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Day 01Sprint 1 • C# 12 & .NET CLI
2 Hours
Day 1: .NET 9 SDK, VS Code C# Dev Kit & First CLI App
.NET 9 is Microsoft's flagship high-performance, cross-platform runtime for modern cloud, web, and desktop systems. With C# 12 top-level statements, unnecessary boilerplate is eliminated, allowing developer code to execute directly with minimal syntax.
Install .NET 9 SDK and verify dotnet --info in terminal
Configure Visual Studio Code with the official C# Dev Kit extension
Create a modern C# 12 console application using dotnet new console
Understand Top-Level Statements and build your first CLI greetings engine
Core Architectural Insights
- .NET 9 SDK includes compiler, runtime, CLI tools, and Base Class Libraries (BCL)
- Top-level statements eliminate the classic class Program { static void Main() } ceremony
- dotnet run compiles in-memory and launches the application instantly
- dotnet build creates binary outputs in bin/Debug/net9.0/
Real-World Developer Analogy
Think of .NET 9 runtime as an ultra-fast Formula-1 engine. C# is the steering wheel, and the dotnet CLI is your command dashboard to start, test, and tune the vehicle.