create a qr code using c# and asp.net Composing the Progress Screen in Visual C#

Print QR Code in Visual C# Composing the Progress Screen

Composing the Progress Screen
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The control displays the contents of the ProgressTemplate property while waiting for a panel to update. You can specify the template either declaratively or programmatically. In the latter case, you assign the property any object that implements the ITemplate interface. For the former situation, you can easily specify the progress control s markup declaratively, as shown in the following code:
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<asp:UpdateProgress runat="server" ID="UpdateProgress1"> <ProgressTemplate> ... </ProgressTemplate> </asp:UpdateProgress>
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You can place any combination of controls in the progress template. However, most of the time, you ll probably just put some text there and an animated GIF. (See Figure 20-3.)
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Part V
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The Client Side Panel #2
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Panel #1
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Refresh Panel #1 Last updated on 12/3/20 1:28:23 PM
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Update in progress for panel #1 1:28:12
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FIGURE 20-3 A progress template informing users that some work is being done.
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Note that the UpdateProgress control is not designed to be a gauge component, but rather a user-defined panel that the ScriptManager control shows before the panel refresh begins and that it hides immediately after its completion. Important If you re looking for a real gauge bar to monitor the progress of a server-side task,
partial rendering and the UpdateProgress control are not the right tools. As you ll see later in the chapter, polling is one of the main drawbacks of partial rendering and polling is unavoidable for monitoring server tasks from the client.
Client-Side Events for Richer Feedback
Each asynchronous postback is triggered on the client via script. The entire operation is conducted by the PageRequestManager client object, which invokes, under the hood, the XMLHttpRequest object. What kind of control do developers have on the underlying operation If you manage XMLHttpRequest directly, you have full control over the request and response. But when these key steps are managed for you, there s not much you can do unless the request manager supports an eventing model. The Sys.WebForms.PageRequestManager object provides a few events so that you can customize the handling of the request and response. Table 20-7 lists the supported events that signal the main steps around an Ajax postback that partially update a page. The events are listed in the order in which they fire to the client page.
TABLE 20-7
Properties of the UpdateProgress Control
Event Argument
InitializeRequestEventArgs BeginRequestEventArgs PageLoadingEventArgs PageLoadedEventArgs EndRequestEventArgs
Event
initializeRequest beginRequest pageLoading pageLoaded endRequest
Description
Occurs before the request is prepared for sending Occurs before the request is sent Occurs when the response has been acquired but before any content on the page is updated Occurs after all content on the page is refreshed as a result of an asynchronous postback Occurs after an asynchronous postback is finished and control has been returned to the browser
20 Ajax Programming
To register an event handler, you use the following JavaScript code:
var manager = Sys.WebForms.PageRequestManager.getInstance(); manager.add_beginRequest(OnBeginRequest);
The prototype of the event handler method OnBeginRequest in this case is shown here:
function beginRequest(sender, args)
The real type of the args object, though, depends on the event data structure. By using any of these events, you can control in more detail the steps of an asynchronous request. Let s dig out more. The initializeRequest event is the first in the client life cycle of an asynchronous request. The life cycle begins at the moment a postback is made that is captured by the UpdatePanel s client-side infrastructure. You can use the initializeRequest event to evaluate the postback source and do any additional required work. The event data structure is the InitializeRequestEventArgs class. The class features three properties: postBackElement, request, and cancel. The postBackElement property is read-only and evaluates to a DomElement object. It indicates the DOM element that is responsible for the postback. The request property (read-only) is an object of type Sys.Net.WebRequest and represents the ongoing request. Finally, cancel is a read-write Boolean property that can be used to abort the request before it is sent. Immediately after calling the initializeRequest handler, if any, the PageRequestManager object aborts any pending async requests. Next, it proceeds with the beginRequest event and then sends the packet. When the response arrives, the PageRequestManager object first processes any returned data and separates hidden fields, updatable panels, and whatever pieces of information are returned from the server. Once the response data is ready for processing, the PageRequestManager object fires the pageLoading client event. The event is raised after the server response is received but before any content on the page is updated. You can use this event to provide a custom transition effect for updated content or to run any clean-up code that prepares the panels for the next update. The event data is packed in an instance of the class PageLoadingEventArgs. The class has three properties: panelsUpdating, panelsDeleting, and dataItems. The first two are arrays and list the updatable panels to be updated and deleted, respectively. The pageLoaded event is raised after all content on the page is refreshed. You can use this event to provide a custom transition effect for updated content, such as flashing or highlighting updated contents. The event data is packed in the class PageLoadedEventArgs, which has three properties: panelsUpdated, panelsDeleted, and dataItems. The first two are arrays and list the updatable panels that were just updated and deleted, respectively.
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