In Brief
The .NET Framework class library (FCL) provides an extensive set of prebuilt functionality in the form of a rich class library. Included with the class library are implementations of common programming constructs and tasks, including Collections, Input/Output, Networking, Distributed Objects, XML processing, and database connectivity.
System namespace, used by almost every application, provides a set of core classes for the .NET Framework, including the structures that define primitive CLR types.
System.Collections namespaces provide a rich set of collections for the .NET programming model.
System.IO contains a rich set of reader and writer classes for reading and writing text and binary information to their associated streams.
System.Reflection ...
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