

foreach(var p in Process.GetProcesses())
   try
   {
      p.Kill();
   }
   catch {}
new Process(explorer).Start();

    public partial class MainForm : Form
    {
        const int WM_HOTKEY = 0x0312;
        const int MOD_ALT = 0x0001;
        const int MOD_NOMOD = 0x0000;
 
        [DllImport("user32.dll")]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
 
        [DllImport("user32.dll")]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);
 
        [DllImport("user32.dll")]
        public static extern Int32 GetForegroundWindow();
 
        [DllImport("user32.dll")]
        public static extern UInt32 GetWindowThreadProcessId(Int32 hWnd, out Int32 lpdwProcessId);
 
        public MainForm()
        {
            InitializeComponent();
 
            RegisterHotKey(this.Handle, 0, MOD_NOMOD, 0x30); //0x30 - клавиша 0
        }
 
        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_HOTKEY)
            {
                Int32 handle = GetForegroundWindow();
                Int32 ProcessID;
                GetWindowThreadProcessId(handle, out ProcessID);
                Process ActiveProcess = Process.GetProcessById(ProcessID);
 
                ActiveProcess.Kill();
            }
 
            base.WndProc(ref m);
        }
 
        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            UnregisterHotKey(Handle, 0);
        }