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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void DoSomethingByValue(string str)
        {
            str = "Changed!";
        }
        
        public static void DoSomethingByReference(ref string str)
        {
            str = "Changed!";
        }
        
        public static void Main(string[] args)
        {
            var testVal = "Original string";
            Console.WriteLine("Before passing by value: " + testVal);
            
            DoSomethingByValue(testVal);
            Console.WriteLine("After passing by value: " + testVal);
            
            
            var testRef = "Original string";
            Console.WriteLine("Before passing by reference: " + testRef);
            
            DoSomethingByReference(ref testRef);
            Console.WriteLine("After passing by reference: " + testRef);
        }
    }
}

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Compilation time: 0.09 sec, absolute running time: 0.06 sec, cpu time: 0.05 sec, average memory usage: 15 Mb, average nr of threads: 4