Learn CSHARP with Real Code Examples

C# compiles to IL (Intermediate Language) and runs on the .NET CLR.

Supports OOP, functional programming, asynchronous programming, and modern language abstractions.

Used for enterprise apps, web APIs, Unity game development, cloud-native apps, and Windows desktop systems.

CLR runtime and IL execution

Classes, structs, interfaces, records

Generics and type inference

LINQ for data querying

Async/await for concurrency

Variables, data types

Classes, structs, interfaces

OOP principles

Delegates, events, lambdas

LINQ and collections

Async/await concurrency

Program.cs / Startup.cs

Controllers/Services folders (for APIs)

appsettings.json

csproj project file

bin/obj build directories

Write .cs files

Build with dotnet build

Run via dotnet run

Manage dependencies via NuGet

Publish as DLL/EXE or container

Beginner: Console apps

Intermediate: ASP.NET APIs

Advanced: Enterprise services

Expert: Game development or high-scale distributed systems

More structured than JavaScript

More enterprise-ready than PHP

Faster development cycle than Java

Higher-level than Go or Rust

C# 3.0 – LINQ

C# 5.0 – async/await

C# 7–9 – pattern matching, records

C# 10/11 – global usings, file-scoped namespaces

C# 12 – primary constructors

CLR: Common Language Runtime

IL: Intermediate Language

NuGet: .NET package manager

EF Core: ORM framework