What is .NET Framework class library?

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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