C# Online Test

The C# test has scenario-based MCQ questions to evaluate C# basics (variables, functions, types etc.), C# OOP concepts (classes and design patterns), efficient C# usage (exceptions handling, garbage collection etc.) and the ability to scale C# programs using Asynchronous programming. The test uses simple coding questions to evaluate hands-on C# programming knowledge.

Covered skills:

C# Basics
OOP concepts (Objects; Classes; Methods)
Inheritance and polymorphism
Dealing with Errors/ Exceptions and Nulls
Garbage Collector and Memory footprint
Structural and Creational Design Patterns
C# Multithreading
C# Networking

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About the C# Test

The C# Online 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:

Ability to write clean and maintainable C# code
Understanding of object-oriented programming concepts in C#
Proficiency in handling exceptions and errors effectively
Knowledge of inheritance and polymorphism in C#
Understanding the role of garbage collector in managing memory
Familiarity with structural and creational design patterns in C#
Ability to implement multithreading in C# applications
Knowledge of networking concepts in C#
Understanding of C# Basics
Proficiency in dealing with null values in C#

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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# Online Test will be non-googleable.

🧐 Question
Hard Classes and Constructors OOPs Polymorphism Object-oriented Programming	Solve
What is the output of the following C# code?
Easy Arrays and Exceptions Arrays Exceptions	Solve
What is the output of the following C# code?
Medium Multiple Namespaces Namespace Management	Solve
Class Student exists in both firstnamespace and secondnamespace namespaces. Which of the following are the correct ways to use the Student class?
Medium Static and constructors OOPs	Solve
What is the output of the following C# code?
Easy Registration Queue Logic Queues Sorting By Custom Order	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
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 Classes and Constructors OOPs Polymorphism Object-oriented Programming	2 mins C#	Solve
What is the output of the following C# code?
	Easy Arrays and Exceptions Arrays Exceptions	2 mins C#	Solve
What is the output of the following C# code?
	Medium Multiple Namespaces Namespace Management	2 mins C#	Solve
Class Student exists in both firstnamespace and secondnamespace namespaces. Which of the following are the correct ways to use the Student class?
	Medium Static and constructors OOPs	3 mins C#	Solve
What is the output of the following C# code?
	Easy Registration Queue Logic Queues Sorting By Custom Order	30 mins Coding	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	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
	Classes and Constructors OOPs Polymorphism Object-oriented Programming	C#	Hard	2 mins	Solve
What is the output of the following C# code?
	Arrays and Exceptions Arrays Exceptions	C#	Easy	2 mins	Solve
What is the output of the following C# code?
	Multiple Namespaces Namespace Management	C#	Medium	2 mins	Solve
Class Student exists in both firstnamespace and secondnamespace namespaces. Which of the following are the correct ways to use the Student class?
	Static and constructors OOPs	C#	Medium	3 mins	Solve
What is the output of the following C# code?
	Registration Queue Logic Queues Sorting By Custom Order	Coding	Easy	30 mins	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	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# Online Test?

The C# Online 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:

C# Basics
Understanding of OOP concepts (Objects, Classes, Methods)
Proficiency in Inheritance and Polymorphism
Dealing with Errors and Exceptions
Handling Nulls and Null Reference Exceptions
Understanding Garbage Collector and Memory Footprint
Knowledge of Structural and Creational Design Patterns
Experience with C# Multithreading
Understanding of C# Networking
Proficiency in C# Generics

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# Online Test?

C# Basics: C# Basics refers to the fundamental concepts and syntax of the C# programming language. It includes topics such as data types, variables, control structures, and basic input/output operations. This skill is measured in the test to assess the candidate's foundational understanding of C# development.

OOP concepts (Objects; Classes; Methods): OOP concepts in C# involve understanding the principles of object-oriented programming, including objects, classes, and methods. This skill is important to measure as it demonstrates the candidate's ability to design and implement modular and reusable code using object-oriented principles.

Inheritance and polymorphism: Inheritance and polymorphism are crucial concepts in OOP. In C#, inheritance allows classes to inherit properties and methods from parent classes, while polymorphism enables objects to take multiple forms. Evaluating this skill helps determine the candidate's proficiency in leveraging inheritance and polymorphism to create more flexible and scalable code.

