The System.Web.UI.Design namespace contains classes that can be used to extend design-time support for Web Forms pages and Web server controls.

	Class	Description
	AppSettingsExpressionEditor	Provides properties and methods for evaluating and editing an application setting expression in a configuration file at design time.
	CalendarDataBindingHandler	Provides a data-binding handler for a calendar.
	ClientScriptItem	Represents a client script element in a Web Form or user control at design time. This class cannot be inherited.
	ClientScriptItemCollection	Represents a read-only collection of client script blocks that are contained within a Web Form or user control at design time. This class cannot be inherited.
	ColorBuilder	Provides an HTML color string builder at design time that allows a user to select a color.
	ConnectionStringEditor	Provides a base class for a user interface to select and edit a connection string property at design time.
	ConnectionStringsExpressionEditor	Provides properties and methods for selecting a data connection expression that is associated with a control property at design time.
	ContainerControlDesigner	Provides designer functionality for controls that contain child controls or properties that can be modified at design time.
	ContentDefinition	Provides a property structure that defines Web content at design time.
	ControlDesigner	Provides a base control designer class for extending the design-mode behavior of a Web server control.
	ControlDesignerState	Provides access to the state of the control designer in the design host through the IComponentDesignerStateService interface. This class cannot be inherited.
	ControlParser	Provides methods for creating a Web Server Control control or ITemplate interface from a string of aspx code that represents a persisted control or template.
	ControlPersister	Provides methods for persisting Web server controls at design-time.
	DataBindingCollectionConverter	Provides a type converter for DataBindingCollection objects.
	DataBindingCollectionEditor	Provides a user interface for editing a collection of data bindings.
	DataBindingHandler	Provides a base class for a data-binding handler.
	DataBindingValueUIHandler	Provides a UI handler for data binding values.
	DataColumnSelectionConverter	Provides a type converter for a property representing the field name of a bound column field in a GridView control.
	DataFieldConverter	Provides a type converter that can retrieve a list of data fields from the current component's selected data source.
	DataMemberConverter	Provides a type converter that can retrieve a list of data members from the current component's selected data source.
	DataSetFieldSchema	Represents the structure, or schema, of a data field.
	DataSetSchema	The DataSetSchema class represents the structure, or schema, of a data source. This class cannot be inherited.
	DataSetViewSchema	Represents the structure, or schema, of a DataTable. This class cannot be inherited.
	DataSourceBooleanViewSchemaConverter	Provides a type converter for a property representing a Boolean field in a data source schema.
	DataSourceConverter	Provides a type converter that can retrieve a list of data sources accessible to the current component.
	DataSourceDesigner	Provides design-time support in a design host for the DataSourceControl class.
	DataSourceViewSchemaConverter	Provides a type converter for a property representing a field in a data source schema.
	DesignerAutoFormat	Provides the abstract base class for creating formats that can be applied to a custom Web server control at design time.
	DesignerAutoFormatCollection	Represents a collection of DesignerAutoFormat objects within a control designer. This class cannot be inherited.
	DesignerAutoFormatStyle	Represents the style for a DesignerAutoFormat object. This class is used primarily by control developers.
	DesignerDataSourceView	Serves as the base class for design-time data source view classes.
	DesignerHierarchicalDataSourceView	Provides a base class for designers for data views based on hierarchical data. This class must be inherited.
	DesignerObject	Represents an object in a design host such as Visual Studio 2005. This class must be inherited.
	DesignerRegion	Defines a region of content within the design-time markup for the associated control.
	DesignerRegionCollection	Represents a collection of DesignerRegion objects within a control designer.
	DesignerRegionMouseEventArgs	Provides data for a ViewEvent event that is raised when you click on a selected control or a designer region in a selected control. This class cannot be inherited.
	DesignTimeData	Provides helper methods that can be used by control designers to generate sample data for data-bound properties at design time. This class cannot be inherited.
	DesignTimeResourceProviderFactory	Used by control localization to read and write resources at design time.
	EditableDesignerRegion	Represents an editable content region within the design-time markup for the associated control.
	ExpressionEditor	Defines a set of properties and methods for evaluating an expression that is associated with a control property at design time and to provide an expression editor sheet to the visual design host for use in the expression editor dialog box. This class is abstract.
