Value Types vs Reference Types, Struct vs Class, and Boxing & Unboxing — The Complete C# Guide

Value Types vs Reference Types, Struct vs Class, and Boxing & Unboxing These three topics are deeply connected. You cannot fully understand struct vs class without understanding the stack and heap. You cannot fully understand boxing and unboxing without understanding value and reference types. This guide covers all three together — the way they should be taught. How .NET Manages Memory Before anything else, you need to understand two memory regions. The Stack Fast allocation and deallocation LIFO (Last In, First Out) structure Stores value types and method call frames Memory is automatically reclaimed when the method exits Limited in size The Heap Slower allocation Stores reference types (objects) Managed by the Garbage Collector (GC) Much larger than the stack Memory is reclaimed by the GC, not deterministically This distinction is the foundation of everything that follows. Value Types A value type holds its data directly in memory. When you assign a value type to another variable