C# : Abstract Vs Interface : Part 12

• Abstract class can have implementation for some of its members. But interface cannot have implementation for any of its members.
• Abstract can have fields while interface cannot have fields.
• Abstract class can inherit from any other abstract class or interface, where as interface can inherit only from interface.
• Abstract class members can have modifiers where as interface class members cannot have modifiers.

e.g.

//Interface example

    public interface Interface1

    {

        void AddNumbers(int a, int b);

    }

//Abstract class example

    public abstract class Abstract1

    {

        public abstract int AddNumbers(int a, int b);

    }