using System;

public class Program

{

    public static void Main()

    {

        var myClass = new MyClass{

            prop1 = "Value 1",

            prop2 = "Value 2"

        };

        Console.WriteLine("Initial Value");

        Console.WriteLine("Prop1: " + myClass.prop1);

        Console.WriteLine("Prop2: " + myClass.prop2);

        SetValue1(myClass);

        Console.WriteLine("");

        Console.WriteLine("New Value (SetValue1)");

        Console.WriteLine("Prop1: " + myClass.prop1);

        Console.WriteLine("Prop2: " + myClass.prop2);

        myClass = new MyClass{

            prop1 = "Re-Value 1",

            prop2 = "Re-Value 2"

        };

        Console.WriteLine("");

        Console.WriteLine("==============================");

        Console.WriteLine("Re-init Value (SetValue2)");

        Console.WriteLine("Prop1: " + myClass.prop1);

        Console.WriteLine("Prop2: " + myClass.prop2);

        SetValue2(myClass);

        Console.WriteLine("");

        Console.WriteLine("New Value");

        Console.WriteLine("Prop1: " + myClass.prop1);

        Console.WriteLine("Prop2: " + myClass.prop2);

    }

    public static void SetValue1(MyClass myClass)

    {

        myClass.prop1 = "New Value 1";

        myClass.prop2 = "New Value 2";

    }

    public static void SetValue2(MyClass myClass)

    {

        //this will destroy the reference to myClass param, because it re-new-ed

        //the value of the param will have the same value with the value before

        //it come in (passed) to this method

        myClass = new MyClass();

        myClass.prop1 = "New Value 1";

        myClass.prop2 = "New Value 2";

    }

}

​

public class MyClass{

    public string prop1 {set; get;}

    public string prop2 {set; get;}

}