C#.

Setting Up C# Development Environment

Install the .NET SDK, configure VS Code with the C# extension, and run your first C# program.

Variables in C#

Understand var, explicit types, nullable reference types, const, and readonly in C#.

Data Types in C#

Understand value types vs reference types, structs, records, and boxing/unboxing in C#.

Operators in C#

Master arithmetic, null-coalescing, null-conditional, and pattern matching operators in C#.

Control Flow in C#

Master if/else, switch expressions, for/foreach/while loops, and pattern matching in C#.

Functions and Methods in C#

Learn methods, ref/out parameters, optional parameters, local functions, and expression-bodied members.

Strings in C#

String interpolation, verbatim strings, Span<char>, StringBuilder, and regex in C#.

Arrays in C#

Single and multi-dimensional arrays, array methods, LINQ, and Span<T> in C#.

Arrays and Collections in C#

Learn arrays, List<T>, Dictionary<K,V>, HashSet<T>, Queue, Stack, and IEnumerable in C#.

Object-Oriented Programming in C#

Classes, constructors, properties, encapsulation, inheritance, and polymorphism in C#.

Introduction to C#

Learn what C# is, how the .NET ecosystem works, and where C# is used in the real world.

Intermediate

For developers with core concepts down

11 lessons

Interfaces in C#

Interface definition, explicit implementation, default interface methods, and real-world usage in C#.

Generics in C#

Generic classes, methods, constraints, covariance, and contravariance in C#.

LINQ in C#

Query syntax, method syntax, deferred execution, GroupBy, Join, and projection with LINQ.

Async/Await in C#

Master async/await, Task, Task<T>, ConfigureAwait, CancellationToken, and ValueTask in C#.

Delegates, Events, and Lambdas in C#

Action, Func, Predicate, lambda expressions, multicast delegates, and events in C#.

Error Handling in C#

try/catch/finally, custom exceptions, AggregateException, and global error handlers in C#.

File I/O in C#

File class, StreamReader/Writer, JSON with System.Text.Json, and async file I/O in C#.

Pattern Matching in C#

is expressions, switch expressions, property patterns, positional patterns, and list patterns in C#.

Testing in C#

Unit testing with xUnit, NUnit, FluentAssertions, Moq, and test organization in C#.

ASP.NET Core Basics

Minimal APIs, controllers, middleware, dependency injection, and appsettings in ASP.NET Core.

Entity Framework Core

DbContext, migrations, LINQ queries, relationships, and async EF Core in C#.

Advanced

Production-grade patterns for experienced engineers

3 lessons

csharp advanced

Design Patterns in C#

Typed Singleton, Repository, Mediator, and Decorator patterns implemented in C#.

csharp advanced

Performance in C#

Span<T>, Memory<T>, ArrayPool, BenchmarkDotNet, and value types for high-performance C#.

csharp advanced

C# Interview Preparation

Top 35 C# interview questions and answers covering language features, OOP, async, and .NET internals.