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System.Web Namespace

The System.Web namespace supplies classes and interfaces that enable browser-server communication. This namespace includes 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.

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

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

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

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