using System;

​

public class Program

{

    public static void Main()

    {

        var state = new State();

        Console.WriteLine(state.ToString());

        state.Mutate();

        Console.WriteLine(state.ToString());

    }

}

​

public class State

{

    private int ValueTypeState;

    private string ReferenceTypeState;

    public State()

    {

        this.ValueTypeState = 0;

        this.ReferenceTypeState = "InitialState";

    }

​

    public void Mutate()

    {

        MutateState(() =>

        {

            ValueTypeState = 10;

            ReferenceTypeState = "ModifiedState";

        });

    }

​

    public override string ToString()

    {

        return "ValueType: " + ValueTypeState.ToString() + "\nReferenceType: " + ReferenceTypeState.ToString();

    }

​

    public static void MutateState(Action stateMutation)

    {

        stateMutation.Invoke();

    }

}