In C# 2024, what is the latest feature for null-safety introduced in recent versions?

The correct answer is D: All of the above. C# has progressively introduced nullable reference types, required keyword (C# 11), and init-only properties (C# 9) for better null-safety and immutability.

What is the output of: string s = "Hello"; Console.WriteLine(s.GetHashCode() == s.GetHashCode());

The correct answer is A: true. GetHashCode() on the same string returns the same hash code value, so comparison is true. Strings are immutable in C#.

What is the output of the following code? var dict = new Dictionary(); dict[1] = "A"; dict[1] = "B"; Console.WriteLine(dict[1]);

The correct answer is B: B. Using the indexer on Dictionary with an existing key updates the value, not throws. Output is 'B'.

In a library management system, multiple types of items (Book, Magazine, DVD) share common properties like ID and Title. Which OOP principle should be applied here?

The correct answer is B: Inheritance. Inheritance allows creating a base class (LibraryItem) with common properties, and derived classes can inherit these properties, reducing code duplication.

Which collection type in C# is best suited for key-value pair storage with unique keys?

The correct answer is B: Dictionary. Dictionary stores key-value pairs and ensures unique keys. List stores ordered values, HashSet stores unique values only, Queue is FIFO.

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C# Programming
ASP.NET Basics

C# and .NET for campus placement

5 Q 4 Topics Take Mock Test

Difficulty: All Easy Medium Hard 1–5 of 5

Topics in C# Programming

All Basics & Syntax 100 OOP in C# 100 Collections 71 ASP.NET Basics 19

Q.1 Hard ASP.NET Basics

A developer needs to create a RESTful API that returns JSON data. Which ASP.NET approach is most suitable?

A ASP.NET Core Web API with [ApiController]

B ASP.NET Web Forms with controls

C Classic ASP with VBScript

D ASP.NET MVC Views only

Correct Answer: A. ASP.NET Core Web API with [ApiController]

EXPLANATION

ASP.NET Core Web API with [ApiController] attribute is the modern approach for building RESTful APIs that return JSON.

Test

Q.2 Hard ASP.NET Basics

In ASP.NET Core, which method is used to register services in the dependency injection container?

A services.AddScoped(), services.AddSingleton(), services.AddTransient()

B services.Register()

C services.Inject()

D services.Configure()

Correct Answer: A. services.AddScoped(), services.AddSingleton(), services.AddTransient()

EXPLANATION

AddScoped, AddSingleton, and AddTransient are methods to register services with different lifetimes in ASP.NET Core DI.

Test

Q.3 Hard ASP.NET Basics

An e-commerce application needs to handle concurrent user requests efficiently. Which ASP.NET Core feature is most suitable?

A Async/Await with Task-based operations

B Synchronous request processing

C Single-threaded execution

D Blocking I/O operations

Correct Answer: A. Async/Await with Task-based operations

EXPLANATION

Async/Await enables non-blocking I/O operations, allowing ASP.NET Core to handle more concurrent requests efficiently.

Test

Q.4 Hard ASP.NET Basics

What is the correct order of Page Lifecycle events in ASP.NET Web Forms?

A Init → Load → EventHandling → Render → Unload

B Load → Init → EventHandling → Render → Unload

C Init → Load → Render → EventHandling → Unload

D Load → Init → Render → EventHandling → Unload

Correct Answer: A. Init → Load → EventHandling → Render → Unload

EXPLANATION

ASP.NET Web Forms lifecycle: Init → Load → Event Handling (ViewState restored) → Render → Unload.

Test

Q.5 Hard ASP.NET Basics

A web application needs to store a user preference that persists across multiple browser sessions. Which state management technique is most appropriate?

A Database with user ID

B ViewState

C Session State

D Application State

Correct Answer: A. Database with user ID

EXPLANATION

For persistent data across multiple sessions, database storage is the best approach. Session State is temporary and Application State is server-wide.

Test

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