C# and .NET Online Test
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The C# and .NET online test assesses candidates' knowledge of programming in the C# language and their knowledge of the .NET Framework.
It's an ideal test for pre-employment screening. A good C# developer, capable of working on the back-end or the full-stack of an application, needs to be able not only to solve problems using C# but also to leverage the utilities and classes provided by the .NET Framework.
This online test requires candidates to solve coding problems in C# and answer questions about the features of the .NET Framework.
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Free Sample Questions for C# and .NET Test
Our sample questions are free for companies to use on a trial plan. See more about our premium questions for paid plans below.
Integer
1min
-
Easy
Easy
-
MCA
.NET
Class Library
Public
.NET
The .NET framework, developed by Microsoft, provides a large class library and language interoperability. This makes it an essential skill for a programmer working with a Microsoft stack.
Class Library
Reusing a properly engineered and thoroughly tested class library is the best way to keep your code concise, performant and reliable.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
Which statements are true for an int/Integer built in .NET data type?
(Select all acceptable answers.)
Cache Casting
3min
-
Easy
Easy
-
MCA
C#
Inheritance
OOP
New
Public
C#
The C# programming language is a simple, modern, general-purpose, object-oriented programming language. Having a basic familiarity with the programming language used on the job is a prerequisite for quickly getting up to speed.
Inheritance
In object-oriented programming, inheritance is the mechanism of basing a class upon another class, retaining similar implementation. Inheritance allows programmers to reuse code and is a must know topic for every programmer who works with OOP languages.
OOP
Object-oriented programming is a paradigm based on encapsulating logic and data into objects, which may then contain fields and procedures. Many of the most widely used programming languages are based on OOP, making it a very important concept in modern programming.
New
This is a new addition to our question library.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
A company is designing the class hierarchy for various cache implementations:
public class Cache {}
public class DiskCache : Cache {}
public class MemoryCache : Cache {}
public class OptimizedDiskCache : DiskCache {}
Select all the answers that will result in a runtime exception.
(Select all acceptable answers.)
Inheritance
2min
-
Easy
Easy
-
MCA
.NET
Class Modifiers
Method Modifiers
OOP
Public
.NET
The .NET framework, developed by Microsoft, provides a large class library and language interoperability. This makes it an essential skill for a programmer working with a Microsoft stack.
Class Modifiers
Class modifiers like abstract, final, or static should be used to specify how a class should be used and what is allowed or not allowed to be done with it. This is an essential topic for OOP programming.
Method Modifiers
Method modifiers like static, override, or final should be used to specify how a method can be used or what its relationship is compared to its base class. This is an essential topic for OOP programming.
OOP
Object-oriented programming is a paradigm based on encapsulating logic and data into objects, which may then contain fields and procedures. Many of the most widely used programming languages are based on OOP, making it a very important concept in modern programming.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
A class inherits a base class and it overrides a method from that base class.
Select all possible forms of the base class and its method:
(Select all acceptable answers.)
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Premium Questions for C# and .NET Test
TestDome offers a premium questions library with 1000+ unique, hand-crafted questions whose answers can’t be found online. If you spot an answer somewhere online, we’ll give you a refund.
Question Names
These premium questions are included in this pre-built test and can be added to any multi-skill test. Please sign up for a paid plan to view the questions in detail.
Driver Exam, Enum, Read First Line, String, NET Versions, Order Chars, Document Store, Max Sum, Log Patch, Shipping, Procedural Generator, Chain Link, Classroom, Disposable Wrapper, Document Counter, Veterinarian, Eye of the Storm, Gearbox, Hobbies, Integer to Object, Memory Leak, Node, Paragraph, Platformer, Product Refactoring, Snapshot, Sort Params, Unique Numbers, Username, Weighted Average, Window Manager, Language Teacher, Book Sale, Friend, Sum of Numbers, Shelf Test, Delayed Print, Stories, Prefix, Third Party Components, Adder, Moving Total, Shining Star, String Operations, Car Rental, Paper Strip, Crop Ratio, Bicycle, Nullable Employee, Patient Class, Kilometer Converter, Stack to List, Internal Nodes, Fire Dragon, Log Parser, Ingredient Tuple, Animal Hierarchy, Chinese Box, String Occurrence, Worker, Date Transform, Racer, Unique Product, Flight Connections, XML Navigation, Wheel Defects, Segment, Blog Posts, Citizen Income, Read Write Execute, VectorsCovered Skills
Testing of these skills is covered in this pre-built test because they’re closely related. On our paid plan, you can easily create your own custom multi-skill tests.
C#C#
The C# programming language is a simple, modern, general-purpose, object-oriented programming language. Having a basic familiarity with the programming language used on the job is a prerequisite for quickly getting up to speed.
Exceptions
Exceptions exist in most modern programming languages, making it important for a programmer to understand them and know how to handle them.
