C# and .NET Online Test

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About the test

The C# and .NET online test assesses knowledge of the .NET framework and its class library. This test includes live coding tasks in the C# programming language as it is the most used language for .NET.

The assessment includes work-sample tasks such as:

  • Working with classes, objects, and interfaces to write reusable code.
  • Implementing and properly using algorithms and data structures to optimize application performance.
  • Using the Async-Await pattern to work with asynchronous code.

A good .NET developer needs a solid understanding of the C# programming language and the .NET framework class library in order to write robust and maintainable code.

Sample public questions

Easy
20 min
code
Public
AI-resistant
C#
Arrays
Iteration

Your company is analyzing malware which targets numerical record files.

The malware uses a sliding window over the array of numbers in a file, and tries to match the following pattern:

Tl, -, -, X, -, -, -, Tr

The entire window is moved so that 'X' passes through all the values and is compared to the numbers at the 'Tl' and 'Tr' locations, which are positioned at a constant offset to 'X'.

The malware has the following rules:

  • If the value at the 'Tl' or 'Tr' position of the pattern is bigger or equal to the value at the 'X’ position, the malware replaces the value at 'X' with 0.
  • If the value at the 'Tl' or 'Tr' offset is out of bounds, then the value at 'X' is only compared to the other existing value.
  • The record is processed in two stages: first, all the positions that should be set to 0 are located, using the original values for comparison. Only after all positions have been identified do they get set to 0.

For example, if the values in a record file are the following:

new int[] { 1, 2, 0, 5, 0, 2, 4, 3, 3, 3 }

The expected values after the malware runs are:

new int[] { 1, 0, 0, 5, 0, 0, 0, 3, 3, 0 }

In this example, both '2's, the '4' and the last '3' were replaced by 0.

Implement the Simulate method so that the malware behavior is replicated for further study.

Easy
5 min
mca
Public
AI-resistant
.NET
LINQ

Consider the following code:

C#

public class RecyclingBin
{
    protected List<string> recyclables = new List<string>();
    
    public void Add(string recyclable)
    {
        if (recyclable.Split(' ').Length > 1 && recyclable.Split(' ')[1].Length > 3)
        {
            recyclables.Add(recyclable);
        }
    }
    
    public List<IGrouping<string, string>> SortRecyclables()
    {
        return recyclables.GroupBy(recyclable => recyclable.Split(' ').First()).ToList();
    }
}

VB.NET

Public Class RecyclingBin
    Protected recyclables As List(Of String) = New List(Of String)
    
    Public Sub Add(recyclable As String)
        If recyclable.Split(" ").Length > 1 And recyclable.Split(" ")[1].Length > 3
            recyclables.Add(recyclable)
        End If
    End Sub

    Public Function SortRecyclables()
        Return recyclables.GroupBy(Function(recyclable) recyclable.Split(" ").First()).ToList()
    End Function
End Class

Select the statements that are true if a new RecyclingBin is instantiated and the Add method is called with the following recyclable parameters: "metal pipe", "plastic toy", "metal bar", "copper wire", "plastic button", "wire", and "brass".

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81 more premium C# and .NET questions

Enum, String, NET Versions, Order Chars, Max Sum, Integer to Object, Product Refactoring, Sort Params, Sum of Numbers, Delayed Print, Third Party Components, String Operations, Racer, Read First Line, Prefix, Chinese Box, Car Rental, Eye of the Storm, Document Store, Snapshot, Moving Total, Driver Exam, Classroom, Username, Weighted Average, Kilometer Converter, Document Counter, Disposable Wrapper, Platformer, String Occurrence, Hobbies, Language Teacher, Read Write Execute, Node, Friend, Internal Nodes, Crop Ratio, Unique Numbers, Wheel Defects, Log Parser, Shelf Test, Chain Link, Worker, Veterinarian, Window Manager, Ceramic Store, Stories, Paper Strip, Segment, Procedural Generator, Flight Connections, Nullable Employee, Citizen Income, Vectors, Date Transform, Book Sale, Blog Posts, Construction Game, Calories Burned, XML Navigation, Shipping, Memory Leak, Gearbox, Planet Search, Company Stock, Digital Flasks, Airport Networks, Patient Class, Patient Class, Unique Product, Ingredient Tuple, Stack to List, Log Patch, Circuit Simulator, Fire Dragon, Shining Star, Chemical Machine, Bicycle, Flimsy Ladder, Paragraph, Animal Hierarchy.

Skills and topics tested

  • .NET
  • Enum
  • Class Library
  • CLR
  • LINQ
  • C#
  • Algorithmic Thinking
  • Boxing and Unboxing
  • Memory Management
  • Accessibility Levels
  • OOP
  • Refactoring
  • Pass by Reference
  • Async-Await
  • Multithreading
  • Package Manager
  • StringBuilder
  • Synchronization
  • Exceptions
  • Data Structures
  • Sorting
  • Bug Fixing
  • Language
  • Lists
  • HashSet
  • Properties
  • Regex
  • Strings
  • Arithmetic
  • Inheritance
  • Method Overriding
  • Destructors
  • Linked List
  • Stream
  • Dictionary
  • Iteration
  • Recursion
  • Tree
  • Graphs
  • Arrays
  • Integer Division
  • Serialization
  • XML
  • Test Case Design
  • Unit Testing
  • Queue
  • Dynamic Programming
  • Random
  • Null Coalescing Operator
  • Null Conditional Operator
  • Entity Framework
  • Eager Loading
  • Lazy Loading
  • Dynamic Objects
  • Conditions
  • AI Code Review
  • Conditional Statements
  • Loops
  • 2D Array
  • Abstract Class
  • Tuples
  • Complexity
  • Stack
  • Extension Methods
  • Higher Order Function
  • Interfaces
  • TDD
  • Field Modifiers

For job roles

  • .NET Developer
  • Back-End Developer
  • C# Developer
  • Web Developer

Sample candidate report

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Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

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Product reviews

G2 - Crowd Badge
G2 - High Performer (2022)
Capterra - 4.5 Stars
Capterra - Shortlist (2023)

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