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About the test:

The C# SQL Test uses scenario-based MCQs to evaluate candidates on their understanding of C# programming language and SQL databases. The test assesses candidates on their knowledge of C# syntax, object-oriented programming (OOP) concepts, and .NET framework, as well as their ability to write and debug C# code. It also evaluates their familiarity with SQL syntax and usage, SQL commands for creating, querying, and modifying relational databases and tables, database design, normalization, and indexing, and their ability to write efficient and optimized SQL queries in C#.

Covered skills:

  • C# Syntax Basics
  • C# Data structures
  • SQL Joins and Indexes
  • C# OOPs
  • SQL CRUD Operations
  • C# Programming

9 reasons why
9 reasons why

Adaface C# & SQL Test is the most accurate way to shortlist C# Developers



Reason #1

Tests for on-the-job skills

The C# & SQL 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:

  • Understanding and implementing C# syntax basics
  • Applying object-oriented programming concepts in C#
  • Working with various data structures in C#
  • Performing CRUD operations in SQL
  • Utilizing joins and indexes effectively in SQL
  • Applying C# programming skills in real-world scenarios
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
Reason #3

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 10,000+ questions. The actual questions on this C# & SQL Test will be non-googleable.

🧐 Question

Hard

Classes and Constructors
OOPs
Solve
What is the output of the following C# code?
 image

Easy

Arrays and Exceptions
Arrays
Exceptions
Solve
What is the output of the following C# code?
 image

Medium

Multiple Namespaces
Solve
Class Student exists in both firstnamespace and secondnamespace namespaces. Which of the following are the correct ways to use the Student class?
 image

Medium

Static and constructors
OOPs
Solve
What is the output of the following C# code?
 image

Medium

Multi Select
JOIN
GROUP BY
Solve
Consider the following SQL table:
 image
How many rows does the following SQL query return?
 image

Medium

nth highest sales
Nested queries
User Defined Functions
Solve
Consider the following SQL table:
 image
Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
 image

Medium

Select & IN
Nested queries
Solve
Consider the following SQL table:
 image
Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
 image

Medium

Sorting Ubers
Nested queries
Join
Comparison operators
Solve
Consider the following SQL table:
 image
What will be the first two tuples resulting from the following SQL command?
 image

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions
Solve
Consider the following SQL table:
 image
How many tuples does the following query return?
 image

Easy

Registration Queue
Logic
Queues
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
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

2 mins

C#
Solve

Easy

Arrays and Exceptions
Arrays
Exceptions

2 mins

C#
Solve

Medium

Multiple Namespaces

2 mins

C#
Solve

Medium

Static and constructors
OOPs

3 mins

C#
Solve

Medium

Multi Select
JOIN
GROUP BY

2 mins

SQL
Solve

Medium

nth highest sales
Nested queries
User Defined Functions

3 mins

SQL
Solve

Medium

Select & IN
Nested queries

3 mins

SQL
Solve

Medium

Sorting Ubers
Nested queries
Join
Comparison operators

3 mins

SQL
Solve

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions

2 mins

SQL
Solve

Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Classes and Constructors
OOPs
C#
Hard2 mins
Solve
Arrays and Exceptions
Arrays
Exceptions
C#
Easy2 mins
Solve
Multiple Namespaces
C#
Medium2 mins
Solve
Static and constructors
OOPs
C#
Medium3 mins
Solve
Multi Select
JOIN
GROUP BY
SQL
Medium2 mins
Solve
nth highest sales
Nested queries
User Defined Functions
SQL
Medium3 mins
Solve
Select & IN
Nested queries
SQL
Medium3 mins
Solve
Sorting Ubers
Nested queries
Join
Comparison operators
SQL
Medium3 mins
Solve
With, AVG & SUM
MAX() MIN()
Aggregate functions
SQL
Hard2 mins
Solve
Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve
Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!


Brandon Lee, Head of People, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment C# & SQL Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the C# & SQL Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring


Learn more

About the C# & SQL Assessment Test

Why you should use Pre-employment C# & SQL Online Test?

