using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

​

        // Collection of objects

        IList<Test> initialCollection = new List<Test>();

        initialCollection.Add(new Test(){ Value = 30});

        Console.WriteLine("Before update method : " + initialCollection.Last().Value );

        UpdateValueCollection(initialCollection);

        Console.WriteLine("After update method : " + initialCollection.Last().Value );

        IList<Test> check = new List<Test>();

        check.Add(new Test(){ Value = 100});

        initialCollection = check;

        Console.WriteLine("Same update method code added as consecutive line : " + initialCollection.Last().Value );

    }

    public static void UpdateValueCollection(IList<Test> lstTest)

    {

        IList<Test> check = new List<Test>();

        check.Add(new Test(){ Value = 100});

        lstTest = check;

    }

}

​

public class Test

{

    public int Value {get; set;}

}