MCSD Programming in C# 2

Question 1

In C#, what is boxing?

Accepted Answer

Converting a value type to a reference type (object)

Answer

Wrapping a class in an interface

Answer

Casting a reference type to a derived type

Answer

Allocating memory on the stack

Question 2

Which C# feature allows a method to accept a variable number of parameters?

Accepted Answer

params

Answer

ref

Answer

out

Answer

optional

Question 3

What is the default value of a bool field in a C# class?

Accepted Answer

false

Answer

true

Answer

null

Answer

0

Question 4

Which interface must a class implement to use it in a `foreach` loop in C#?

Accepted Answer

IEnumerable

Answer

IComparable

Answer

ICollection

Answer

IList

Question 5

What does the `virtual` keyword allow in C#?

Accepted Answer

Allows a method to be overridden in derived classes

Answer

Prevents method overriding

Answer

Creates an abstract method

Answer

Makes a method thread-safe

Question 6

Which statement correctly describes a C# delegate?

Accepted Answer

A type-safe function pointer

Answer

A class that wraps an interface

Answer

A static method that returns void

Answer

A struct that holds event data