Logning af aktive program(er)

Jeg brugte C# kode:

using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Timers;


using System.Windows.Forms;
using gma.System.Windows;
using System.Runtime.InteropServices;
using System.Threading;
using System.Reflection;


  [DllImport("user32.dll")]
        static extern int GetForegroundWindow();

        [DllImport("user32.dll")]
        static extern int GetWindowText(int hWnd, StringBuilder text, int count);


        private string GetActiveWindow()
        {

            const int nChars = 256;
            int handle = 0;
            string retValue = "";
            StringBuilder Buff = new StringBuilder(nChars);

            handle = GetForegroundWindow();

            if (GetWindowText(handle, Buff, nChars) > 0)
            {
                retValue = Buff.ToString();
                //this.txt1.Text = handle.ToString();
            }

            return retValue;
        }