	ExpressionEditorSheet	Represents a design-time editor sheet for a custom expression. This class must be inherited.
	ExpressionsCollectionConverter	Provides a type converter for expression binding collections.
	ExpressionsCollectionEditor	Provides a user interface for selecting and editing an expressions binding collection at design time.
	HierarchicalDataSourceConverter	Provides a type converter that can retrieve a list of the hierarchical data sources that are accessible to the current component.
	HierarchicalDataSourceDesigner	Provides design-time support in a visual designer for the HierarchicalDataSourceControl control.
	HtmlControlDesigner	Provides basic design-time functionality for ASP.NET server controls.
	HtmlIntrinsicControlDesigner	Provides a base designer for all intrinsic HTML controls.
	HyperLinkDataBindingHandler	Provides a data-binding handler for a hyperlink property.
	ImageUrlEditor	Provides a user interface for selecting a URL that references an image.
	MailFileEditor	Provides a user interface for selecting and editing a mail file name for a property at design time.
	MdbDataFileEditor	Provides a design-time user interface for selecting a Microsoft Access database file.
	ReadWriteControlDesigner	Extends design-time behavior for read/write server controls.
	ResourceExpressionEditor	Provides properties and methods for evaluating and editing a resource expression at design time.
	ResourceExpressionEditorSheet	Represents a design-time editor sheet for the properties of a resource expression in the UI of a designer host at design time.
	SkinIDTypeConverter	Provides a list of valid skin IDs for a control at design time, based on the currently applicable theme.
	SupportsPreviewControlAttribute	Indicates whether a control designer requires a preview instance of the control at design time. This class cannot be inherited.
	TemplatedControlDesigner	Extends design-time behavior for template-based server controls.
	TemplatedEditableDesignerRegion	Defines an editable region of content within the design-time markup for the associated control.
	TemplateDefinition	Provides properties and methods that define a template element in a Web server control at design time.
	TemplateEditingService	Provides services for editing control templates at design time. This class cannot be inherited.
	TemplateEditingVerb	Represents a designer verb that creates a template editing frame, and that can be invoked only by a template editor.
	TemplateGroup	A collection of TemplateDefinition objects representing the template elements in a Web server control at design time.
	TemplateGroupCollection	Represents a collection of TemplateGroup objects within a control designer. This class cannot be inherited.
	TemplateModeChangedEventArgs	Provides data for a ViewEvent event that is raised when the template mode changes for a control on the design surface.
	TextControlDesigner	Extends design-time behavior for Web server controls that have a Text property that is persisted as inner text.
	TextDataBindingHandler	Provides a data-binding handler for a data-bound control at design time.
	TypeSchema	Represents the structure, or schema, of an object type.
	UrlBuilder	Starts a URL editor that allows a user to select or create a URL. This class cannot be inherited.
	UrlEditor	Provides a user interface for selecting a URL.
	UserControlDesigner	Provides designer functionality for user controls.
	UserControlFileEditor	Provides a dialog box for selecting files to edit at design time.
	ViewEvent	Represents the kind of event that has occurred on a view of a control at design time. This class cannot be inherited.
	ViewEventArgs	Provides data for the ViewEvent event.
	ViewRendering	Contains the design-time markup for content and regions at design time.
	WebControlToolboxItem	Provides a base class for a Web server control ToolboxItem.
	WebFormsDesignerActionService	Establishes a design-time service that manages the collection of DesignerActionItem objects for a component.
	WebFormsReferenceManager	Provides a base class for accessing the types, directives, and controls in the current Web project document. This class must be inherited.
	WebFormsRootDesigner	Provides a base class for the design-time functionality of a Web Forms page and allows access to and manipulation of components and controls that are contained within the Web Forms page at design time.
	XmlDataFileEditor	Provides a design-time user interface for selecting an XML data file.
	XmlDocumentSchema	Represents the structure, or schema, of an XmlDocument. This class cannot be inherited.
	XmlFileEditor	Provides a user interface for selecting an XML file using a standard OpenFileDialog box.
	XmlUrlEditor	Provides a user interface for selecting a URL that indicates the location of an XML file.
	XsdSchemaFileEditor	Provides a design-time user interface for selecting an XML schema definition file.
	XslTransformFileEditor	Provides a design-time user interface for selecting an XML transform file.
	XslUrlEditor	Provides a user interface for selecting an URL that indicates the location of an XSL file.

