How to define an abstract class?
What interface must an object implement before it can be written to a stream as an object?
What is inheritance?
What does it mean that a method or class is abstract?
Can you create an instance for an abstract class?
In winform my controls [taskbar and progressbar] become inactive when heavy processing is going in background, how to avoid this via multithreading
Write a program to show the inheritance used in a class.
Is iterator a class or interface? What is its use?
Explain the concept of multiple inheritance (virtual inheritance). Write about its advantages and disadvantages?
What is the main difference between a class and an object?
What is the difference abstract class and interface?
What are associative classes?
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How to make a class accessible as a web service?