using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace ConsoleApp21
{

    class Program
    {



        static void Main(string[] args)
        {
            Timer timer1 = new Timer("CDisplayEx", e) { Interval = 1000, Enabled = true };
            timer1.Tick += new System.EventHandler(timer1_Tick);

        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            StringBuilder sbBufferText = new StringBuilder(255);
            GetWindowText(GetForegroundWindow(), sbBufferText, sbBufferText.Capacity);
            Console.WriteLine("Foreground Window text = {0}", sbBufferText.ToString());
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);

        [DllImport("User32.dll", SetLastError = true)]
        public static extern IntPtr GetForegroundWindow();
    }
}