The C# & SQL 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# Syntax Basics
  • C# OOPs
  • C# Data structures
  • SQL CRUD Operations
  • SQL Joins and Indexes
  • C# Programming
  • Exception handling in C#
  • Object-oriented design principles in C#
  • Understanding and implementing algorithms in C#
  • Relational database concepts and design in SQL

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# & SQL Online Test?

  • C# Syntax Basics

    C# Syntax Basics refers to the foundational rules and structure used to write C# code. This includes understanding data types, variables, operators, control structures, and basic input/output operations. Assessing this skill ensures that candidates have a solid understanding of the fundamental building blocks of C# programming.

  • C# OOPs

    C# OOPs (Object-Oriented Programming) involves designing and creating classes, objects, and their interactions to solve real-world problems. This skill measures a candidate's ability to utilize object-oriented principles such as encapsulation, inheritance, and polymorphism to develop flexible and modular code.

  • C# Data structures

    C# Data structures are containers for organizing and storing data efficiently. This includes arrays, lists, queues, stacks, and dictionaries. Evaluating this skill helps assess a candidate's understanding of the different types of data structures and their application in solving complex programming challenges.

  • SQL CRUD Operations

    SQL CRUD (Create, Read, Update, Delete) Operations involve manipulating data stored in a database. This skill tests a candidate's proficiency in writing SQL statements to perform operations such as inserting records, retrieving data, updating existing records, and deleting records from database tables.

  • SQL Joins and Indexes

    SQL Joins and Indexes are important concepts in database management that facilitate efficient and optimized data retrieval. This skill measures a candidate's ability to write SQL queries that involve joining tables based on common columns and utilizing indexes to improve query performance.

  • C# Programming

    C# Programming assesses a candidate's overall knowledge and proficiency in the C# programming language. This includes a combination of syntax, object-oriented concepts, data structures, and problem-solving skills. Evaluating this skill provides recruiters with a comprehensive understanding of a candidate's ability to develop applications using C#.

  • 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# & SQL Test to be based on.

    C# variables
    C# data types
    C# operators
    C# conditional statements
    C# loops
    C# arrays
    C# lists
    C# dictionaries
    C# classes
    C# inheritance
    C# interfaces
    C# polymorphism
    C# encapsulation
    C# abstraction
    C# exception handling
    SQL CREATE statement
    SQL INSERT statement
    SQL SELECT statement
    SQL UPDATE statement
    SQL DELETE statement
    SQL JOIN
    SQL INNER JOIN
    SQL OUTER JOIN
    SQL INDEX
    SQL Primary Key
    SQL Foreign Key
    SQL Group By
    SQL Order By
    SQL Subqueries
    C# LINQ
    C# Lambda expressions
    C# Delegates
    C# Events
    C# Nullable types
    C# Generics
    C# Multithreading
    SQL Transactions
    SQL Stored Procedures
    SQL Views
    C# File IO
    C# Serialization
    C# Reflection
    C# Regular Expressions
    SQL Aggregation functions
    SQL Normalization
    C# Unit Testing
    C# Debugging
    SQL Triggers
    C# Error handling
    SQL Subqueries
    C# Exception handling
    SQL Constraints
    C# Code optimization
    C# Memory management
    SQL Stored Functions
    C# Event-driven programming
    C# Design patterns
    C# Web services
    SQL Views
    C# Networking
    C# Database connectivity
    SQL Joins
    C# GUI development
    C# Entity Framework
    SQL Performance tuning

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

  • C# Developer
  • SQL Database Administrator

How is the C# & SQL 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

  • Optimizing SQL queries for performance
  • Database normalization and denormalization in SQL
  • Working with collections and generics in C#
  • Understanding and using LINQ in C#
  • Working with stored procedures in SQL
  • Understanding and implementing inheritance in C#
  • Understanding and using indexing in SQL
  • Implementing multithreading and asynchronous programming in C#
  • Understanding and using transactions in SQL
  • Testing and debugging in C#

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

Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.


85%
reduction in screening time

C# & SQL Hiring Test FAQs

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:

  • 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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