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What are some of the important namespaces in C#? Provide a brief description of each
.NET contains a lot of namespaces and many more, if you include the third-party libraries. However, there are a few that you will use over and over. Here are the twenty that will get you through 80% of the common, recurring programming problems.
System
Contains the most fundamental types. These include commonly used classes, structures, enums, events, interfaces, etc.
System.Text
Contains classes that represent ASCII and Unicode character encodings. Classes for converting blocks of characters to and from blocks of bytes.
System.Text.RegularExpressions
Provides regular expression functionality.
System.Linq
Provides classes and interfaces that support queries that use Language-Integrated Query (LINQ).
System.XML.Linq
Contains the classes for LINQ to XML. LINQ to XML is an in-memory XML programming interface that enables you to modify XML documents efficiently and easily.
System.XML
Provides support for processing XML.
System.XML.Serialization
Contains classes that are used to serialize objects into XML format documents or streams.
System.Text.Json
Provides high-performance, low-allocating, and standards-compliant capabilities to process JavaScript Object Notation (JSON), which includes serializing objects to JSON text and deserializing JSON text to objects, with UTF-8 support built-in.
System.Diagnostics
Provides classes that allow you to interact with system processes, event logs, and performance counters.
System.Threading
Provides classes and interfaces that enable multithreaded programming. In addition to classes for synchronizing thread activities and access to data (Mutex , Monitor , Interlocked , AutoResetEvent , and so on), this namespace includes a ThreadPool class that allows you to use a pool of system-supplied threads, and a Timer class that executes callback methods on thread pool threads.
System.Threading.Tasks
Provides types that simplify the work of writing concurrent and asynchronous code. The main types are Task which represents an asynchronous operation that can be waited on and cancelled, and TaskTask, which is a task that can return a value. The TaskFactory class provides static methods for creating and starting tasks, and the TaskScheduler class provides the default thread scheduling infrastructure.
System.IO
Contains types that allow reading and writing to files and data streams, and types that provide basic file and directory support.
System.Net
Provides a simple programming interface for many of the protocols used on networks today.
System.Net.Http
Provides a programming interface for modern HTTP applications.
System.Net.Mail
Contains classes used to send electronic mail to a Simple Mail Transfer Protocol (SMTP) server for delivery.
System.Net.Sockets
Provides a managed implementation of the Windows Sockets (Winsock) interface for developers who need to tightly control access to the network.
System.Reflection
Contains types that retrieve information about assemblies, modules, members, parameters, and other entities in managed code by examining their metadata.
System.Security
Provides the underlying structure of the common language runtime security system, including base classes for permissions.
System.Security.Cryptography
Provides cryptographic services, including secure encoding and decoding of data, as well as many other operations, such as hashing, random number generation, and message authentication.
System.Dynamic
Provides the support for dynamic programming.
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