Namespace A namespace is a container that holds classes, interfaces, structs, enums, and other namespaces. It helps organize code and avoid naming conflicts between classes with the same name. Purpose: To logically group related classes and types To avoid name clashes in large applications or when using external libraries To improve code readability and maintainability Common Use Cases: Organizing code into layers like Models, Services, Controllers, Helpers Separating business logic from data access Grouping related utility or extension methods Key Points: Defined using the namespace keyword Can contain multiple classes, enums, or even nested namespaces Can be referenced in other files using the using directive One file can belong to only one namespace, but a namespace can span multiple files Types of Namespace: System Namespaces  – Provided by .NET (e.g., System, System.Collections.Generic) User-defined  - Creat...