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System.Net Namespace

The System.Net namespace provides a simple programming interface for many of the protocols used on networks today. The WebRequest and WebResponse classes form the basis of what are called pluggable protocols, an implementation of network services that enables you to develop applications that use Internet resources without worrying about the specific details of the individual protocols.
 ClassDescription
Public classAuthenticationManagerManages the authentication modules called during the client authentication process.
Public classAuthorizationContains an authentication message for an Internet server.
Public classCookieProvides a set of properties and methods that are used to manage cookies. This class cannot be inherited.
Public classCookieCollectionProvides a collection container for instances of the Cookie class.
Public classCookieContainerProvides a container for a collection of CookieCollection objects.
Public classCookieExceptionThe exception that is thrown when an error is made adding a Cookie to a CookieContainer.
Public classCredentialCacheProvides storage for multiple credentials.
Public classDnsProvides simple domain name resolution functionality.
Public classDnsPermissionControls rights to access Domain Name System (DNS) servers on the network.
Public classDnsPermissionAttributeSpecifies permission to request information from Domain Name Servers.
Public classDownloadDataCompletedEventArgsProvides data for the DownloadDataCompleted event.
Public classDownloadProgressChangedEventArgsProvides data for the DownloadProgressChanged event of a WebClient.
Public classDownloadStringCompletedEventArgsProvides data for the DownloadStringCompleted event.
Public classEndPointIdentifies a network address. This is an abstract class.
Public classEndpointPermissionDefines an endpoint that is authorized by a SocketPermission instance.
Public classFileWebRequestProvides a file system implementation of the WebRequest class.
Public classFileWebResponseProvides a file system implementation of the WebResponse class.
Public classFtpWebRequestImplements a File Transfer Protocol (FTP) client.
Public classFtpWebResponseEncapsulates a File Transfer Protocol (FTP) server's response to a request.
Public classGlobalProxySelectionContains a global default proxy instance for all HTTP requests.
Public classHttpListenerProvides a simple, programmatically controlled HTTP protocol listener. This class cannot be inherited.
Public classHttpListenerBasicIdentityHolds the user name and password from a basic authentication request.
Public classHttpListenerContextProvides access to the request and response objects used by the HttpListener class. This class cannot be inherited.
Public classHttpListenerExceptionThe exception that is thrown when an error occurs processing an HTTP request.
Public classHttpListenerPrefixCollectionRepresents the collection used to store Uniform Resource Identifier (URI) prefixes for HttpListener objects.
Public classHttpListenerRequestDescribes an incoming HTTP request to an HttpListener object. This class cannot be inherited.
Public classHttpListenerResponseRepresents a response to a request being handled by an HttpListener object.
Public classHttpVersionDefines the HTTP version numbers that are supported by the HttpWebRequest and HttpWebResponse classes.
Public classHttpWebRequestProvides an HTTP-specific implementation of the WebRequest class.
Public classHttpWebResponseProvides an HTTP-specific implementation of the WebResponse class.
Public classIPAddressProvides an Internet Protocol (IP) address.
Public classIPEndPointRepresents a network endpoint as an IP address and a port number.
Public classIPHostEntryProvides a container class for Internet host address information.
Public classIrDAEndPointRepresents an end point for an infrared connection.
Public classNetworkCredentialProvides credentials for password-based authentication schemes such as basic, digest, NTLM, and Kerberos authentication.
Public classOpenReadCompletedEventArgsProvides data for the OpenReadCompleted event.
Public classOpenWriteCompletedEventArgsProvides data for the OpenWriteCompleted event.
Public classProtocolViolationExceptionThe exception that is thrown when an error is made while using a network protocol.
Public classServicePointProvides connection management for HTTP connections.
Public classServicePointManagerManages the collection of ServicePoint objects.
Public classSocketAddressStores serialized information from EndPoint derived classes.
Public classSocketPermissionControls rights to make or accept connections on a transport address.
Public classSocketPermissionAttributeSpecifies security actions to control Socket connections. This class cannot be inherited.
Public classUploadDataCompletedEventArgsProvides data for the UploadDataCompleted event.
Public classUploadFileCompletedEventArgsProvides data for the UploadFileCompleted event.
Public classUploadProgressChangedEventArgsProvides data for the UploadProgressChanged event of a WebClient.
Public classUploadStringCompletedEventArgsProvides data for the UploadStringCompleted event.
Public classUploadValuesCompletedEventArgsProvides data for the UploadValuesCompleted event.
