C# Certification

C# certification syllabus & coverage

This certification tests genuine comprehension of C# language fundamentals, idiomatic patterns, data structures, and production practices. Questions are sampled across all course modules:

• Getting Started: Install the .NET SDK, run your first C# program with dotnet run, pick an editor, and see how the compiler, IL and the CLR turn code into a running app.
• Fundamentals: Variables, var, the built-in value types, conversions, operators, overflow, string formatting and nullable types: the C# every later module builds on.
• Flow Control: if and else, the ternary operator, switch statements, switch expressions with pattern matching, and the four C# loops with break and continue.
• Strings & Arrays: Immutable strings and their methods, StringBuilder, verbatim and raw literals, ordinal comparison, then arrays, ranges, indices and Span<T>.
• Methods: Write and call C# methods: parameters, optional and named arguments, params, overloading, ref/out/in, recursion, tuples and local functions.
• Classes & Objects: Model data with C# classes: properties, constructors and primary constructors, static members, records, structs, equality and nullable reference types.
• Inheritance & Interfaces: Inheritance, virtual and override, abstract and sealed classes, interfaces, type patterns and polymorphism in C#, and when composition beats all of it.
• Exceptions: Handle failures in C# with try, catch and finally: the exception hierarchy, filters, rethrowing, custom exceptions, using and IDisposable, and stack traces.
• Collections & Generics: List, Dictionary, HashSet, Queue, Stack and SortedDictionary, then the generics behind them: generic classes and methods, where constraints, yield and IEnumerable.
• LINQ: Delegates and lambdas first, then LINQ: Where, Select, OrderBy, GroupBy, Join and Aggregate, deferred execution, and IQueryable versus IEnumerable.
• Async & Await: Task, async and await from the ground up: what really runs when, WhenAll and WhenAny, exceptions, cancellation, async streams and the pitfalls that hang apps.
• Errors & Debugging: Read C# compiler errors and .NET stack traces, fix the 15 errors every beginner hits, and debug with breakpoints, nullable warnings and logging.
• C# + Tools: Nine mini-labs on C# as it is used at work: the dotnet CLI, NuGet, ASP.NET Core minimal APIs, xUnit, EF Core with PostgreSQL, Redis, Blazor, Docker and GitHub Actions.
• Data Structures & Algorithms: Build stacks, queues, linked lists, trees, heaps and graphs by hand in C#, then use List, Dictionary, PriorityQueue and SortedSet like a pro.
• Problem Solving: A repeatable way to crack coding problems in C#: read it, break it down, test small cases, then apply one of eight patterns that cover most interviews.
• Interview Questions: 60 C# and .NET interview questions with model answers, from value types to async, EF Core and DI lifetimes, plus a coding round and take-home checklist.
• Job Ready: What a C# resume must show for backend, cloud, Unity and desktop roles, three portfolio projects that get callbacks, where the jobs are, and the exam.

Exam rules & grading

The exam features 25 multiple-choice questions with a time limit of 35 minutes. A passing score of 70% or higher issues a permanent certificate with a verifiable credential ID that can be attached directly to your resume and LinkedIn Profile.

Frequently asked questions