Inheritance design using Interface + abstract class. Good practice?

Question

I\'m not really sure how to title this question but basically I have an interface like this:

public interface IFoo
{
    string ToCMD();
}

a co

Answer 1

You could also just use interfaces. There is no reason to use an abstract class.

public interface Foo : IFoo
{
}

 public interface  Bar : IFoo
{
}