C# (Coding): Data Structures & Objects Test

The C# (Coding): Data Structures & Objects Test evaluates a candidate's ability to work with data structures and object-oriented programming concepts in C#. It includes scenario-based MCQs and coding questions to assess knowledge of classes objects inheritance polymorphism abstract classes interfaces and common data structures like lists dictionaries stacks queues trees and graphs.

Covered skills:

Object Oriented Programming
Collections
Inheritance
Encapsulation
Polymorphism
Exception Handling
Generics
LINQ
Delegates and Events
Data Structures Implementation

Test Duration

30 mins

Difficulty Level

Moderate

Questions

5 C# MCQs
1 C# Coding Question

Availability

Ready to use

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About the C# (Coding): Data Structures & Objects Assessment Test

The C# (Coding): Data Structures & Objects Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Proficient in using C# syntax and structure
Able to implement object-oriented programming principles effectively
Demonstrate knowledge in creating and managing C# classes and objects
Able to utilize collections and data structures for optimized data handling
Experience with encapsulation to protect object integrity
Capable of implementing inheritance for creating hierarchical relationships
Proficient in using polymorphism to allow method overriding
Able to efficiently handle exceptions and errors
Demonstrate understanding of generics for type-safe data operations
Proficient with using LINQ for querying collections
Knowledge in implementing delegates for callback functions
Experience in handling events for building responsive applications
Able to construct data structures like lists, stacks, and queues
Exhibit skills in managing data using hash tables and dictionaries
Demonstrate skill in using asynchronous programming for performance optimization

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Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this C# (Coding): Data Structures & Objects Test will be non-googleable.

🧐 Question
Hard Signal Network	Solve
A secret communication network is built between cities. Each city sends out signals to others, but signals can only flow forward from a city with a lower signal strength to one with a higher signal strength. You are given: 1. An array "signals" where "signals[i]" represents the strength of city 'i'. 2. A list of "connections" (edges), where each connection [u, v] means a directed link from city 'u' to city 'v'. You must find the longest possible chain of cities where: 1. Each city is connected to the next (via directed edges). 2. The signal strengths are strictly increasing along the chain. Input: 1. An integer n → number of cities 2. An array signals of length n 3. An array of edges (directed connections between cities) Output: Print the length of the longest increasing-signal chain. Example: Input: n = 6 signals = [2, 4, 3, 5, 1, 6] edges = [[0,1], [0,2], [2,3], [1,3], [3,5], [4,0]] Output: 4 Explanation: Optimal path: 4 → 0 → 2 → 3 → 5 Signal strengths (strictly increasing) for the path: 1 → 2 → 3 → 5 → 6 Length: 5
Medium Visitors Count Strings Logic String Parsing Character Counting	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Hard Signal Network	30 mins Coding	Solve
A secret communication network is built between cities. Each city sends out signals to others, but signals can only flow forward from a city with a lower signal strength to one with a higher signal strength. You are given: 1. An array "signals" where "signals[i]" represents the strength of city 'i'. 2. A list of "connections" (edges), where each connection [u, v] means a directed link from city 'u' to city 'v'. You must find the longest possible chain of cities where: 1. Each city is connected to the next (via directed edges). 2. The signal strengths are strictly increasing along the chain. Input: 1. An integer n → number of cities 2. An array signals of length n 3. An array of edges (directed connections between cities) Output: Print the length of the longest increasing-signal chain. Example: Input: n = 6 signals = [2, 4, 3, 5, 1, 6] edges = [[0,1], [0,2], [2,3], [1,3], [3,5], [4,0]] Output: 4 Explanation: Optimal path: 4 → 0 → 2 → 3 → 5 Signal strengths (strictly increasing) for the path: 1 → 2 → 3 → 5 → 6 Length: 5
	Medium Visitors Count Strings Logic String Parsing Character Counting	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Signal Network	Coding	Hard	30 mins	Solve
A secret communication network is built between cities. Each city sends out signals to others, but signals can only flow forward from a city with a lower signal strength to one with a higher signal strength. You are given: 1. An array "signals" where "signals[i]" represents the strength of city 'i'. 2. A list of "connections" (edges), where each connection [u, v] means a directed link from city 'u' to city 'v'. You must find the longest possible chain of cities where: 1. Each city is connected to the next (via directed edges). 2. The signal strengths are strictly increasing along the chain. Input: 1. An integer n → number of cities 2. An array signals of length n 3. An array of edges (directed connections between cities) Output: Print the length of the longest increasing-signal chain. Example: Input: n = 6 signals = [2, 4, 3, 5, 1, 6] edges = [[0,1], [0,2], [2,3], [1,3], [3,5], [4,0]] Output: 4 Explanation: Optimal path: 4 → 0 → 2 → 3 → 5 Signal strengths (strictly increasing) for the path: 1 → 2 → 3 → 5 → 6 Length: 5
	Visitors Count Strings Logic String Parsing Character Counting	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

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Why you should use Pre-employment C# (Coding): Data Structures & Objects Test?

The C# (Coding): Data Structures & Objects Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Understanding basic object-oriented programming concepts.
Implementing data structures using C# collections.
Handling exceptions and errors effectively.
Utilizing encapsulation in class design.
Applying polymorphism in code architecture.
Using LINQ for data manipulation.
Working with delegates and events.
Implementing inheritance in class hierarchies.
Developing simple C# generic methods.
Understanding syntax and usage of C# language.

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the C# (Coding): Data Structures & Objects Test?