Dealing with Errors/ Exceptions and Nulls: Handling errors, exceptions, and null values is essential in any robust software development process. This skill measures the candidate's ability to identify and handle potential runtime errors, exceptions, and null references in C# code, ensuring the application's stability and reliability.

Garbage Collector and Memory footprint: The Garbage Collector in C# automatically manages memory allocation and deallocation. It is responsible for reclaiming memory occupied by objects that are no longer in use. Understanding the Garbage Collector and keeping memory footprint in check is crucial for optimizing application performance and preventing memory leaks.

Structural and Creational Design Patterns: Structural and Creational Design Patterns provide reusable solutions to common software design problems. Evaluating this skill allows recruiters to assess the candidate's understanding of design patterns such as Singleton, Factory, and MVC, and their ability to apply these patterns to create flexible and maintainable code.

C# Multithreading: C# Multithreading involves executing multiple threads simultaneously to achieve concurrent execution and improve performance. Measuring this skill helps identify candidates who are proficient in writing efficient and thread-safe code, enabling them to leverage parallelism and optimize resource utilization in multi-threaded applications.

C# Networking: C# Networking involves developing applications that communicate over network protocols such as TCP/IP or UDP. This skill is important to measure as it assesses the candidate's ability to implement networking functionalities, handle client-server communication, and troubleshoot network-related issues in C# applications.

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# Online Test to be based on.

Variables

Data Types

Operators

Control Structures

Arrays

Strings

Functions

Classes

Objects

Methods

Inheritance

Polymorphism

Exception Handling

Null Checking

Garbage Collection

Memory Management

Structural Design Patterns

Creational Design Patterns

Multithreading

Thread Synchronization

Thread Pooling

Networking Basics

Socket Programming

HTTP/HTTPS Requests

Serialization

Deserialization

LINQ

Delegates

Events

Generics

Async/Await

Reflection

File I/O

XML Handling

JSON Handling

Database Connectivity

ADO.NET

Entity Framework

Exception Types

Custom Exception Handling

Delegate with Lambda Expressions

Attributes

Code Optimization

Unit Testing

Debugging

Version Control

C# Compiler Directives

Casting and Conversion

Generic Collections

Anonymous Types

Lambda Expressions

LINQ Query Expressions

Dependency Injection

Service Locator

TCP/IP Networking

Socket Options

Asynchronous Networking

What roles can I use the C# Online Test for?

C# Developer
C# Programmer
Senior C# Engineer
Software Developer (C#)
C# .NET Developer
System Analyst (C#)
Unity Programmer
Senior Software Engineer (C#)

How is the C# Online 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

Strong grasp of LINQ (Language Integrated Query)
Familiarity with Async and Await in C#
Experience with Unit Testing in C#
Knowledge of Reflection and Attributes in C#
Proficiency in Serialization and Deserialization in C#
Understanding of Event handling in C#
Familiarity with C# File I/O operations
Knowledge of Regular Expressions in C#
Experience with C# Web Services (WCF, ASP.NET Web API)
Understanding of Dependency Injection in C#

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

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Ready-to-use Tests

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Role-based Access

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Have questions about the C# Hiring Test?

What is the C# Online Test?

The C# Online Test assesses a candidate's knowledge and skills in C#. It is used by recruiters and employers to evaluate key areas in C# knowledge including object-oriented programming concepts, design patterns, and more.

Can I combine the C# Online Test with SQL questions?

Yes, recruiters can request a custom test that includes both C# and SQL skills. For more details, check out our C# & SQL Test.

What skills are covered in the C# Online Test?

The test covers C# Basics, OOP concepts, Inheritance and polymorphism, Error handling, Garbage Collection, Design Patterns, Multithreading, and Networking, among others.

How to use the C# Online Test in my hiring process?

You can use this test as a pre-screening tool at the initial stages of recruitment. Simply 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 test both C# and .NET together. This combination is recommended to get a comprehensive evaluation. Check out our C# & .NET Test.

What are the main C# tests?

Our main C# tests include the C# Online Test, C# & .NET Test, and C# & SQL Test.

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
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser
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.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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