Learn C# - 10 Code Examples & CST Typing Practice Test
C# (C-Sharp) is a modern, object-oriented, multi-paradigm programming language built by Microsoft for the .NET platform. It is designed for productivity, type safety, performance, and building scalable applications across desktop, web, mobile, gaming, and cloud systems.
Learn CSHARP with Real Code Examples
Updated Nov 17, 2025
Explain
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.
Core Features
CLR runtime and IL execution
Classes, structs, interfaces, records
Generics and type inference
LINQ for data querying
Async/await for concurrency
Basic Concepts Overview
Variables, data types
Classes, structs, interfaces
OOP principles
Delegates, events, lambdas
LINQ and collections
Async/await concurrency
Project Structure
Program.cs / Startup.cs
Controllers/Services folders (for APIs)
appsettings.json
csproj project file
bin/obj build directories
Building Workflow
Write .cs files
Build with dotnet build
Run via dotnet run
Manage dependencies via NuGet
Publish as DLL/EXE or container
Difficulty Use Cases
Beginner: Console apps
Intermediate: ASP.NET APIs
Advanced: Enterprise services
Expert: Game development or high-scale distributed systems
Comparisons
More structured than JavaScript
More enterprise-ready than PHP
Faster development cycle than Java
Higher-level than Go or Rust
Versioning Timeline
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
Glossary
CLR: Common Language Runtime
IL: Intermediate Language
NuGet: .NET package manager
EF Core: ORM framework
Frequently Asked Questions about C#
What is C#?
C# (C-Sharp) is a modern, object-oriented, multi-paradigm programming language built by Microsoft for the .NET platform. It is designed for productivity, type safety, performance, and building scalable applications across desktop, web, mobile, gaming, and cloud systems.
What are the primary use cases for C#?
Enterprise backend systems. Web APIs (ASP.NET Core). Unity game development. Desktop software (WPF/WinUI). Cloud-native microservices on Azure. Cross-platform mobile apps (MAUI/Xamarin)
What are the strengths of C#?
Excellent tooling and developer productivity. High performance with modern .NET. Strong type safety. Great for enterprise systems. Massive ecosystem (ASP.NET, Unity, MAUI)
What are the limitations of C#?
Heavily tied to Microsoft ecosystem historically. Slightly more complex runtime model. Not ideal for low-level systems. Unity uses older C# versions at times
How can I practice C# typing speed?
CodeSpeedTest offers 10+ real C# code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.