gistfile1.txt

using System;
using System.Runtime.InteropServices;


    class HighResolutionTimer
    {
        private bool isPerfCounterSupported = false;
        private Int64 frequency = 0;
        // Windows CE native library with QueryPerformanceCounter().
[DllImport("kernel32.dll", SetLastError = true)]
        private static extern int QueryPerformanceCounter(ref Int64 count);
[DllImport("kernel32.dll", SetLastError = true)]
        private static extern int QueryPerformanceFrequency(ref Int64 frequency);
        public HighResolutionTimer()
        {
            int returnVal = QueryPerformanceFrequency(ref frequency);
            if (returnVal != 0 && frequency != 1000)
            {
                // The performance counter is supported.
                isPerfCounterSupported = true;
            }
            else
            {
                // The performance counter is not supported. Use
                // Environment.TickCount instead.
                frequency = 1000;
            }
            Start();
        }

        public Int64 Frequency
        {
            get
            {
                return frequency;
            }
        }

        public Int64 Value
        {
            get
            {
                Int64 tickCount = 0;

                if (isPerfCounterSupported)
                {
                    // Get the value here if the counter is supported.
                    QueryPerformanceCounter(ref tickCount);
                    return tickCount;
                }
                else
                {
                    // Otherwise, use Environment.TickCount.
                    return (Int64)Environment.TickCount;
                }
            }
        }

        private Int64 _startValue;
        public void Start()
        {
            _startValue = Value;
        }

        public Int64 Stop()
        {
            Int64 stopValue = Value;
            return stopValue - _startValue;
        }
    }