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In complex pages, you might have more than one UpdatePanel. In this case, when one UpdatePanel triggers an update, all the UpdatePanel regions will be refreshed. If you have more than one UpdatePanel and each one is completely self-contained, this isn t necessary. In this situation, you can configure the panels to update themselves independently. Simply change the UpdatePanel.UpdateMode property from Always to Conditional. Now, the UpdatePanel will refresh itself only if an event occurs in one of the controls in that UpdatePanel. To try this out, create a page that has several UpdatePanel controls, each with its own time display and button. Then, add code that places the current time in the label of all three controls: protected void Page_Load(object sender, EventArgs e) { lblTime1.Text = DateTime.Now.ToLongTimeString(); lblTime2.Text = DateTime.Now.ToLongTimeString(); lblTime3.Text = DateTime.Now.ToLongTimeString(); } Now, when you click one of the Refresh Time buttons, only the label in that panel will be updated. The other panels will remain untouched.

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Note There s an interesting quirk here. Technically, when you click the button all the labels are updated, but

Tip If you look at the Custom tab for the device from the desktop RFID Manager, you will see a number of

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only part of the page is refreshed to show that fact. The next time the page is posted back, the most recent values are pulled out of view state and applied to all the labels, including the ones that weren t refreshed on the client. Most of the time, this distinction isn t important. But if this isn t the behavior you want in this example, you could use a separate event handler for each button. Each event handler would update just one label the label that s in the appropriate UpdatePanel. That way, when the page is posted back just one label is changed, and you don t waste time changing parts of the page that won t be updated in the browser.

There s one caveat with this approach. If you perform an update that takes a long time, it could be interrupted by another update. As you know, ASP.NET AJAX posts the page back asynchronously, so the user is free to click other buttons while the postback is under way. ASP.NET AJAX doesn t allow concurrent updates, because it needs to ensure that other information such as the page view state information, the session cookie, and so on remains consistent. Instead, when a new asynchronous postback is started, the previous asynchronous postback is abandoned. For the most part, this is the behavior you want. If you want to prevent the user from interrupting an asynchronous postback, you can add JavaScript code that disables controls while the asynchronous postback is under way, but this takes significantly more work. Another option is to use the UpdateProgress control discussed later in this chapter.

0, 0, 1 };

Tip There s one other way to update a conditional UpdatePanel you can call the UpdatePanel.Update()

LLRP properties. These are really intended for LLRP devices, and are not truly applicable to mobile devices. Scroll past them, and near the end you will see a category called RFID Mobile, which contains the custom settings that are valid for BizTalk RFID Mobile devices.

method from your server-side code. This allows you to decide on the fly whether a certain panel should be refreshed. However, you must be careful not to call Update() on a panel that uses an UpdateMode of Always, and you must not call Update() after the page has been rendered. If you make either of these mistakes, you ll cause an exception.

VertexArray textureArray = new VertexArray(texturecords.length / 2, 2, 2); textureArray.set(0, texturecords.length/2, texturecords);

So far, the examples you ve seen have used the built-in behavior of the UpdatePanel In the next example, you ll use the UpdatePanel in a slightly more sophisticated page, and you ll learn to control its refreshes with triggers Earlier in this book, you learned how to build a web page that allows the user to dynamically build a greeting card This page lets the user specify several details such as text, font, colors, border options, and so on and then updates a portion of the page to show the greeting card 6 demonstrated two versions of the greeting card maker The first version allowed the user to specify a number of options at once, and then click a button to update the greeting card The second version used automatic postback events, so that the greeting card was updated after every change.

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