System.Web Namespace

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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.

Classes

AspNetHostingPermission	Controls access permissions in ASP.NET hosted environments. This class cannot be inherited.
AspNetHostingPermissionAttribute	Allows security actions for AspNetHostingPermission to be applied to code using declarative security. This class cannot be inherited.
DefaultHttpHandler	Represents the properties and methods of a default HTTP handler.
EventHandlerTaskAsyncHelper	Converts 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.
HtmlString	Represents an HTML-encoded string that should not be encoded again.
HttpApplication	Defines 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.
HttpApplicationState	Enables sharing of global information across multiple sessions and requests within an ASP.NET application.
HttpApplicationStateBase	Serves as the base class for classes that enable information to be shared across multiple sessions and requests within an ASP.NET application.
HttpApplicationStateWrapper	Encapsulates the HTTP intrinsic object that enables information to be shared across multiple requests and sessions within an ASP.NET application.
HttpBrowserCapabilities	Enables the server to gather information on the capabilities of the browser that is running on the client.
HttpBrowserCapabilitiesBase	Serves as the base class for classes that enable the server to gather information about the capabilities of the browser that made the current request.
HttpBrowserCapabilitiesWrapper	Encapsulates the HTTP intrinsic object that enables the server to gather information about the capabilities of the browser that has made the current request.
HttpCachePolicy	Contains methods for setting cache-specific HTTP headers and for controlling the ASP.NET page output cache.
HttpCachePolicyBase	Serves as the base class for classes that contain methods for setting cache-specific HTTP headers and for controlling the ASP.NET page output cache.
HttpCachePolicyWrapper	Encapsulates the HTTP intrinsic object that contains methods for setting cache-specific HTTP headers and for controlling the ASP.NET page output cache.
HttpCacheVaryByContentEncodings	Provides a type-safe way to set the VaryByContentEncodings property of the HttpCachePolicy class.
HttpCacheVaryByHeaders	Provides a type-safe way to set the VaryByHeaders property.
HttpCacheVaryByParams	Provides a type-safe way to set the VaryByParams property.
HttpClientCertificate	Provides the client certificate fields issued by the client in response to the server's request for the client's identity.
HttpCompileException	The exception that is thrown when a compiler error occurs.
HttpContext	Encapsulates all HTTP-specific information about an individual HTTP request.
HttpContextBase	Serves as the base class for classes that contain HTTP-specific information about an individual HTTP request.
HttpContextWrapper	Encapsulates the HTTP intrinsic object that contains HTTP-specific information about an individual HTTP request.
HttpCookie	Provides a type-safe way to create and manipulate individual HTTP cookies.
HttpCookieCollection	Provides a type-safe way to manipulate HTTP cookies.
HttpException	Describes an exception that occurred during the processing of HTTP requests.
HttpFileCollection	Provides access to and organizes files uploaded by a client.
HttpFileCollectionBase	Serves as the base class for classes that provide access to files that were uploaded by a client.
HttpFileCollectionWrapper	Encapsulates the HTTP intrinsic object that provides access to files that were uploaded by a client.
HttpModuleCollection	Provides a way to index and retrieve a collection of IHttpModule objects.
HttpParseException	The exception that is thrown when a parse error occurs.
HttpPostedFile	Provides access to individual files that have been uploaded by a client.
HttpPostedFileBase	Serves as the base class for classes that provide access to individual files that have been uploaded by a client.
HttpPostedFileWrapper	Encapsulates the HTTP intrinsic object that provides access to individual files that have been uploaded by a client.
HttpRequest	Enables ASP.NET to read the HTTP values sent by a client during a Web request.
HttpRequestBase	Serves as the base class for classes that enable ASP.NET to read the HTTP values sent by a client during a Web request.
HttpRequestValidationException	The 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.
HttpRequestWrapper	Encapsulates the HTTP intrinsic object that enables ASP.NET to read the HTTP values that are sent by a client during a Web request.
HttpResponse	Encapsulates HTTP-response information from an ASP.NET operation.
HttpResponseBase	Represents the base class for classes that provides HTTP-response information from an ASP.NET operation.
HttpResponseWrapper	Encapsulates the HTTP intrinsic object that provides HTTP-response information from an ASP.NET operation.
HttpRuntime	Provides a set of ASP.NET run-time services for the current application.
HttpServerUtility	Provides helper methods for processing Web requests.
HttpServerUtilityBase	Serves as the base class for classes that provide helper methods for processing Web requests.
HttpServerUtilityWrapper	Encapsulates the HTTP intrinsic object that provides helper methods for processing Web requests.
HttpSessionStateBase	Serves as the base class for classes that provides access to session-state values, session-level settings, and lifetime management methods.
HttpSessionStateWrapper	Encapsulates the HTTP intrinsic object that provides access to session-state values, session-level settings, and lifetime management methods.
HttpStaticObjectsCollection	Provides a collection of application-scoped objects for the StaticObjects property.
HttpStaticObjectsCollectionBase	Serves as the base class for classes that provide a collection of application-scoped objects for the StaticObjects property.
HttpStaticObjectsCollectionWrapper	Encapsulates the HTTP intrinsic object that provides a collection of application-scoped objects for the StaticObjects property.
HttpTaskAsyncHandler	Provides methods that a derived task handler class can implement in order to process an asynchronous task.
HttpUnhandledException	The exception that is thrown when a generic exception occurs.
HttpUtility	Provides methods for encoding and decoding URLs when processing Web requests. This class cannot be inherited.
HttpWorkerRequest	This abstract class defines the base worker methods and enumerations used by ASP.NET managed code to process requests.
HttpWriter	Provides a TextWriter object that is accessed through the intrinsic HttpResponse object.
IisTraceListener	Provides a listener that routes all tracing and debugging output to the IIS 7.0 infrastructure.
MimeMapping	Maps document extensions to content MIME types.
ParserError	Represents a parser error or warning. This class cannot be inherited.
ParserErrorCollection	Manages a set of parser errors detected during parsing. This class cannot be inherited.
PreApplicationStartMethodAttribute	Provides expanded support for application startup.
ProcessInfo	Provides information on processes currently executing.
ProcessModelInfo	Contains methods that return information about worker processes.
SiteMap	The 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.
SiteMapNode	Represents a node in the hierarchical site map structure such as that described by the SiteMap class and classes that implement the abstract SiteMapProvider class.
SiteMapNodeCollection	Provides a strongly typed collection for SiteMapNode objects and implements the IHierarchicalEnumerable interface to support navigating through the collection.
SiteMapProvider	Provides 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.
SiteMapProviderCollection	Used 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.
SiteMapResolveEventArgs	Provides data for an event that is raised by calling the CurrentNode property of the SiteMapProvider class.
StaticSiteMapProvider	Serves 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.
TraceContext	Captures and presents execution details about a Web request. This class cannot be inherited.
TraceContextEventArgs	Provides a collection of trace records to any method that handles the TraceFinished event. This class cannot be inherited.
TraceContextRecord	Represents an ASP.NET trace message and any associated data.
UnvalidatedRequestValues	Provides access to HTTP request values without triggering ASP.NET request validation.
UnvalidatedRequestValuesBase	Serves as the base class for classes that provide access to HTTP request values without triggering ASP.NET request validation.
UnvalidatedRequestValuesWrapper	Provides a wrapper class for the UnvalidatedRequestValuesBase class, and provides access to HTTP request values without triggering ASP.NET request validation.
VirtualPathUtility	Provides utility methods for common virtual path operations.
WebPageTraceListener	Provides a listener that directs Trace messages to ASP.NET Web page outputs.
XmlSiteMapProvider	The 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.