Public classWebClientProvides common methods for sending data to and receiving data from a resource identified by a URI.
Public classWebExceptionThe exception that is thrown when an error occurs while accessing the network through a pluggable protocol.
Public classWebHeaderCollectionContains protocol headers associated with a request or response.
Public classWebPermissionControls rights to access HTTP Internet resources.
Public classWebPermissionAttributeSpecifies permission to access Internet resources. This class cannot be inherited.
Public classWebProxyContains HTTP proxy settings for the WebRequest class.
Public classWebRequestMakes a request to a Uniform Resource Identifier (URI). This is an abstract class.
Public classWebRequestMethodsContainer class for WebRequestMethods.Ftp, WebRequestMethods.File, and WebRequestMethods.Http classes. This class cannot be inherited
Public classWebRequestMethods.FileRepresents the types of file protocol methods that can be used with a FILE request. This class cannot be inherited.
Public classWebRequestMethods.FtpRepresents the types of FTP protocol methods that can be used with an FTP request. This class cannot be inherited.
Public classWebRequestMethods.HttpRepresents the types of HTTP protocol methods that can be used with an HTTP request.
Public classWebResponseProvides a response from a Uniform Resource Identifier (URI). This is an abstract class.
 InterfaceDescription
Public interfaceIAuthenticationModuleProvides the base authentication interface for Web client authentication modules.
Public interfaceICertificatePolicyValidates a server certificate.
Public interfaceICredentialPolicyDefines the credential policy to be used for resource requests that are made using WebRequest and its derived classes.
Public interfaceICredentialsProvides the base authentication interface for retrieving credentials for Web client authentication.
Public interfaceICredentialsByHostProvides the interface for retrieving credentials for a host, port, and authentication type.
Public interfaceIWebProxyProvides the base interface for implementation of proxy access for the WebRequest class.
Public interfaceIWebProxyScriptProvides the base interface to load and execute scripts for automatic proxy detection.
Public interfaceIWebRequestCreateProvides the base interface for creating WebRequest instances.
 DelegateDescription
Public delegateAuthenticationSchemeSelectorSelects the authentication scheme for an HttpListener instance.
Public delegateBindIPEndPointRepresents the method that specifies a local Internet Protocol address and port number for a ServicePoint.
Public delegateDownloadDataCompletedEventHandlerRepresents the method that will handle the DownloadDataCompleted event of a WebClient.
Public delegateDownloadProgressChangedEventHandlerRepresents the method that will handle the WebClient.DownloadProgressChanged event of a WebClient.
Public delegateDownloadStringCompletedEventHandlerRepresents the method that will handle the DownloadStringCompleted event of a WebClient.
Public delegateHttpContinueDelegateRepresents the method that notifies callers when a continue response is received by the client.
Public delegateOpenReadCompletedEventHandlerRepresents the method that will handle the OpenReadCompleted event of a WebClient.
Public delegateOpenWriteCompletedEventHandlerRepresents the method that will handle the OpenWriteCompleted event of a WebClient.
Public delegateUploadDataCompletedEventHandlerRepresents the method that will handle the UploadDataCompleted event of a WebClient.
Public delegateUploadFileCompletedEventHandlerRepresents the method that will handle the UploadFileCompleted event of a WebClient.
Public delegateUploadProgressChangedEventHandlerRepresents the method that will handle the UploadProgressChanged event of a WebClient.
Public delegateUploadStringCompletedEventHandlerRepresents the method that will handle the UploadStringCompleted event of a WebClient.
Public delegateUploadValuesCompletedEventHandlerRepresents the method that will handle the UploadValuesCompleted event of a WebClient.
 EnumerationDescription
Public enumerationAuthenticationSchemesSpecifies protocols for authentication.
Public enumerationDecompressionMethodsRepresents the file compression and decompression encoding format to be used to compress the data received in response to an HttpWebRequest.
Public enumerationFtpStatusCodeSpecifies the status codes returned for a File Transfer Protocol (FTP) operation.
Public enumerationHttpRequestHeaderThe HTTP headers that may be specified in a client request.
Public enumerationHttpResponseHeaderThe HTTP headers that can be specified in a server response.
Public enumerationHttpStatusCodeContains the values of status codes defined for HTTP.
Public enumerationNetworkAccessSpecifies network access permissions.
Public enumerationSecurityProtocolTypeSpecifies the security protocols that are supported by the Schannel security package.
Public enumerationTransportTypeDefines transport types for the SocketPermission and Socket classes.
Public enumerationWebExceptionStatusDefines status codes for the WebException class.
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