using System;

public class Program {

    public static void Main() {

        var myInstance = new SubClass();

        int myOutputInt = myInstance.MyFunction();

        Console.WriteLine("My output: " + myOutputInt);

    }

}

​

public class BaseClass {

    public int myInt = 10;

    public virtual int MyFunction(){

        return myInt;

    }

}

public class SubClass : BaseClass {

    public int myInt = 20;

    public override int MyFunction(){

        // variable names will be checked like so:

        // - local variables first (defined in-function, or function parameters. i.e. myInt right below us)

        // - class members next (fields that belong to the class we're inside of. i.e. SubClass)

        // - base class members (fields that belong to the base class we've inherited, i.e. BaseClass)

        // explicitly refer to BaseClass's myInt:

        // return base.myInt;

        // explicitly refer to SubClass's myInt:

        // return this.myInt;

        int myInt = 30;

        return myInt;

    }

}