Learn C# - 78 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.
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Learn CSHARP with Real Code Examples
Updated Nov 17, 2025
Performance Notes
Use Span<T> for memory efficiency
Pool objects using ArrayPool
Use async/await for scalable I/O
Enable RyuJIT optimizations
Security Notes
Use ASP.NET Core Identity
Validate all user input
Implement JWT/OAuth
Use HTTPS and strong API validation
Monitoring Analytics
Application Insights
Prometheus/Grafana
Serilog logging
OpenTelemetry tracing
Code Quality
Use Roslyn analyzers
Clean Architecture guidelines
Use SonarQube
Write xUnit tests
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 78+ real C# code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.