Interfaces

IHtmlString	Represents an HTML-encoded string that should not be encoded again.
IHttpAsyncHandler	Defines the contract that HTTP asynchronous handler objects must implement.
IHttpHandler	Defines the contract that ASP.NET implements to synchronously process HTTP Web requests using custom HTTP handlers.
IHttpHandlerFactory	Defines the contract that class factories must implement to create new IHttpHandler objects.
IHttpModule	Provides module initialization and disposal events to the implementing class.
IPartitionResolver	Defines methods that must be implemented for custom session-state partition resolution.
ISubscriptionToken	Represents an interface that is implemented by an object and that can be used to unsubscribe listeners.
ITlsTokenBindingInfo	Provides information about transport layer security (TLS) token binding.

Enums

ApplicationShutdownReason	Specifies why the AppDomain class shut down.
AspNetHostingPermissionLevel	Specifies the trust level that is granted to an ASP.NET Web application.
HttpCacheability	Provides enumerated values that are used to set the `Cache-Control` HTTP header.
HttpCacheRevalidation	Provides enumerated values that are used to set revalidation-specific `Cache-Control` HTTP headers.
HttpCookieMode	Specifies how cookies are used for a Web application.
HttpValidationStatus	Provides enumerated values that indicate cache validation status.
ProcessShutdownReason	Provides enumerated values that indicate why a process has shut down.
ProcessStatus	Provides enumerated values that indicate the current status of a process.
ReadEntityBodyMode	Specifies constants that indicate how the entity body of an HTTP request has been read.
RequestNotification	Indicates when events and other life-cycle events occur while a HttpApplication request is being processed.
RequestNotificationStatus	Specifies the state of a notification in the request pipeline.
SameSiteMode	Specifies constants that indicate the value for the SameSite attribute of the cookie.
TraceMode	Specifies in what order trace messages are emitted into the HTML output of a page.

Delegates

BeginEventHandler	Represents the method that handles asynchronous events such as application events. This delegate is called at the start of an asynchronous operation.
EndEventHandler	Represents the method that handles asynchronous events such as application events.
HttpCacheValidateHandler	Represents a method that is called to validate a cached item before the item is served from the cache.
HttpResponseSubstitutionCallback	Represents the method that handles post-cache substitution.
HttpWorkerRequest.EndOfSendNotification	Represents the method that Notifies callers when sending of the response is complete.
SiteMapResolveEventHandler	Represents the method that will handle the SiteMapResolve event of a specific instance of the SiteMapProvider or static SiteMap class.
TaskEventHandler	Represents the asynchronous task that is being processed by an instance of the EventHandlerTaskAsyncHelper class.
TraceContextEventHandler	Represents the method that handles the TraceFinished event of a TraceContext object.

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System.Web Namespace

Classes

Interfaces

Enums

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