Question

can we use field event in interface??
i use this and i do not get any error

class Program
{
    public delegate string MyDelegate(string a);
     public  static void Main(string[] args)
    {

    }
   public interface face
   {
       event MyDelegate ab;

  }
}

Answer 1

Interfaces cannot declare fields, but they can declare events.

• Interfaces (C# Programming Guide)

Interfaces consist of methods, properties, events, indexers, or any combination of those four member types. An interface cannot contain constants, fields, operators, instance constructors, destructors, or types.

See this tutorial for information on how to declare an event in an interface and then implement it in a class:

• How to: Implement Interface Events (C# Programming Guide)