For .NET Core and .NET 5+, this namespace contains the HttpUtility class.
For .NET Framework, this namespace contains classes and interfaces that enable browser-server communication. These classes include the HttpRequest class, which provides extensive information about the current HTTP request; the HttpResponse class, which manages HTTP output to the client; and the HttpServerUtility class, which provides access to server-side utilities and processes. System.Web also includes classes for cookie manipulation, file transfer, exception information, and output cache control in .NET Framework.
AspNetHostingPermissionControls access permissions in ASP.NET hosted environments. This class cannot be inherited.
AspNetHostingPermissionAttributeAllows security actions for AspNetHostingPermission to be applied to code using declarative security. This class cannot be inherited.
DefaultHttpHandlerRepresents the properties and methods of a default HTTP handler.
EventHandlerTaskAsyncHelperConverts task-returning asynchronous methods into methods that use the asynchronous programming model used in previous versions of ASP.NET and that is based on begin and end events.
HtmlStringRepresents an HTML-encoded string that should not be encoded again.
HttpApplicationDefines the methods, properties, and events that are common to all application objects in an ASP.NET application. This class is the base class for applications that are defined by the user in the Global.asax file.
HttpApplicationStateEnables sharing of global information across multiple sessions and requests within an ASP.NET application.
HttpApplicationStateBaseServes as the base class for classes that enable information to be shared across multiple sessions and requests within an ASP.NET application.
HttpApplicationStateWrapperEncapsulates the HTTP intrinsic object that enables information to be shared across multiple requests and sessions within an ASP.NET application.
HttpBrowserCapabilitiesEnables the server to gather information on the capabilities of the browser that is running on the client.
HttpBrowserCapabilitiesBaseServes as the base class for classes that enable the server to gather information about the capabilities of the browser that made the current request.
HttpBrowserCapabilitiesWrapperEncapsulates the HTTP intrinsic object that enables the server to gather information about the capabilities of the browser that has made the current request.
HttpCachePolicyContains methods for setting cache-specific HTTP headers and for controlling the ASP.NET page output cache.
HttpCachePolicyBaseServes as the base class for classes that contain methods for setting cache-specific HTTP headers and for controlling the ASP.NET page output cache.
HttpCachePolicyWrapperEncapsulates the HTTP intrinsic object that contains methods for setting cache-specific HTTP headers and for controlling the ASP.NET page output cache.
HttpCacheVaryByContentEncodingsProvides a type-safe way to set the VaryByContentEncodings property of the HttpCachePolicy class.
HttpCacheVaryByHeadersProvides a type-safe way to set the VaryByHeaders property.
HttpCacheVaryByParamsProvides a type-safe way to set the VaryByParams property.
HttpClientCertificateProvides the client certificate fields issued by the client in response to the server's request for the client's identity.
HttpCompileExceptionThe exception that is thrown when a compiler error occurs.
HttpContextEncapsulates all HTTP-specific information about an individual HTTP request.
HttpContextBaseServes as the base class for classes that contain HTTP-specific information about an individual HTTP request.
HttpContextWrapperEncapsulates the HTTP intrinsic object that contains HTTP-specific information about an individual HTTP request.
HttpCookieProvides a type-safe way to create and manipulate individual HTTP cookies.
HttpCookieCollectionProvides a type-safe way to manipulate HTTP cookies.
HttpExceptionDescribes an exception that occurred during the processing of HTTP requests.
HttpFileCollectionProvides access to and organizes files uploaded by a client.
HttpFileCollectionBaseServes as the base class for classes that provide access to files that were uploaded by a client.
HttpFileCollectionWrapperEncapsulates the HTTP intrinsic object that provides access to files that were uploaded by a client.
HttpModuleCollectionProvides a way to index and retrieve a collection of IHttpModule objects.
HttpParseExceptionThe exception that is thrown when a parse error occurs.
HttpPostedFileProvides access to individual files that have been uploaded by a client.
HttpPostedFileBaseServes as the base class for classes that provide access to individual files that have been uploaded by a client.
HttpPostedFileWrapperEncapsulates the HTTP intrinsic object that provides access to individual files that have been uploaded by a client.
HttpRequestEnables ASP.NET to read the HTTP values sent by a client during a Web request.
HttpRequestBaseServes as the base class for classes that enable ASP.NET to read the HTTP values sent by a client during a Web request.
HttpRequestValidationExceptionThe exception that is thrown when a potentially malicious input string is received from the client as part of the request data. This class cannot be inherited.
