using System;

​

public class Program

{

    public static void Main()

    {

        MyClass mc = new MyClass(50);

        mc.ChangeVal(45);

        mc.Display();

        Console.WriteLine("MyClass.constvar = {0}", MyClass.constvar);

        Console.WriteLine("MyClass.staticvar = {0}", MyClass.staticvar);

    }

}

​

public class MyClass

{

    public readonly int readonlyvar1 = 10, readonlyvar2;

    public const int constvar = 20;

    public static int staticvar = 0;

    public MyClass(int i)

    {

        readonlyvar2 = i; // valid

        //z = i; //compile-time error

        staticvar = i; // valid

    }

​

    public void ChangeVal(int val)

    {

        //x = val;

        //z = i; //compile-time error

        staticvar = val; // valid

    }

​

    public void Display()

    {

        Console.WriteLine(staticvar);

        Console.WriteLine(readonlyvar1);

        Console.WriteLine(constvar);

    }

}