Object Oriented Programming: Object Oriented Programming (OOP) is a paradigm based on the concept of 'objects', which can contain data and code that manipulates the data. OOP is fundamental for creating modular and maintainable code, making it crucial for C# developers to master. This skill is indispensable for building scalable applications in C#, allowing for the creation of reusable and organized code structures.

Collections: Collections are data structures used to store, manage, and manipulate groups of objects. They provide an efficient way to handle data dynamically, enabling operations such as sorting and searching. Mastery of collections is essential for developers to create efficient algorithms that can handle complex data manipulation tasks.

Inheritance: Inheritance is an OOP feature that allows a new class to inherit the properties and behaviors of an existing class. This capability promotes code reusability and hierarchically organizes classes, facilitating easier maintenance and extension of code. It's a cornerstone of designing flexible and scalable systems.

Encapsulation: Encapsulation is the practice of bundling data and methods that operate on the data within one unit, typically a class, and restricting access to some of the object's components. This limits the interference and misuse of data, ensuring more robust and error-free code.

Polymorphism: Polymorphism allows objects to be treated as instances of their parent class rather than their actual class. In C#, it enables a single interface to represent different types, increasing the flexibility and integration of code components. Mastery of polymorphism ensures that a developer can maintain a clean, scalable codebase.

Exception Handling: Exception handling in C# is a mechanism to handle runtime errors, ensuring the program continues to operate smoothly. Proper management of exceptions is crucial for building resilient applications that gracefully recover from unexpected failures. Developers must effectively utilize try-catch-finally blocks to prevent crashes and ensure user-friendly applications.

Generics: Generics enable developers to define classes, interfaces, and methods with a placeholder for the type of data they store and manipulate, increasing code efficiency and reusability. By leveraging generics, C# developers can create flexible and type-safe data structures, critical for reducing redundancy and error rates in code.

LINQ: Language Integrated Query (LINQ) provides a consistent model for working with data across various sources in C#. It allows developers to write queries directly within the language, improving code readability and maintainability. Expertise in LINQ helps developers perform data manipulations with greater efficiency and clarity.

Delegates and Events: Delegates are objects that point to methods, allowing methods to be passed as parameters, while events provide a mechanism for broadcasting changes to interested listeners. Together, they enable the implementation of callback functions and provide a robust framework for event-driven programming in C#. Understanding these concepts is crucial for creating asynchronous and responsive applications.

Data Structures Implementation: Implementing data structures involves designing and using structures like arrays, lists, and trees to manage and organize data effectively. This skill is vital for optimizing performance and resource utilization in C#. A solid grasp of data structures ensures developers can tackle a range of computing challenges efficiently and effectively.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for C# (Coding): Data Structures & Objects Test to be based on.

C# Syntax

Data Types

Namespaces

Classes

Objects

Generics

Inheritance

Polymorphism

Encapsulation

Interfaces

Abstract Classes

Exception Handling

Try Catch

Finally

Collection Types

ArrayList

List

Dictionary

Queue

Stack

LinkedList

LINQ Queries

LINQ Operators

Delegates

Events

Event Handling

Lambda Expressions

Async Await

Task Parallel Library

String Manipulation

File I/O

Attributes

Reflection

Unit Testing

Debugging

Versioning

Assemblies

Properties

Indexers

Constructors

Destructors

Static Members

Overloading

Method Overriding

Access Modifiers

Extension Methods

Nullable Types

Type Casting

Threads

Delegates Func

Delegates Action

Anonymus Types

What roles can I use the C# (Coding): Data Structures & Objects Test for?

Software Developer
Backend Developer
Application Developer
Systems Engineer
Full Stack Developer
Web Developer
Game Developer
Mobile App Developer
DevOps Engineer
Data Engineer

How is the C# (Coding): Data Structures & Objects Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Designing complex systems with object-oriented principles.
Optimizing code with efficient data structures.
Applying advanced exception handling strategies.
Implementing complex inheritance and polymorphism.
Using advanced LINQ features for queries.
Handling events and delegates in real-time applications.
Creating robust and reusable generic classes.
Applying design patterns for code scalability.
Integrating C# APIs for data processing.
Refactoring legacy code in C# effectively.

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

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Have questions about the C# (Coding): Data Structures & Objects Hiring Test?

What is C# (Coding): Data Structures & Objects Test?

The C# (Coding): Data Structures & Objects Test assesses a candidate's skills in various data structures, classes, and object-oriented principles in C#. Recruiters use it to evaluate coding and problem-solving capabilities in C# for hiring developers.

Can I combine the C# (Coding): Data Structures & Objects Test with SQL questions?

Yes, recruiters can request a custom test that includes both C# coding and SQL questions. For details on how we assess SQL skills, check our C# & SQL Test.

What kind of questions are used to evaluate senior candidates in the C# (Coding): Data Structures & Objects Test?

The test includes topics like implementing binary trees, designing custom object-oriented structures, optimizing code for performance, and applying SOLID principles in C#.

How to use the C# (Coding): Data Structures & Objects Test in my hiring process?

Use this test as a pre-screening tool at the start of your hiring process. You can add a link to the assessment in your job post or invite candidates by email.

Can I test C# and .NET together in a test?

Yes, you can. We recommend our C# & .NET Test, which combines both skills for a comprehensive evaluation.

What are the main C# tests?

Here are some important C# tests:

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

Hidden AI Tools Detection with Honestly
Non-googleable questions
IP proctoring
Screen proctoring
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Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

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