[Baez]

You can use Interop to call _kbhit. The version of kbhit without the underscore is actually depricated. Make sure you use STAThread to ensure everything is synchronized; both COM and Windows objects.

using System;
using System.Runtime.InteropServices;

public class Win32Interop
{
   [DllImport("crtdll.dll")]
   public static extern int _kbhit();
}

class KBHIT
{
   [STAThread]
   static void Main(string[] args)
   {
      System.Console.WriteLine( "Press any key: " );
      while(!Win32Interop._kbhit());
   }
}