What are the main uses of sealed classes and partial classes, and why are they necessary?

Question

Accepted Answer

Sealed classes and partial classes are used in C# for different purposes such as restricting inheritance and organizing code.

Sealed classes are used to restrict inheritance, meaning they cannot be inherited by other classes. This is useful when you want to prevent further derivation of a class.
Partial classes are used to split the definition of a class into multiple files. This is helpful for organizing large classes or separating auto-generated code from custom code.
Sealed classes are necessary to ensure certain classes cannot be extended, providing more control over the design and preventing unintended modifications.
Partial classes are necessary for better code organization and maintainability, especially in large projects where multiple developers are working on different parts of a class.

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