Ref, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class SampleClass
    {
        public string GetRefString(string refstring)
        {
            refstring="Before Call Calling Method, This is Chinna";
            Console.WriteLine(refstring);
            CalledMethod(ref refstring);
            Console.WriteLine(refstring);
            return refstring;
         }
        public string CalledMethod(ref string Value)
        {
            Value="After Call Calling Method, This is Chanti"   ;
            return Value;
        }
     }
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            SampleClass sc=new SampleClass();
            sc.GetRefString("Hi");
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,36 sec, absolute running time: 0,25 sec, cpu time: 0,23 sec, average memory usage: 13 Mb, average nr of threads: 2, absolute service time: 0,64 sec