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.

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.

Classes

TypeReason
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.

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.

BoundPropertyEntry

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

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 CompiledTemplateBuilder.InstantiateIn(Control) method.

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.

CompilationMode

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

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.

ConflictOptions

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

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.

ControlSkinDelegate

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

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.

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.

DataSourceOperation

Specifies a data operation performed by a data source control.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

IDReferencePropertyAttribute

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

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.

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.

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.

ImageClickEventHandler

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

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.

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.

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 String.Format(String,Object) method instead.

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.

OutputCacheLocation

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

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.

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.

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 @ OutputCache 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 TemplateControl.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.

PersistenceMode

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

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.

PropertyConverter

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

PropertyEntry

Acts as the base class for all property entry classes.

RenderMethod

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

RootBuilder

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

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.

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.

TemplateInstance

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

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.

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.

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.

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.

ValidatorCollection

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

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.

VirtualReferenceType

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

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.

XhtmlMobileDocType

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

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.