What is Interface Can you say Example?

Yes,Interface is also one type like class but it is not class.Interface are used make standardization,decoupling,dynamic polymorphim.

Interface considerations:

Interface contains only declarations it doesn’t contain any deifications.

Interface members are by default à abstract members, as well as public members.

Interface doesn’t contain any fields.

Interface members should implement in derived classes.

Ex:    public interface ICollection : IEnumerable

    {

        int Count { get; } // Returns the number of elements contained in the

      

    }

	ICollection

                                

                           ArrayList :   ICollection

                           SortedList:  ICollection

                           Hashtable:  ICollection....................ect collections implement in their body definifications.

Like ArrayList, SortedList, Hashtable…ect collections implements the ICollection Interface.

Like Arraylist

class ArrayList : IList, ICollection, IEnumerable, ICloneable

    {

    public virtual int Count { get; } // Implemented here

}

Like the same way in the remaining collections SortedList,Hashtable..ect implements

    

From above example undersatand things

1.  Making Standarization--->Count

2.  Dynamic Loading---->As per Collection object