using System;

​

public class Program

{

    public static void Main()

    {

        //Create MyClass object

        var myClass = new MyClass();

        Console.WriteLine(myClass.msg);

​

        //Access static field with Class name prefix

        Console.WriteLine(MyClass.course);

    }

}

​

class MyClass

{

    public readonly string msg;

    public static readonly string course = "Welcome to C# basics";

​

    // Read-only fields can be assigned in constructor, but nowhere else.

    //Constructor

    public MyClass()

    {

        this.msg = "Hello World";

    }

​

    public void ChangeMsgValue(){

        // Error

        //msg = "Again Hello World";

    }

}