using System;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Threading;
internal class HiPerfTimer
{
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceCounter(
out long lpPerformanceCount);
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceFrequency(
out long lpFrequency);
private long startTime, stopTime;
private long freq;
// Constructor
   public HiPerfTimer()
{
startTime = 0;
stopTime  = 0;
if (QueryPerformanceFrequency(out freq) == false)
{
// high-performance counter not supported
     throw new Win32Exception();
}
}
// Start the timer
   public void Start()
{
// lets do the waiting threads there work
    Thread.Sleep(0);
QueryPerformanceCounter(out startTime);
}
// Stop the timer
   public void Stop()
{
QueryPerformanceCounter(out stopTime);
}
// Returns the duration of the timer (in seconds)
   public double Duration
{
get
{
return (double)(stopTime - startTime) / (double) freq;
}
}
}
}
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;
namespace ConsoleApplication1
{
class Program
{
[DllImport("kernel32.dll")]
private static extern bool QueryPerformanceFrequency(ref   Int64 lpFrequency);
[DllImport("kernel32.dll")]
private static extern bool QueryPerformanceCounter(ref   Int64 lpPerformanceCount);
public static void Main(string[] args)
{
//long time;
//time = DateTime.Now.Ticks;
//Console.WriteLine(time);
            long frequency = 0;
if (!QueryPerformanceFrequency(ref   frequency))
{
Console.WriteLine("not   supported.");
return;
}
long start = 0;
if (!QueryPerformanceCounter(ref   start))
{
Console.WriteLine("query   start   failed.");
return;
}
Thread.Sleep(1000);
long end = 0;
if (!QueryPerformanceCounter(ref   end))
{
Console.WriteLine("query   end   failed.");
return;
}
Console.WriteLine("frequency   =   {0},   total   time   {1}",
frequency, (double)(end - start) / ((double)frequency));
}
}
}