using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

          string[] names = { "ashish", "abc", "xyz", "sdsd" };

            ref string name = ref names[1]; // ref local variable

           // ref string name = ref Find(names, "abc");

            name += "new name";

            Console.WriteLine("name : " + name);

            Console.WriteLine("all names: \n"+ string.Join(",",names));

            //name = ref names[2]; // error

            List<string> names2 = new List<string>() { "ashish", "abc", "xyz", "sdsd" };

            //ref string name2 = ref names2[1]; //error (ref cannot be assigned to complex variable)

            Console.ReadLine();

    }

     //ref return

​

        static ref  string Find(string[] names, string name)

        {

            for (int i=0; i < names.Length; i++)

            {

                if (names[i].Equals(name))

                    return ref names[i];

            }

            throw new Exception("name not found");

        }

}