System.Web.UI Namespace

The System.Web.UI namespace provides classes and interfaces that enable you to create ASP.NET server controls and ASP.NET Web pages for the user interface of your ASP.NET Web applications.

Classes

AsyncPostBackErrorEventArgs

Provides data for the AsyncPostBackError event.

AsyncPostBackTrigger

Defines a control and optional event of the control as an asynchronous postback control trigger that causes an UpdatePanel control to refresh.

AttributeCollection

Provides object-model access to all attributes declared in the opening tag of an ASP.NET server control element. This class cannot be inherited.

AuthenticationServiceManager

Configures the location of a custom implementation of the authentication service.

BaseParser

Provides a base set of functionality for classes involved in parsing ASP.NET page requests and server controls.

BasePartialCachingControl

Provides the base functionality for the StaticPartialCachingControl and PartialCachingControl classes.

BaseTemplateParser

Implements ASP.NET template parsing for template files.

BindableTemplateBuilder

Supports page parsing of data-bound controls that automatically bind to an ASP.NET data source control within templated content sections. This class cannot be inherited.

BoundPropertyEntry

Represents a control property that is data-bound to an expression.

BuilderPropertyEntry

Serves as the base class for all property entries that require a control builder.

ChtmlTextWriter

Writes a series of cHTML-specific characters and text to the output stream of an ASP.NET server control. The ChtmlTextWriter class provides formatting capabilities that ASP.NET server controls use when rendering cHTML content to clients.

ClientScriptManager

Defines methods for managing client scripts in Web applications.

CodeStatementBuilder

Generates Code DOM statements.

CompiledBindableTemplateBuilder

Provides the default implementation of an IBindableTemplate object, which ASP.NET uses whenever it parses two-way data-binding within the templated content of an ASP.NET control such as FormView. This class cannot be inherited.

CompiledTemplateBuilder

An ITemplate implementation that is called from the generated page class code. This class cannot be inherited.

ComplexPropertyEntry

Serves as the property entry for read/write and read-only properties such as templates.

CompositeScriptReference

Represents a collection of script references to combine into a single composite script.

CompositeScriptReferenceEventArgs

Provides data for the ResolveCompositeScriptReference event.

ConstructorNeedsTagAttribute

Specifies that a server control needs a tag name in its constructor.

Control

Defines the properties, methods, and events that are shared by all ASP.NET server controls.

ControlBuilder

Supports the page parser in building a control and the child controls it contains.

ControlBuilderAttribute

Specifies a ControlBuilder class for building a custom control within the ASP.NET parser. This class cannot be inherited.

ControlCachePolicy

Provides programmatic access to an ASP.NET user control's output cache settings.

ControlCollection

Provides a collection container that enables ASP.NET server controls to maintain a list of their child controls.

ControlSkin

Represents a control skin, which is a means to define stylistic properties that are applied to an ASP.NET Web server control.

ControlValuePropertyAttribute

Specifies the default property of a control that a ControlParameter object binds to at run time. This class cannot be inherited.

CssClassPropertyAttribute

Adds Cascading Style Sheet (CSS) editing capabilities to a property at design time.

CssStyleCollection

Contains the HTML cascading-style sheets (CSS) inline style attributes for a specified HTML server control. This class cannot be inherited.

DataBinder

Provides support for rapid application development (RAD) designers to generate and parse data-binding expression syntax. This class cannot be inherited.

DataBinding

Contains information about a single data-binding expression in an ASP.NET server control, which allows rapid-application development (RAD) designers, such as Microsoft Visual Studio, to create data-binding expressions at design time. This class cannot be inherited.

DataBindingCollection

Provides a collection of DataBinding objects for an ASP.NET server control. This class cannot be inherited.

DataBindingHandlerAttribute

Specifies a design-time class that performs data binding of controls within a designer. This class cannot be inherited.

DataBoundLiteralControl

Retains data-binding expressions and static literal text. This class cannot be inherited.

DataControlExtensions

Provides extension methods that are used by ASP.NET Dynamic Data.

DataKeyPropertyAttribute

Specifies the default property of a control that the ControlParameter property binds to at run time.

DataSourceCacheDurationConverter

Provides a type converter to convert 32-bit signed integer objects to and from data source control cache duration representations.

