System.Web.UI.Page

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System.Web.UI.Page

The System.Web.UI.Page class provides server-side events and capabilities for a .aspx file. It includes properties ( specifically , Application , Context , Request , Response , Session , and Server ) to quickly access contextual information. Table A.1 lists the methods of the Page class, Table A.2 lists the available properties of the Page class, and Table A.4 lists the available events of the Page class.

Table A.1. Methods of the System.Web.UI.Page Class

Method Name	Description
DataBind	Binds a data source to the page and all its child controls.
DeterminePostBackMode	Determines if the page was the result of an HTTP POST or GET postback operation. If it was not a postback request, null is returned in C# ( Nothing in Visual Basic). If it was an HTTP POST postback, the Form collection information is returned. If it was an HTTP GET postback, the QueryString collection information is returned.
FindControl	Finds a specified server control.
GetPostBackClientEvent	Obtains a reference to a client-side script function that causes a server postback when invoked.
GetPostBackClientHyperlink	Appends JavaScript to the beginning of the return from a GetPostBackEventReference call to allow hyperlink postback processing on the server. Returns the name of the client-side function and the ID property of the server control that processed the function and argument passed to the control.
HasControls	Determines if the server control contains any child controls.
GetPostBackEventReference	Obtains a reference to a client-side script function that causes a server postback when invoked.
IsClientScriptBlockRegistered	Determines if a named client script block is already registered within the page.
IsStartupScriptRegistered	Determines if a named startup script block is already registered within the page.
LoadPageStateFromPersistenceMedium	Loads the view state information from the specified persistence medium. Stores view state in a medium other than hidden form variables .
MapPath	Retrieves the physical path for a virtual path .
ParseControl	Parses a string argument to create a System.Web.UI.Control object reference.
RaisePostBackEvent	Notifies the server control that caused the postback that it must handle an incoming postback event.
RegisterArrayDeclaration	Creates a client-side array declaration and populates it with the specified contents.
RegisterClientScriptBlock	Creates a client-side script block from server controls.
RegisterHiddenField	Registers a hidden form field from a server control.
RegisterOnSubmitStatement	Registers a client-side script (registered with RegisterClientScriptBlock ) to respond to a client OnSubmit event.
RegisterRequiresPostBack	Registers a control as requiring postback handling.
RegisterRequiresRaiseEvent	Registers a server control as requiring a page process event.
RegisterStartupScript	Registers a client-side script (previously registered with RegisterClientScriptBlock ) as a startup script.
RegisterViewStateHandler	Persists the page view state.
SavePageStateToPersistenceMedium	Saves the page view state to the specified object.
Validate	Instructs validation controls in the page to perform validation.
VerifyRenderingInServerForm	Confirms that a System.Web.UI.HtmlControls.HtmlForm control is rendered for the specified ASP.NET server control at run-time.

Table A.2. Properties of the System.Web.UI.Page Class

Property Name	Description
Application	Gets a reference to the HttpApplicationState (application intrinsic object) instance object for the current application.
Cache	Gets the System.Web.Caching.Cache object associated with the application to which the page belongs.
ClientTarget	Disables browser capabilities detection and uses the capabilities defined in web.config .
Context	Gets an HttpContext (context intrinsic control) instance object, allowing access to the context under which the web server processes requests .
EnableViewState	Gets or sets a Boolean indicating if the page (and any server controls it contains) maintains its view state when the current request ends.
ErrorPage	Gets or sets the page that is redirected to in case of an unhandled exception within the page.
ID	Gets or sets an identifier for the page.
IsPostBack	Gets a value indicating if the page is being loaded as the result of a postback operation.
IsValid	Gets a value indicating if page validation succeeded.
Request	Gets the HttpRequest (request intrinsic object) instance object for the current request, allowing access to HTTP information, such as POST and GET data.
Response	Gets the HttpResponse (response intrinsic object) instance object for the current request.
Server	Gets the HttpServerUtility (server intrinsic object) instance object for the current web request, providing utility functions for use in the current application.
Session	Gets the HttpSessionState (session intrinsic object) instance object for the current web request, enabling access to state persistence between stateless requests.
SmartNavigation	Gets or sets a value indicating if smart navigation is enabled.
Trace	Gets the System.Web.TraceContext instance object for the current web request, enabling access to performance information.
User	Gets a System.Security.IPrincipal interface object representing the current user's identity and roles.
Validators	Gets a ValidatorCollection collection of the validation controls for the page.
Visible	Gets or sets a Boolean indicating if the page is to be rendered.

Table A.3. Events of the System.Web.UI.Page Class

Event Name	Occurs When
AbortTransaction	A transaction is aborted.
CommitTransaction	A transaction is completed.
DataBinding	The server control binds to a data source.
Disposed	A server control is released from memory.
Error	An unhandled exception occurs.
Init	The server control is initialized .
Load	The server control is loaded into the Page object.
PreRender	A server control is about to render to its containing Page object.
Unload	The server control is unloaded from memory.

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