What Are Namespaces?
Namespaces are groups of classes, structures, interfaces, enumerations, and delegates, organized in a logical hierarchy by function, that enable you to access the core functionality you need in your applications.
Note
The System namespace contains all the base types you learned about yesterday, such as Int16, Int32, Decimal, and Short.
Each namespace in the FCL can contain multiple namespaces, or they can contain classes that expose properties and methods that you call in your applications. The namespaces within the FCL are grouped by the functionality they provide, which makes it very easy to find what you're looking for. It can be compared to a phone book, in which you look under B for bugs, and are led to exterminators, ...
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