Lesson 1 of 38 in the free C# Language — Basics to Advanced course on DevLadder.

C# is the language ; .NET is the platform (runtime + base class library + SDK). You write C#, the compiler produces IL, and the .NET runtime executes it.

CLR (Common Language Runtime): JIT, GC, type safety, exception handling, threading.

BCL (Base Class Library): System , System.Collections.Generic , System.IO , System.Net.Http , ...

CTS / CLS : the common type system that lets C#, F# and VB.NET interoperate.

// Program.cs — a complete program using top-level statements (C# 9+) Console . WriteLine ( "Hello, Divakar!" ); var name = args . Length > 0 ? args [ 0 ] : "world" ; Console . WriteLine ( $"Hello, { name } " );

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dotnet new console -n HelloApp cd HelloApp dotnet run -- Divakar

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Interview tip: "Managed code" = code whose execution is managed by the CLR (memory, security, exceptions).…