C# Subjective Questions And Answers

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C# Interview Questions And Answers

Page 4

Questions 16 What is the top .NET class that everything is derived from?

Answer
System.Object

Questions 17 When we can inherit a protected class-level variable?

Answer
Classes in the same namespace.

Questions 18 Does C# support multiple inheritance?

Answer
No directly,but we can use  interface for multiple inheritence

Answer
No directly,but we can use  interface for multiple inheritence

Questions 19 How do you inherit from a class in C#?

Answer
Place a colon and then the name of the base class. 
exmple:-
       class a
{}
class b: a //inherit class a
{}

Questions 20 What is an abstract class?

Answer
Abstract class:-Use the abstract modifier in a class declaration to indicate that a class is intended only to be a base class of other classes.

Abstract classes have the following features: 

1-An abstract class cannot be instantiated. 
2-An abstract class may contain abstract methods and accessors. 
3-It is not possible to modify an abstract class with the sealed modifier, which means that the class cannot be inherited. 
4-A non-abstract class derived from an abstract class must include actual implementations of all inherited abstract methods and accessors. 
Abstract class have complete and non complete member and methods.
Example:- abstract class a
{
int a;
public abstract void print();
}