DataSourceControl

Serves as the base class for controls that represent data sources to data-bound controls.

DataSourceControlBuilder

Supports the page parser in building controls that are connected to a data provider. This class cannot be inherited.

DataSourceSelectArguments

Provides a mechanism that data-bound controls use to request data-related operations from data source controls when data is retrieved. This class cannot be inherited.

DataSourceView

Serves as the base class for all data source view classes, which define the capabilities of data source controls.

DesignerDataBoundLiteralControl

Represents the design-time version of the DataBoundLiteralControl control. This class cannot be inherited.

DesignTimeParseData

Provides information to the parser during design time.

DesignTimeTemplateParser

Provides parsing at design time.

EmptyControlCollection

Provides standard support for a ControlCollection collection that is always empty.

EventEntry

Acts as the property entry for event handlers.

ExpressionBinding

Supports the parsing and persisting of an expression-binding instance. This class cannot be inherited.

ExpressionBindingCollection

Represents a collection of ExpressionBinding objects. This class cannot be inherited.

ExtenderControl

Provides an abstract base class for an extender control.

FileLevelControlBuilderAttribute

Allows a TemplateControl-derived class to specify the control builder used at the top level of the builder tree when parsing the file. This class cannot be inherited.

FileLevelMasterPageControlBuilder

Parses master page files.

FileLevelPageControlBuilder

Parses page files and is the default ControlBuilder class for parsing page files.

FileLevelUserControlBuilder

Supports the page parser in building a user control by specifying the FileLevelUserControlBuilder class that is used to parse the user control file.

FilterableAttribute

Specifies whether the property to which the attribute is applied supports device filtering. This class cannot be inherited.

HiddenFieldPageStatePersister

Stores ASP.NET page view state on the Web client in a hidden HTML element.

HierarchicalDataSourceControl

Provides a base class for data source controls that represent hierarchical data.

HierarchicalDataSourceView

Represents a data view on a node or collection of nodes in a hierarchical data structure for a HierarchicalDataSourceControl control.

HistoryEventArgs

Provides data for the Navigate event.

Html32TextWriter

Writes a series of HTML 3.2–specific characters and text to the output stream for an ASP.NET server control. The Html32TextWriter class provides formatting capabilities that ASP.NET server controls use when rendering HTML 3.2 content to clients.

HtmlTextWriter

Writes markup characters and text to an ASP.NET server control output stream. This class provides formatting capabilities that ASP.NET server controls use when rendering markup to clients.

IDReferencePropertyAttribute

Defines an attribute applied to properties that contain ID references. This class cannot be inherited.

ImageClickEventArgs

Provides data for any events that occur when a user clicks an image-based ASP.NET server control, such as the HtmlInputImage or ImageButton server controls. This class cannot be inherited.

IndexedString

Provides a utility string class that is used by the ObjectStateFormatter class to optimize object graph serialization. This class cannot be inherited.

ListSourceHelper

Used by data source controls when implementing the members defined by the IListSource interface. This class cannot be inherited.

LiteralControl

Represents HTML elements, text, and any other strings in an ASP.NET page that do not require processing on the server.

LosFormatter

Serializes the view state for a Web Forms page. This class cannot be inherited.

MasterPage

Acts as a template and merging container for pages that are composed only of Content controls and their respective child controls.

MasterPageControlBuilder

Acts as a merging class and container for content pages that are composed only of Content controls and their respective child controls.

NonVisualControlAttribute

Defines the attribute that indicates whether a control is treated as a visual or non-visual control during design time. This class cannot be inherited.

ObjectConverter

Converts an object from one object type to another object type. This class is obsolete. Use the Convert class and the Format(String, Object) method instead.

ObjectPersistData

During the build process, retains information about property entries.

ObjectStateFormatter

Serializes and deserializes object graphs that represent the state of an object. This class cannot be inherited.

ObjectTagBuilder

Used by the ASP.NET TemplateParser class to parse server-side <object> tags. This class can not be inherited.

OutputCacheParameters

Encapsulates the output cache initialization settings parsed from an @ OutputCache page directive by ASP.NET. This class cannot be inherited.

Page

Represents an .aspx file, also known as a Web Forms page, requested from a server that hosts an ASP.NET Web application.

PageAsyncTask

Contains information about an asynchronous task registered to a page. This class cannot be inherited.