.NET
The .NET framework, developed by Microsoft, provides a large class library and language interoperability. This makes it an essential skill for a programmer working with a Microsoft stack.
Enum
An Enum or Enumerated type, is a data type that consists of a set of named values. As most programming languages implement the enum type as one of their primitives it's an important concept for all developers.
Class Library
Reusing a properly engineered and thoroughly tested class library is the best way to keep your code concise, performant and reliable.
CLR
The Common Language Runtime (CLR), the virtual machine component of Microsoft's .NET framework, manages the execution of .NET programs. Knowing how the runtime works is necessary for making a large application fast and stable, avoiding issues like memory leaks and occasional slowdowns.
LINQ
LINQ provides a compile functional interface for querying datasets. A good .NET developer should be able to take full advantage of this.
Bug Fixing
Everyone makes mistakes. A good programmer should be able to find and fix a bug in their or someone else's code.
Language
A programmer should use a language as a tool, always taking advantage of language-specific data types and built-in functions.
Algorithmic Thinking
When designing and/or analyzing an algorithm or data structure, it is important to consider the performance and structure of an implementation. Algorithmic thinking is one of the key traits of a good programmer, especially one working on complex or performance-critical code.
Extension Methods
Extension methods enable are method of extending existing types without extending the type, recompiling or modifying the original type. They are a useful feature of developers who want to write and maintain clean and concise code.
Arithmetic
Arithmetic is a fundamental branch of mathematics. An understanding of arithmetic concepts, and their application, is important for every candidate.
Random
Random number generators are used to generate random numbers and/or symbols. There are a wide variety of random number generators each with very specific use cases, as such it's important for all developers to know and understand when to use each type.
Linked List
A linked list is a linear collection of data elements where each element points to the next. It is a data structure consisting of a collection of nodes which together represent a sequence. It is usually used for advanced scenarios where we need fast access to the next element, or when we need to remove an element from anywhere in the collection.
Accessibility Levels
Access modifiers like public, protected, or private should be used to specify accessibility levels - who can access the object or some of its parts. They are one of the key points for writing maintainable object-oriented code.
Properties
A property is a member of a class that provides a flexible mechanism for classes to expose private fields. It is a topic that should be well known to any developer who works with an OOP language that supports it.
Destructors
A destructor is a special member function that is called when the lifetime of an object ends. Developers should use them to free (unmanaged) resources that the object may have acquired during its lifetime.
Memory Management
Memory management allows programs to request memory dynamically from the operating system, and free it for reuse when no longer needed. Many modern programming languages automate this process; however, it should still be an important consideration when implementing an application.
OOP
Object-oriented programming is a paradigm based on encapsulating logic and data into objects, which may then contain fields and procedures. Many of the most widely used programming languages are based on OOP, making it a very important concept in modern programming.
Refactoring
The process of restructuring existing computer code without changing its external behavior. It is essential for keeping code readable and maintainable.
Queue
A queue is a collection of items that are maintained in a sequence and can be modified by the addition of entities at one end of the sequence and removal from the other end of the sequence. It is the collection to be used when first-in-first-out (FIFO) collection is needed.
Dictionary
A dictionary (or associative array) is a data type composed of a collection of key-value pairs, where each possible key appears at most once in the collection. It is used when we need to access items by their keys.
Iteration
Iteration is the act of repeating a process, or cycling through a collection. Iteration is one of the fundamental flow control tools available to developers.
Lists
Lists are collections that act as dynamic arrays. Lists offer the flexibility of dynamically sized arrays, the simplicity of access of arrays, and are more performant than more ubiquitous collections in most scenarios.
Boxing and Unboxing
Knowing the process for converting a value to a reference type and vice-versa is often needed to make properly optimized code.
Recursion
A good programmer should be familiar with when to use recursive functions, since they can provide elegant solutions for complex problems.
Tree
A tree is a hierarchical structure defined recursively starting with the root node, where each node is a data structure consisting of a value, together with a list of references to other nodes (the "children"). A lot of problems can be solved efficiently with trees, which makes them important for developers.
Regex
A regular expression (regex) is a special text string for describing a search pattern. It is a common way for extracting data from text.
Strings
The string data structure is used to represent text. It is one of the most commonly used data structures. Therefore, every programmer should be skilled at string manipulation.
Data Structures
Choosing the right data structure to solve a problem can have huge implications on the performance of an application. Knowing when to use a specific data structure is one of the most important skills for a programmer.
Pass by Reference
The call by reference method of passing arguments to a function copies the reference of an argument into the formal parameter. Inside the function, the reference is used to access the actual argument used in the call. This means that changes made to the parameter affect the passed argument. This is one of two possible ways for passing an argument to a function so it should be known to any developer.
