Chapter 8

Question 1

What is function pointer/delegate

Answer 1

Such a variable which contains the address of a function. A delegate in C# is similar to a function pointer in C or C++. Using a delegate allows the programmer to encapsulate a reference to a method inside a delegate object. The delegate object can then be passed to code which can call the referenced method, without having to know at compile time which method will be invoked. In fact, delegate is a variable the hold the reference of method.

Question 2

How we initialize delegate

Answer 2

new keyword

Question 3

Does event contains list of delegates

Answer 3

Yes

Question 4

What does System.Windows.Form do

Answer 4

Give us GUI

Question 5

What is try catch exception handling

Answer 5

Such a code where an exception code occur, we put it inside try block. And if exception occurs then also put it inside catch block.

Question 6

What is finally block in try catch

Answer 6

The code inside finally block have to execute in all cases whether exception raises or not.

Question 7

What happened if there is an exception and could not caught in try catch

Answer 7

OS will recognize it and program will crash. So there should not be uncaught exception.

Question 8

What is throw

Answer 8

Exceptions can be explicitly generated by a program using the throw keyword

Question 9

What is event registration

Answer 9

Adding a delegate in event list