PageHandlerFactory

Creates instances of classes that inherit from the Page class and implement the IHttpHandler interface. Instances are created dynamically to handle requests for ASP.NET files. The PageHandlerFactory class is the default handler factory implementation for ASP.NET pages.

PageParser

Implements a parser for .aspx files. This class cannot be inherited.

PageParserFilter

Provides an abstract base class for a page parser filter that is used by the ASP.NET parser to determine whether an item is allowed in the page at parse time.

PageStatePersister

Provides the base functionality for ASP.NET view state persistence mechanisms.

PageTheme

Represents the base class for a page theme, which is a collection of resources that are used to define a consistent look across pages and controls in a Web site. The page theme can be set through configuration or the page directive.

Pair

Provides a basic utility class that is used to store two related objects.

ParseChildrenAttribute

Defines a metadata attribute that you can use when developing ASP.NET server controls. Use the ParseChildrenAttribute class to indicate how the page parser should treat content nested inside a server control tag declared on a page. This class cannot be inherited.

ParseRecorder

Abstract base class for objects that need to be notified of parse events during page parsing.

PartialCachingAttribute

Defines the metadata attribute that Web Forms user controls (.ascx files) use to indicate if and how their output is cached. This class cannot be inherited.

PartialCachingControl

Created when a user control (.ascx file) is specified for output caching, using either the page directive or the PartialCachingAttribute attribute, and the user control is inserted into a page's control hierarchy by dynamically loading the user control with the LoadControl(String) method.

PersistChildrenAttribute

Defines an attribute that is used by ASP.NET server controls to indicate at design time whether nested content that is contained within a server control corresponds to controls or to properties of the server control. This class cannot be inherited.

PersistenceModeAttribute

Defines the metadata attribute that specifies how an ASP.NET server control property or event is persisted to an ASP.NET page at design time. This class cannot be inherited.

PostBackOptions

Specifies how client-side JavaScript is generated to initiate a postback event.

PostBackTrigger

Defines a control inside a UpdatePanel control as a postback control.

ProfileServiceManager

Configures a set of preloaded profile properties and the location of a custom implementation of the profile service.

PropertyConverter

Contains helper functions to convert property values to and from strings.

PropertyEntry

Acts as the base class for all property entry classes.

RegisteredArrayDeclaration

Provides access to an ECMAScript (JavaScript) array declaration that was previously registered with the Page object.

RegisteredDisposeScript

Provides access to a dispose script for a control that is inside an UpdatePanel control.

RegisteredExpandoAttribute

Provides access to the name/value pair of a custom (expando) attribute that was previously registered with the Page object.

RegisteredHiddenField

Provides access to a hidden value that was previously registered with the Page object.

RegisteredScript

Provides access to a client script that was previously registered with the Page object.

RenderTraceListener

Provides the abstract base class for an object that monitors as controls are rendering during a page request.

RoleServiceManager

Configures the location of a custom implementation of the role service.

RootBuilder

Supports the page parser in defining the behavior for how content is parsed.

ScriptBehaviorDescriptor

Extends the ScriptComponentDescriptor class to provide a wrapper for defining behaviors that are converted into client script.

ScriptComponentDescriptor

Provides a wrapper for converting server components into client script.

ScriptControl

Provides an abstract base class for a script control.

ScriptControlDescriptor

Defines a client control object.

ScriptDescriptor

When overridden in a derived class, defines script that creates an instance of a client class.

ScriptManager

Manages ASP.NET Ajax script libraries and script files, partial-page rendering, and client proxy class generation for Web and application services.

ScriptManagerProxy

Enables nested components such as content pages and user controls to add script and service references to pages when a ScriptManager control is already defined in a parent element.

ScriptReference

Registers an ECMAScript (JavaScript) file for use on an ASP.NET Web page.

ScriptReferenceBase

The base class for all script reference classes.

ScriptReferenceCollection

Represents a collection of script references.

ScriptReferenceEventArgs

Provides data for the ResolveScriptReference event.

ScriptResourceAttribute

Defines a resource in an assembly to be used from a client script file. This class cannot be inherited.

ScriptResourceDefinition

Defines the location of a script resource.

ScriptResourceMapping

Provides location mapping support for script resources.

ServiceReference

Registers a Web service for use in a Web page.

