This one is not so obvious.  I was curious one day after using several utilities that wrote a percent complete to the command line.  I had never done this in C# so I went searching.  Here it is:

using System;
using System.Collections.Generic;
using System.Threading;

public class MyClass
{
    public static void Main()
    {
        for(int i = 0; i < 100;i++) {
            Console.Write("{0}% Complete\r", i);
            Thread.Sleep(100);
        
        }
    }
}

Running this code will produce an output like this:

Trick originally came from here:

http://www.dotnet247.com/247reference/msgs/6/31315.aspx