C# Exclusive Interview Questions and Answers (453) - Page 15

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When a non virtual method of Parent class if written in child class then it is said to be _________ the parent class method

NOTE: This is objective type question, Please click question title for correct answer.

When a non virtual method of Parent class if written in child class then it is said to be _________ the parent class method

NOTE: This is objective type question, Please click question title for correct answer.

class CA { private void Foo() { } } class CB : CA { public ________ void Foo() { } } Which of the following are valid

NOTE: This is objective type question, Please click question title for correct answer.

Every method of child class which is declared as "new" can also be declared as

NOTE: This is objective type question, Please click question title for correct answer.

Only those overridden methods which are declared as or in the parent class can declare as sealed.

virtual,override

Can we redeclare a instance variable in child class if with same name it is already declared in parent class.

yes it must be declared as new (showing the parent class instance variable)

Does .net support Multiple Inheritance

Yes. It supports through Interface.

What all access specifiers are allowed when we are explicitly implementing interfaces

Explicitly implemented method should not have any access specifier because they anyhow cannot never be invoked explicitly using a variable of a class in
which they are implemented.They can be invoked only using reference variable of type interface.

Why an instance can't be created for an abstract class

An
Instance of Abstract class cannot be created because an abstract class
may (not compulsory) have some abstract members i.e. members whose
declaration is provided and implementation is not and if the instance of
this class is created, that abstract method would be invoked and it
doesnt have implementation and this would create a problem.

To avoid this kind of problem the compiler gives error if we try to
create the instance of abstract class (which can also be said as
incomplete class)