ServiceReferenceCollection

Contains a set of ServiceReference objects.

SessionPageStatePersister

Stores ASP.NET page view state on the Web server.

SimplePropertyEntry

Represents the definition of the control property and its value.

SimpleWebHandlerParser

Provides base functionality for parsing Web handler files.

SkinBuilder

Provides a ControlBuilder object used at design time to apply control skins to controls.

StateBag

Manages the view state of ASP.NET server controls, including pages. This class cannot be inherited.

StateItem

Represents an item that is saved in the StateBag class when view state information is persisted between Web requests. This class cannot be inherited.

StateManagedCollection

Provides a base class for all strongly typed collections that manage IStateManager objects.

StaticPartialCachingControl

Represents an instance of the UserControl class that is specified for output caching and included declaratively in a page or another user control.

SupportsEventValidationAttribute

Defines the metadata attribute that Web server controls use to indicate support for event validation. This class cannot be inherited.

TagPrefixAttribute

Defines the tag prefix used in a Web page to identify custom controls. This class cannot be inherited.

TargetControlTypeAttribute

Extends the Attribute class to indicate the type of server control that an extender control can be applied to.

TemplateBuilder

Supports the page parser in building a template and the child controls it contains.

TemplateContainerAttribute

Declares the base type of the container control of a property that returns an ITemplate interface and is marked with the TemplateContainerAttribute attribute. The control with the ITemplate property must implement the INamingContainer interface. This class cannot be inherited.

TemplateControl

Provides the Page class and the UserControl class with a base set of functionality.

TemplateControlParser

Implements ASP.NET template parsing for template controls.

TemplateInstanceAttribute

Defines a metadata attribute that is used to specify the number of allowed instances of a template. This class cannot be inherited.

TemplateParser

Serves as the abstract base class for ASP.NET file parsers.

TemplatePropertyEntry

Enables property entry for ITemplate class properties.

ThemeableAttribute

Defines the metadata attribute that Web server controls and their members use to indicate whether their rendering can be affected by themes and control skins. This class cannot be inherited.

ThemeProvider

Provides a class that encapsulates theme and style sheet information for controls in a designer environment.

Timer

Performs asynchronous or synchronous Web page postbacks at a defined interval.

ToolboxDataAttribute

Specifies the default tag generated for a custom control when it is dragged from a toolbox in a tool such as Microsoft Visual Studio.

Triplet

Provides a basic utility class that is used to store three related objects.

UpdatePanel

Enables sections of a page to be partially rendered without a postback.

UpdatePanelControlTrigger

Provides a common base class for controls that can be triggers for UpdatePanel controls.

UpdatePanelTrigger

Provides a common base class for objects that can be triggers for UpdatePanel controls.

UpdatePanelTriggerCollection

Represents a collection of UpdatePanelTrigger objects for an UpdatePanel control.

UpdateProgress

Provides visual feedback in the browser when the contents of one or more UpdatePanel controls are updated.

UrlPropertyAttribute

Defines the attribute that controls use to identify string properties containing URL values. This class cannot be inherited.

UserControl

Represents an .ascx file, also known as a user control, requested from a server that hosts an ASP.NET Web application. The file must be called from a Web Forms page or a parser error will occur.

UserControlControlBuilder

Supports the ASP.NET page parser in building an instance of a user control.

ValidationPropertyAttribute

Defines the metadata attribute that ASP.NET server controls use to identify a validation property. This class cannot be inherited.

ValidationSettings

Provides client validation settings for the application.

ValidatorCollection

Exposes an array of IValidator references. This class cannot be inherited.

VerificationAttribute

Defines the metadata attribute of a Web content accessibility rule. This class cannot be inherited.

ViewStateException

Represents the exception that is thrown when the view state cannot be loaded or validated. This class cannot be inherited.

ViewStateModeByIdAttribute

Defines the metadata attribute that ASP.NET server controls use to specify whether they participate in loading view-state information by ID. This class cannot be inherited.

WebResourceAttribute

Defines the metadata attribute that enables an embedded resource in an assembly. This class cannot be inherited.

WebServiceParser

Provides a parser for Web service handlers.

