MCSD Programming in C# 1

Question 1

Which keyword in C# is used to prevent a class from being inherited?

Accepted Answer

sealed

Answer

The `sealed` keyword prevents a class from being used as a base class.

Question 2

What does the `async` keyword do when applied to a method in C#?

Accepted Answer

Marks the method as asynchronous, allowing use of await

Answer

The `async` modifier marks a method as asynchronous, enabling the `await` keyword within it.

Question 3

Which collection in C# is thread-safe and designed for concurrent scenarios?

Accepted Answer

ConcurrentDictionary<K,V>

Answer

`ConcurrentDictionary<K,V>` in the `System.Collections.Concurrent` namespace is designed for thread-safe access.

Question 4

What is the purpose of the `using` statement in C#?

Accepted Answer

Ensures IDisposable objects are properly disposed

Answer

The `using` statement ensures that `IDisposable` objects are disposed when the block exits, even on exceptions.

Question 5

Which access modifier makes a member accessible only within its own class?

Accepted Answer

private

Answer

The `private` modifier restricts access to the containing class only.

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