Interfaces

---

	Interface	Description
	IContentResolutionService	Provides an interface for access to a master page from a content page at design time, if provided by a design host, such as Visual Studio 2005.
	IControlDesignerBehavior	Enables the extension of specific behaviors of a control designer.
	IControlDesignerTag	Provides an interface for design-time access to the HTML markup for a control that is associated with a control designer.
	IControlDesignerView	Provides an interface for access to the visual representation and content of a control at design time.
	IDataBindingSchemaProvider	Provides an interface for design-time access to a schema provider in a design host.
	IDataSourceDesigner	Defines the basic functionality for a data source designer.
	IDataSourceFieldSchema	Provides basic functionality for describing the structure of a data field at design time.
	IDataSourceProvider	Defines an interface that a control designer can implement to provide access to a data source.
	IDataSourceSchema	Provides basic functionality for describing the structure of a data source at design time.
	IDataSourceViewSchema	Defines a set of methods and properties used to examine a data source.
	IDesignTimeResourceProviderFactoryService	Provides an interface for creating a custom DesignTimeResourceProviderFactory class.
	IDesignTimeResourceWriter	Used by the DesignTimeResourceProviderFactory class to localize data at design time.
	IDocumentProjectItem	Provides an interface for accessing a document item retrieved from a design host at design time.
	IFolderProjectItem	Provides an interface for a project folder in a design host, such as Visual Studio 2005.
	IHierarchicalDataSourceDesigner	Provides design-time support in a visual designer for a class that is derived from the HierarchicalDataSourceControl class.
	IHtmlControlDesignerBehavior	Defines an interface that enables the extension of specific behaviors of an HTML control designer.
	IProjectItem	Provides an interface for an item that is retrieved at design time from a design host, such as Visual Studio 2005.
	ITemplateEditingFrame	Provides an interface to manage a template editing area.
	ITemplateEditingService	Provides services for editing control templates at design time.
	IWebAdministrationService	Provides an interface for creating services for administering a Web site at design time.
	IWebApplication	Provides an interface for accessing a Web application in a design host, such as Microsoft Visual Studio 2005, at design time.
	IWebFormReferenceManager	Provides an interface that can look up information about the types used in the current Web Forms project.
	IWebFormsBuilderUIService	Provides methods to start specific user interfaces for building properties at design-time.
	IWebFormsDocumentService	Provides methods to access services for tracking the loading state of a Web Forms document, handling events at load time, accessing a document's location, managing a document's undo service, and setting a new selection within the document.

Delegates

---

	Delegate	Description
	TransactedChangeCallback	A delegate that refers to a method in a custom DesignerActionList object that is to be called by the InvokeTransactedChange method for implementing property changes in the designer's associated control.
	ViewEventHandler	Represents the method that will handle the ViewEvent event that is raised by visual design tools, such as Visual Studio 2005, implementing the IControlDesignerView interface. This class cannot be inherited.

Enumerations

---

	Enumeration	Description
	ContentDesignerState	Enumerates the possible settings for the state of a ContentDesigner control at design time.
	ControlLocation	Specifies the possible locations for adding a control in a container.
	UrlBuilderOptions	Defines identifiers for settings of a UrlBuilder.
	ViewFlags	Indicates which features are enabled with the SetViewFlags method of a designer.