XhtmlTextWriter

Writes Extensible Hypertext Markup Language (XHTML)-specific characters, including all variations of XHTML modules that derive from XTHML, to the output stream for an ASP.NET server control for mobile devices. Override the XhtmlTextWriter class to provide custom XHTML rendering for ASP.NET pages and server controls.

XPathBinder

Provides support for rapid application development (RAD) designers to parse data-binding expressions that use XPath expressions. This class cannot be inherited.

Interfaces

IAttributeAccessor

Defines methods used by ASP.NET server controls to provide programmatic access to any attribute declared in the opening tag of a server control.

IAutoFieldGenerator

Defines a method that automatically generates fields for data-bound controls that use ASP.NET Dynamic Data features.

IBindableControl

Defines a method that enables field template controls to implement two-way data-binding.

IBindableTemplate

Provides a way for ASP.NET data-bound controls, such as DetailsView and FormView, to automatically bind to an ASP.NET data source control within templated content sections.

ICallbackEventHandler

Used to indicate that a control can be the target of a callback event on the server.

ICheckBoxControl

Defines the property and event a control implements to act as a check box.

ICodeBlockTypeAccessor

Provides access to the CodeBlockType of a code block builder.

IControlBuilderAccessor

Allows the control serializer to get to the builder for a control.

IControlDesignerAccessor

Provides access to a control designer to store temporary design-time data associated with a control.

IDataBindingsAccessor

Allows access to the collection of data-binding expressions on a control at design time.

IDataItemContainer

Enables data-bound control containers to identify a data item object for simplified data-binding operations.

IDataKeysControl

Defines properties that specify how ASP.NET creates client IDs for a data-bound control.

IDataSource

Represents an abstract data source that data-bound controls bind to.

IDataSourceViewSchemaAccessor

Allows a type converter to access schema information stored on an object.

IEditableTextControl

Represents a control that renders text that can be changed by the user.

IExpressionsAccessor

Defines the properties a class must implement to support collections of expressions.

IExtenderControl

Defines the behavior for an extender control.

IFilterResolutionService

Provides an interface that designer developers can use to evaluate device filters by name.

IHierarchicalDataSource

Represents a hierarchical data source that hierarchical data-bound controls such as TreeView can bind to.

IHierarchicalEnumerable

Represents a hierarchical collection that can be enumerated with an IEnumerator interface. Collections that implement the IHierarchicalEnumerable interface are used by ASP.NET site navigation and data source controls.

IHierarchyData

Exposes a node of a hierarchical data structure, including the node object and some properties that describe characteristics of the node. Objects that implement the IHierarchyData interface can be contained in IHierarchicalEnumerable collections, and are used by ASP.NET site navigation and data source controls.

INamingContainer

Identifies a container control that creates a new ID namespace within a Page object's control hierarchy. This is a marker interface only.

INavigateUIData

Provides an interface that classes implement to provide navigation user interface data and values to navigation controls.

IParserAccessor

Defines the method that ASP.NET server controls must implement to recognize when elements, either HTML or XML, are parsed.

IPostBackDataHandler

Defines methods that ASP.NET server controls must implement to automatically load postback data.

IPostBackEventHandler

Defines the method ASP.NET server controls must implement to handle postback events.

IResourceUrlGenerator

Defines the method that a designer-host must implement to provide URL reference look-up for embedded resources.

IScriptControl

Defines methods that ASP.NET server controls must implement to define ECMAScript (JavaScript) resources in AJAX-enabled applications.

IStateFormatter

Defines methods that a type implements to serialize and deserialize an object graph.

IStateManager

Defines the properties and methods any class must implement to support view state management for a server control.

IStyleSheet

Defines the methods that a class must implement in order to support the creation of style rules.

ITemplate

Defines the behavior for populating a templated ASP.NET server control with child controls. The child controls represent the inline templates defined on the page.

ITextControl

Defines the interface a control implements to get or set its text content.

IThemeResolutionService

Provides an interface that designer tool developers can use to supply a set of ThemeProvider objects, which can be used to apply themes and control skins to controls in a design-time environment.

IUrlResolutionService

Defines a service implemented by objects to resolve relative URLs based on contextual information.

IUserControlDesignerAccessor

Defines the properties that allow the designer to access information about a user control at design time.

IUserControlTypeResolutionService

Defines the method a class must implement to return a control's type for a specified tag prefix and tag name.

