Change string using ref keyword : ref « Language Basics « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Language Basics
3. ref

using System;

class MainClass
{
  public static void UpperCaseThisString(ref string s)
  {
    s = s.ToUpper();
  }
  public static void Main() 
  {
    string s = "str";
    Console.WriteLine("-> Before: {0}", s);
    UpperCaseThisString(ref s);
    Console.WriteLine("-> After: {0}\n", s);
  }
}

-> Before: str
-> After: STR