protected

suggest change

The protected keyword marks field, methods properties and nested classes for use inside the same class and derived classes only:

public class Foo()
{
    protected void SomeFooMethod()
    {
        //do something
    }

    protected class Thing
    {
        private string blah;
        public int N { get; set; }
    }
}

public class Bar() : Foo
{
    private void someBarMethod()
    {
        SomeFooMethod(); // inside derived class
        var thing = new Thing(); // can use nested class
    }
}

public class Baz()
{
    private void someBazMethod()
    {
        var foo = new Foo();
        foo.SomeFooMethod(); //not accessible due to protected modifier
    }
}

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