Answer Posted / sudhir gaddam

The class,which does not support object creation is called
as abstract class...i.e,abstract class cannot be
instantiated.Abstract class should have atleast one
abstract method.Abstract class can have ordinary methods
(concrete methods).Abstract class can have abstract
methods,ordinary
methods,fields,properties,constructors,destructors and
constants.Abstract class can inherit class
and one or more interfaces.In vb.net abstract can be called
as must inherit class.Abstract class is faster then
interface.Abstract class can contain default code and
complete code.Abstract class can contain method
implementations.

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