Chapter 6

Question 1

What is namespace

Answer 1

Let say we make a class. And if we want to make another class with same name then namespace address this problems of ours. It use is like this
using System;

Question 2

Can namespace hierarchical

Answer 2

Yes

Question 3

How we declare namespace

Answer 3

namespace csharp_station {}

Question 4

Does destructor and constructor have any return type

Answer 4

No. We can not have return type on destructor because of garbage collection

Question 5

Can we make constructor with arguments

Answer 5

Yes

Question 6

Can we make destructor with arguments

Answer 6

No

Question 7

Does C# provide default constructor and what is default constructor

Answer 7

Yes. Default constructor is when we do not make constructor then C# automatically creates constructor.

Question 8

What is static constructor

Answer 8

It invokes when a class first time loads. It does not have return type and does not have parameters.

Question 9

How many desctructors a class have

Answer 9

1

Question 10

How we derive a class from base class

Answer 10

ChildClass : ParentClass

Question 11

What constructor call first in inheritance

Answer 11

Parent class constructor first and then child class

Question 12

What is virtual keyword

Answer 12

When we use virtual keyword to a method then we tell that we want to use that method polymorphically. It means a method invokes where ever base or in derive. Virtual will call method from its original type, from where it originally declared either base or derived.