using System;

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public class Program

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{

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    public static void Main()

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    {

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        var quiz = new Quiz{Prop1 = 1};

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        QuizChange(quiz);

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        Console.WriteLine(quiz);

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        QuizChange2(quiz);

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        Console.WriteLine(quiz);        

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    }

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    public static void QuizChange(Quiz quiz)

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    {

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        var quizNew = quiz;

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        quizNew.Prop1 = 2;

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    }

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    public static void QuizChange2(Quiz quiz)

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    {

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        quiz = new Quiz{Prop1 = 3};

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    }

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    public class Quiz

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    {

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        public int Prop1 {get;set;}

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        public override string ToString()

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        {

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            return Prop1.ToString();

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        }

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    }

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}