HttpRequestWrapperEncapsulates the HTTP intrinsic object that enables ASP.NET to read the HTTP values that are sent by a client during a Web request.
HttpResponseEncapsulates HTTP-response information from an ASP.NET operation.
HttpResponseBaseRepresents the base class for classes that provides HTTP-response information from an ASP.NET operation.
HttpResponseWrapperEncapsulates the HTTP intrinsic object that provides HTTP-response information from an ASP.NET operation.
HttpRuntimeProvides a set of ASP.NET run-time services for the current application.
HttpServerUtilityProvides helper methods for processing Web requests.
HttpServerUtilityBaseServes as the base class for classes that provide helper methods for processing Web requests.
HttpServerUtilityWrapperEncapsulates the HTTP intrinsic object that provides helper methods for processing Web requests.
HttpSessionStateBaseServes as the base class for classes that provides access to session-state values, session-level settings, and lifetime management methods.
HttpSessionStateWrapperEncapsulates the HTTP intrinsic object that provides access to session-state values, session-level settings, and lifetime management methods.
HttpStaticObjectsCollectionProvides a collection of application-scoped objects for the StaticObjects property.
HttpStaticObjectsCollectionBaseServes as the base class for classes that provide a collection of application-scoped objects for the StaticObjects property.
HttpStaticObjectsCollectionWrapperEncapsulates the HTTP intrinsic object that provides a collection of application-scoped objects for the StaticObjects property.
HttpTaskAsyncHandlerProvides methods that a derived task handler class can implement in order to process an asynchronous task.
HttpUnhandledExceptionThe exception that is thrown when a generic exception occurs.
HttpUtilityProvides methods for encoding and decoding URLs when processing Web requests. This class cannot be inherited.
HttpWorkerRequestThis abstract class defines the base worker methods and enumerations used by ASP.NET managed code to process requests.
HttpWriterProvides a TextWriter object that is accessed through the intrinsic HttpResponse object.
IisTraceListenerProvides a listener that routes all tracing and debugging output to the IIS 7.0 infrastructure.
MimeMappingMaps document extensions to content MIME types.
ParserErrorRepresents a parser error or warning. This class cannot be inherited.
ParserErrorCollectionManages a set of parser errors detected during parsing. This class cannot be inherited.
PreApplicationStartMethodAttributeProvides expanded support for application startup.
ProcessInfoProvides information on processes currently executing.
ProcessModelInfoContains methods that return information about worker processes.
SiteMapThe SiteMap class is an in-memory representation of the navigation structure for a site, which is provided by one or more site map providers. This class cannot be inherited.
SiteMapNodeRepresents a node in the hierarchical site map structure such as that described by the SiteMap class and classes that implement the abstract SiteMapProvider class.
SiteMapNodeCollectionProvides a strongly typed collection for SiteMapNode objects and implements the IHierarchicalEnumerable interface to support navigating through the collection.
SiteMapProviderProvides a common base class for all site map data providers, and a way for developers to implement custom site map data providers that can be used with the ASP.NET site map infrastructure as persistent stores for SiteMap objects.
SiteMapProviderCollectionUsed by the SiteMap class to track the set of SiteMapProvider objects that are available to the SiteMap during site map initialization. This class cannot be inherited.
SiteMapResolveEventArgsProvides data for an event that is raised by calling the CurrentNode property of the SiteMapProvider class.
StaticSiteMapProviderServes as a partial implementation of the abstract SiteMapProvider class and serves as a base class for the XmlSiteMapProvider class, which is the default site map provider in ASP.NET.
TraceContextCaptures and presents execution details about a Web request. This class cannot be inherited.
TraceContextEventArgsProvides a collection of trace records to any method that handles the TraceFinished event. This class cannot be inherited.
TraceContextRecordRepresents an ASP.NET trace message and any associated data.
UnvalidatedRequestValuesProvides access to HTTP request values without triggering ASP.NET request validation.
UnvalidatedRequestValuesBaseServes as the base class for classes that provide access to HTTP request values without triggering ASP.NET request validation.
UnvalidatedRequestValuesWrapperProvides a wrapper class for the UnvalidatedRequestValuesBase class, and provides access to HTTP request values without triggering ASP.NET request validation.
VirtualPathUtilityProvides utility methods for common virtual path operations.
WebPageTraceListenerProvides a listener that directs Trace messages to ASP.NET Web page outputs.
XmlSiteMapProviderThe XmlSiteMapProvider class is derived from the SiteMapProvider class and is the default site map provider for ASP.NET. The XmlSiteMapProvider class generates site map trees from XML files with the file name extension .sitemap.
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