using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;

class Program
{
  [DllImport("user32.dll")]
  static extern void SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, uint uFlags);

  const int HWND_TOPMOST = -1;
  const int HWND_NOTOPMOST = -2;

  const int SWP_NOSIZE = 0x1;
  const int SWP_NOMOVE = 0x2;

  static IntPtr GetMainWindowHandle()
  {
    Process p = Process.GetCurrentProcess();
    if (p.MainWindowHandle != IntPtr.Zero) {
      return p.MainWindowHandle;
    }

    Assembly asm = Assembly.GetExecutingAssembly();
    string name = Path.GetFileNameWithoutExtension(asm.Location);
    PerformanceCounter pc = new PerformanceCounter("Process", "Creating Process Id", name);
    p = Process.GetProcessById((int)pc.RawValue);
    return p.MainWindowHandle;
  }

  static void Main()
  {
    IntPtr hWnd = GetMainWindowHandle();
    if (hWnd != IntPtr.Zero) {
      Console.WriteLine("TopMost");
      SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
    } else {
      Console.WriteLine("Handle not found");
    }
    Console.WriteLine("Press enter key to continue...");
    Console.ReadLine();
    if (hWnd != IntPtr.Zero) {
      Console.WriteLine("Not TopMost");
      SetWindowPos(hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
      Console.WriteLine("Press enter key to continue...");
      Console.ReadLine();
    }
  }
}