我怎样才能（合理地）每N毫秒精确地执行一次动作？

using System;
using System.Runtime.InteropServices;

class Program {
    static void Main(string[] args) {
        timeBeginPeriod(1);
        uint tick0 = timeGetTime();
        var startDate = DateTime.Now;
        uint tick1 = tick0;
        for (int ix = 0; ix < 20; ++ix) {
            uint tick2 = 0;
            do {  // Burn 20 msec
                tick2 = timeGetTime();
            } while (tick2 - tick1 < 20);
            var currDate = startDate.Add(new TimeSpan((tick2 - tick0) * 10000));
            Console.WriteLine(currDate.ToString("HH:mm:ss:ffff"));
            tick1 = tick2;
        }
        timeEndPeriod(1);
        Console.ReadLine();
    }
    [DllImport("winmm.dll")]
    private static extern int timeBeginPeriod(int period);
    [DllImport("winmm.dll")]
    private static extern int timeEndPeriod(int period);
    [DllImport("winmm.dll")]
    private static extern uint timeGetTime();
}

timeBeginPeriod