using System;

​

​

// Assembly2.cs

// Compile with: /reference:Assembly1.dll

public class DerivedClass: BaseClass

{

    static void Main()

    {

        var baseObject = new BaseClass();

        var derivedObject = new DerivedClass();

​

        // Error CS1540, because myValue can only be accessed by

        // classes derived from BaseClass.

        // baseObject.myValue = 10;

​

        // OK, because this class derives from BaseClass.

        derivedObject.myValue = 10;

    }

}

​

// Assembly1.cs

// Compile with: /target:library

public class BaseClass

{

   protected internal int myValue = 0;

}

​

class TestAccess

{

    void Access()

    {

        var baseObject = new BaseClass();

        baseObject.myValue = 5;

    }

}