using System;

using System.Diagnostics;

using System.Threading;                 

​

public class Program

{

    public static void Main()

    {

        var startTime = Stopwatch.GetTimestamp();

        Thread.Sleep(1000);

        var requestTime = TimeSpan.FromTicks(Stopwatch.GetTimestamp() - startTime).TotalMilliseconds;

        Console.WriteLine(requestTime);

        Console.WriteLine($"{requestTime:0.000} ms");

    }

}