IValidator

Defines the properties and methods that objects that participate in Web Forms validation must implement.

Enums

AjaxFrameworkMode

Specifies how client scripts of the Microsoft Ajax client library are included on the client.

ClientIDMode

Specifies how ASP.NET generates the ClientID for a control that can be accessed in client script.

CodeBlockType

Specifies the type of the code block.

CodeConstructType

Specifies the code constructs that can be parsed in the ProcessCodeConstruct(CodeConstructType, String) method of the PageParserFilter class.

CompilationMode

Defines constants that specify how ASP.NET should compile .aspx pages and .ascx controls.

ConflictOptions

Determines how ASP.NET data source controls handle data conflicts when updating or deleting data.

DataSourceCacheExpiry

Describes the way data cached using ASP.NET caching mechanisms expires when a time-out is set.

DataSourceCapabilities

Provides a way to request processing beyond record retrieval for a data retrieval operation of a data source control.

DataSourceOperation

Specifies a data operation performed by a data source control.

HtmlTextWriterAttribute

Specifies the HTML attributes that an HtmlTextWriter or Html32TextWriter object writes to the opening tag of an HTML element when a Web request is processed.

HtmlTextWriterStyle

Specifies the HTML styles available to an HtmlTextWriter or Html32TextWriter object output stream.

HtmlTextWriterTag

Specifies the HTML tags that can be passed to an HtmlTextWriter or Html32TextWriter object output stream.

OutputCacheLocation

Specifies the valid values for controlling the location of the output-cached HTTP response for a resource.

PersistenceMode

Specifies how an ASP.NET server control property or event is persisted declaratively in an .aspx or .ascx file.

RegisteredScriptType

Specifies the type of client script block that is represented by a RegisteredScript object.

ScriptMode

Specifies whether ScriptManager and ScriptReference objects refer to the debug or release version of client scripts.

TemplateInstance

Specifies how many times an instance of a template can be created.

UnobtrusiveValidationMode

Specifies behavior of unobtrusive validation.

UpdatePanelRenderMode

Represents the possible layout rendering options for the content of an UpdatePanel control on a page.

UpdatePanelUpdateMode

Represents the possible update modes for the content in an UpdatePanel control.

ValidateRequestMode

Specifies the type of request validation for a control.

VerificationConditionalOperator

Specifies operators for a conditional expression used in a VerificationAttribute class.

VerificationReportLevel

Specifies reporting levels for an accessibility rule defined by an VerificationAttribute instance.

VerificationRule

Specifies how conditional expressions defined by an VerificationAttribute instance are used in verification.

ViewStateEncryptionMode

Specifies whether view-state information is encrypted.

ViewStateMode

Specifies whether view state will be enabled for a control.

VirtualReferenceType

Specifies the type of resource referenced by a parsed virtual path.

XhtmlMobileDocType

Specifies the type of XHTML for the XhtmlTextWriter class to render to the page or control.

Delegates

BuildMethod

Represents the method that is used to build a control.

BuildTemplateMethod

Supports ASP.NET during the creation of a template for a templated control from generated class code. The BuildTemplateMethod delegate handles the InstantiateIn(Control) method.

ControlSkinDelegate

Represents the method that applies the correct control skin to the specified control.

DataSourceViewOperationCallback

Represents the asynchronous callback method that a data-bound control supplies to a data source view for asynchronous insert, update, or delete data operations.

DataSourceViewSelectCallback

Represents the asynchronous callback method that a data-bound control supplies to a data source view for asynchronous data retrieval.

ExtractTemplateValuesMethod

Provides a delegate with which ASP.NET extracts a set of name/value pairs from an IBindableTemplate object at run time. This class cannot be inherited.

ImageClickEventHandler

Represents the method that handles any events that are raised when a user clicks an image-based ASP.NET server control.

RenderMethod

Represents the method that renders the specified Control container to the specified HtmlTextWriter.

Remarks

This namespace includes the Control class, which provides a common set of functionality for all server controls, which includes HTML server controls, Web server controls, and user controls. It also includes the Page class. This class is generated automatically whenever a request is made for an .aspx file in an ASP.NET Web application. You can inherit from both of these classes.

The namespace also includes classes that provide the server controls with data-binding functionality, the ability to save the view state of a given control or page, and parsing functionality.