Technology & IT Skills

C# Quiz: Test Your Programming Skills

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This C# quiz helps you check core syntax, OOP basics, and problem solving so you can find weak spots fast. You will get clear answers and brief explanations as you go. Want more practice? Try the C# practice test, polish your web stack with the asp.net quiz, or review fundamentals with the c programming quiz.

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1Which keyword is used to define a constant field in C#?
2What is the default value of a bool type field in C#?
3Which of these is a reference type in C#?
4Which loop construct guarantees that the loop body executes at least once?
5How do you declare a namespace in C#?
6What operator provides a default value if the operand is null?
7How do you denote a single-line comment in C#?
8What is the correct signature for the entry point of a C# console application?
9What is the output of the following code? int x = 5; Console.WriteLine(x++);
10Which exception is specifically thrown when an integer division by zero occurs?
11What does LINQ stand for?
12Which generic collection automatically grows and maintains the order of insertion?
13Which delegate declaration correctly defines a method signature that returns void and takes an int parameter?
14How do you subscribe to an event named 'Changed' using a handler 'OnChanged'?
15What is method overloading in C#?
16Which symbol is used in C# to inherit from a base class or implement an interface?
17What is the purpose of the async keyword when applied to a method?
18Which class in .NET is used to create and manage threads?
19In multithreading, what is the purpose of the lock statement?
20How do you start a Task that executes a method 'DoWork'?
21Which namespace contains reflection types such as Type and PropertyInfo?
22What does the unsafe keyword allow in C#?
23Which cast would unbox an object 'obj' to an int?
24What is boxing in C#?
25What is an expression tree in C# primarily used for?
Learning Goals

Study Outcomes

  1. Understand C# Fundamentals -

    Master core syntax, data types, and control structures to build a solid foundation for your C# programming test.

  2. Apply Object-Oriented Programming Concepts -

    Utilize classes, inheritance, and interfaces to solve real-world coding scenarios in this C# online test.

  3. Implement Advanced C# Features -

    Explore LINQ, async/await, and delegates to enhance your solutions and demonstrate proficiency in the C# quiz.

  4. Analyze and Debug Code Efficiently -

    Identify common errors and optimize performance by working through practical debugging challenges in the c sharp quiz.

  5. Evaluate Your C# Skill Level -

    Leverage instant feedback from the C# assessment test to pinpoint strengths and areas for improvement.

  6. Track Progress and Boost Confidence -

    Monitor your scores over time and refine your coding techniques to advance from beginner to expert in C# programming.

Study Guide

Cheat Sheet

  1. CLR Data Types: Value vs Reference -

    The Common Language Runtime (CLR) categorizes data into value types and reference types (Microsoft Docs). Value types like int and struct store data directly, while reference types like string and class store a pointer to heap memory. Remember: "Value lives where it is defined, Reference points afar" as a mnemonic.

  2. Control Flow & Exception Handling -

    Master if/else, switch, loops and the try/catch/finally pattern as outlined in the official C# specification. Use the switch expression in C# 8+ for concise matching, for example: result = day switch { Day.Monday => "Start", _ => "Other" };. As recommended by Microsoft Docs, always catch specific exceptions before general ones to maintain clarity.

  3. OOP Foundations: Classes, Interfaces & Polymorphism -

    Understand classes, structs, inheritance, interfaces and polymorphism according to the .NET documentation. Remember the PIE mnemonic - Polymorphism, Inheritance, Encapsulation - to organize key concepts. For example, override a virtual method in a derived class using public override void Method() to implement runtime polymorphism.

  4. LINQ & Lambda Expressions -

    Leverage Language-Integrated Query (LINQ) to query collections declaratively, as shown in MSDN guides. Example: var evens = numbers.Where(n => n % 2 == 0).ToList(); uses a lambda for filtering. Practice both query syntax and method syntax to maximize readability and performance.

  5. Async/Await & Task-based Programming -

    Write non-blocking code using the async and await keywords per .NET official docs. For instance, async Task<int> FetchDataAsync() returns a Task that you await with var data = await FetchDataAsync();. Familiarize yourself with ConfigureAwait(false) to avoid deadlocks in UI or server applications.

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Michael HodgeEdTech Product Lead & Assessment Design SpecialistQuiz Maker
Updated Feb 22, 2026