Inheritance
In object-oriented programming, inheritance is the mechanism of basing a class upon another class, retaining similar implementation. Inheritance allows programmers to reuse code and is a must know topic for every programmer who works with OOP languages.
Sorting
Every programmer should be familiar with data-sorting methods, as sorting is very common in data-analysis processes.
Graphs
Many real-life situations are best modeled by graphs. Therefore, an in-depth knowledge of graph data structures is important for a good programmer.
Test Case Design
Being able to create a set of test cases that ensure adequate test coverage is a key skill for creating a successful test. It is desirable for the test suite also to be optimal, i.e. to minimize test execution effort and time without affecting the test coverage.
Unit Testing
Unit testing is a type of software testing where individual units or components of a software are tested. Unit testing of software applications is done during the development (coding) of an application and should be well known practice to any developer.
Async-Await
The async function declaration defines an asynchronous function, which can await a response. Using the async-await pattern allows using asynchronous code while not losing readability or maintainability.
Multithreading
Multi-threading allows a process to make more efficient use of modern hardware by allowing code to execute asynchronously. It can drastically improve the performance of any app; however, it can be tricky to get right, making this an important topic for any programmer.
Dynamic Programming
Dynamic programming methods for code optimization can be very useful to a programmer who understands them.
Package Manager
A package manager is a collection of software tools that automates the process of installing, upgrading and removing computer programs and libraries.
Synchronization
When using multithreading, developers need to know how to make one thread wait for another to finish its task before continuing with its work.
HashSet
HashSet is container that stores unique elements in no particular order. This allows for fast checks to see if a value was already added.
TDD
Test-driven development (TDD) is a software development process that relies on the repetition of a very short development cycle: requirements are turned into very specific test cases, based on which the software is improved only in order to pass the new tests. TDD is an essential skill for modern programmers.
StringBuilder
Since a string is an immutable data structure, concatenating multiple strings can introduce significant performance penalties. Every experienced developer should know when to use StringBuilder instead of simply concatenating two strings to improve performances in such scenarios.
Arrays
An array is a container of a fixed number of objects of a similar type. It is a fundamental component of most programming languages.
Integer Division
Integer division is division in which the fractional part (remainder) is discarded. Knowing this is important for optimal implementation of some algorithms and for avoiding common bugs.
Field Modifiers
Field modifiers should be used to specify additional properties of fields like their mutability, are they defined on an instance or are they static, etc.
Null Coalescing Operator
The null coalescing operator takes two values and returns a non-null value. It is often used to simplify conditionals that check if a variable is null.
Null Conditional Operator
The null conditional operator is a binary operator that returns null if its first argument is null; otherwise it performs a dereferencing operation as specified by the second argument. It's often used to simplify executing code if a variable is null.
Abstract Class
An abstract class can include abstract methods and can be subclassed, but it cannot be instantiated. They are often used as building blocks of application.
Method Overriding
Method overriding, in object-oriented programming, is a language feature that allows a subclass to provide a specific implementation of a method that is already provided by one of its parent classes.
Complexity
A good programmer should be able to analyze and plan for the performance of an algorithm.
Stack
A stack is dynamic data container that follows the Last In First Out (LIFO) principle. Developers should use stack when the last item to be inserted into a container is the first one to be deleted from it.
Higher Order Function
A higher order function is a function that takes another function as an argument, or returns another function. Developers often use them for writing reusable code.
Interfaces
An interface is used to define an abstract type that defines behaviors as method signatures. Instances of different types can implement the same interface and provide a way for a developer to reuse the code.
Serialization
Familiarity with data serialization to and from formats such as XML and JSON is important as it is commonly used for interprocess communication
XML
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The design goals of XML emphasize simplicity, generality, and usability across the Internet. This is one of the most used formats for exchanging data over the web.
Tuples
A tuple is an immutable collection which is ordered and unchangeable. It is a common collection in many programming languages.
Stream
A stream is a sequence of data elements made available over time. It is particularly useful for tasks that may benefit from being asynchronous, including tasks such as I/O processing or reading from a file, and as such is important for developers to understand.
Dynamic Objects
Dynamic objects expose members such as properties and methods at run time, instead of at compile time. This enables you to create objects to work with structures that do not match a static type or format.
Eager Loading
Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. Eager loading doesn't need subsequent separate query execution to fetch related entities.
Entity Framework
Entity Framework is an object-relational mapper (O/RM) that enables .NET developers to work with a database using .NET objects. It eliminates the need for most of the data-access code that developers usually need to write. Knowledge of the Entity Framework is important for .NET developers working with databases.
Lazy Loading
Lazy loading is the process whereby an entity or collection of entities is automatically loaded from the database the first time it is referred to. Lazy loading means delaying the loading of related data, until it is specifically requested.
Recommended Job Roles
These are the job roles that we recommend for the C# and .NET online test.
.NET Developer
Back-End Developer
C# Developer
Web Developer
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