The .NET Framework class library is a library consisting of namespaces, classes, interfaces, and datatypes included in the .NET Framework. This library is organized into namespaces that contain functionally related groups of classes. These namespaces are divided among different categories, such as data access, common types, debugging, file access, network communication, security, Windows applications, Web applications, Web services, XML data etc. Following are some important namespaces that are defined in the .NET Framework class library:
| Namespaces | Description |
| System | This namespace includes all common datatypes, string values, arrays, methods for data conversion, and methods related to mathematical operations. |
| System.Data, System.Data.Common, System.Data.OleDb, System.Data.SqlClient, System.Data.SqlTypes | These namespaces are used to access a database, perform commands on a database, and retrieve and manipulate a database. |
| System.IO, System.DirectoryServices, System.IO.IsolatedStorage | These namespaces are used to access, read, and write files, and retrieve file paths. |
| System.Diagnostics | This namespace is used to debug and trace the execution of an application. |
| System.Net, System.Net.Sockets | These namespaces are used to communicate over the Internet when creating peer-to-peer applications. |
| System.Windows.Forms, System.Windows.Forms.Design | These namespaces are used to create Windows-based applications using Windows user interface components. |
| System.Web, System.WebCaching, System.Web.UI, System.Web.UI.Design, System.Web.UI.WebControls, System.Web.UI.HtmlControls, System.Web.Configuration, System.Web.Hosting, System.Web.Mail, System.Web.SessionState | These namespaces are used to create ASP.NET Web applications that execute over the Internet. |
| System.Web.Services, System.Web.Services.Description, System.Web.Services.Configuration, System.Web.Services.Discovery, System.Web.Services.Protocols | These namespaces are used to create XML Web services and components that can be published over the Internet. |
| System.Security, System.Security.Permissions, System.Security.Policy, System.WebSecurity, System.Security.Cryptography | These namespaces are used for authentication, authorization, and encryption. |
| System.Xml, System.Xml.Schema, System.Xml.Serialization, System.Xml.XPath, System.Xml.Xsl | These namespaces are used to create and access XML files. |
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