Programming

C# Interview Prep - Programming

This C# Interview Prep test evaluates your knowledge of ASP.NET Core framework, architecture, and best practices for building modern web applications.

Duration

Complete at your own pace or within the time limit

Questions

Multiple choice with one correct answer

Accuracy

Expert-reviewed questions with clear answer keys

Results

Instant detailed breakdown by topic area

Csharp - Asp Net Core
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About This Test

This assessment measures your proficiency with ASP.NET Core concepts and real-world development scenarios.

The test evaluates your understanding of ASP.NET Core fundamentals including middleware, dependency injection, routing, and the request pipeline. You'll be assessed on your ability to apply these concepts to build scalable and maintainable web applications.

Questions range from basic conceptual understanding to advanced implementation scenarios. Each question is designed to reflect challenges you'll encounter in professional development environments.

Use your results to identify knowledge gaps in ASP.NET Core and focus your study on areas where you need improvement. High scores indicate interview readiness for ASP.NET Core developer positions.

What You'll Practice

Collections and Data Structures

Choosing between List, Dictionary, HashSet, and arrays, understanding their performance, and using them with LINQ to solve problems efficiently.

Algorithms and Complexity

Implementing sorting, searching, and recursion in C#, and analyzing time and space complexity with Big O to justify your solutions.

Object-Oriented and Language Features

Explaining inheritance, interfaces, value versus reference types, boxing, and the difference between abstract classes and interfaces in C#.

C#-Specific Concepts

Discussing LINQ, async and await, delegates, garbage collection, and the difference between IEnumerable and IQueryable that interviewers commonly ask.

Sample Questions

A few real questions from this test, with answers and explanations. Take the full test above for the complete set.

What is boxing in C#?

Answer: Converting a value type into an object on the heap

Boxing allocates a heap object and copies a value type such as int into it so it can be treated as an object; unboxing extracts the value back.

What is the key difference between IEnumerable and IQueryable?

Answer: IQueryable builds an expression tree that a provider can translate, for example to SQL

IQueryable exposes queries as expression trees so providers like Entity Framework translate them to SQL and filter at the source, while IEnumerable evaluates in memory using delegates.

Which statement about a struct compared to a class in C# is correct?

Answer: A struct is a value type and does not support inheritance from another struct or class

Structs are value types with copy-by-value semantics and cannot inherit from other structs or classes, though they can implement interfaces.

What does the await keyword do when applied to a Task in C#?

Answer: It asynchronously waits, freeing the thread and resuming when the task finishes

await suspends the async method without blocking the thread, and the continuation runs once the awaited task completes, keeping the caller responsive.

How does an event differ from a plain public delegate field in C#?

Answer: An event restricts external code to only subscribe with += or unsubscribe with -=

The event keyword encapsulates a delegate so outside code can only add or remove handlers, while only the declaring type can raise the event.

Frequently Asked Questions

Find answers to common questions about this assessment

IEnumerable executes queries in memory using LINQ to Objects, pulling data and filtering locally. IQueryable builds an expression tree that a provider, such as Entity Framework, translates into a query executed at the source like a database. Using IQueryable lets filtering happen server-side, which is far more efficient for large datasets, a common interview distinction.

Boxing converts a value type to an object reference, allocating it on the heap, and unboxing extracts it back. This has a performance cost and happens implicitly, for example when storing an int in a non-generic collection or object. Generics avoid boxing by preserving the value type, which is why generic collections are preferred for performance.

The .NET garbage collector automatically reclaims memory from objects no longer reachable from your program. It uses a generational model that collects short-lived objects quickly and promotes survivors. You do not free managed memory manually, but you still dispose unmanaged resources with IDisposable, since the collector does not release those promptly or deterministically.

An abstract class can contain state and both implemented and abstract members, and a class inherits only one. An interface defines a contract that a class can implement alongside many others, and since C# 8 can include default implementations. Use an abstract class for shared base behavior and an interface to define capabilities across unrelated types.

Scores are based on the number of correct answers divided by total questions, with a breakdown by topic category.

Yes, questions are randomly selected and ordered from our question bank to ensure each attempt is unique.

No account is required. You can take the test immediately. Optionally provide an email to save your results.

There is no pass/fail threshold. The test measures your knowledge level and provides detailed feedback for improvement.

For knowledge tests, we recommend answering without external help to get an accurate assessment. Practice exercises are designed for learning, so references are acceptable.

Our questions are written for structured educational practice and can give a useful snapshot of your current knowledge in the tested topics.

Learn how our tests are designed, scored, and validated.

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