INTERFACE

Syntax:
public interfaceIList : ICollection, IEnumerable
{
int Add (object value);                // methods
bool Contains (object value);
...
bool IsReadOnly { get;}                // property
...
object this [int index] { get; set;}  // indexer}

�Interface = purely abstract class; only signatures, no implementation.

�May contain methods, properties, indexersand events
(no fields, constants, constructors, destructors, operators, nested types).

�Interface members are implicitly public abstract(virtual).

�Interface members must not be static.

�Classes and structs may implement multiple interfaces.�Interfaces can extend other interfaces