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Chapter 17: ASP.NET Ajax 425Figure 17-2 Ajax-enabled web sitequickly the text appears. Now load up and test the non-Ajax version, Old School, andcompare the two. The difference is that only the text was posted back in the Ajax version,not the whole page.When you run examples of your local host, they do not go through the routers andother time-consuming gates that typically happen in production use. As a result, theAsk the ExpertQ: In the Ajax example, no event handling code was entered for the button. How is itpossible for the button to keep passing the contents of the TextBox control to theLabel control using the Page_Load event handler?A: When the button is pressed, it generates a post-back. The page thinks that with the useof the default Load_Page, a new page is loaded, so it passes the values of the TextBoxcontrol to the Label control. By and large, that is not a recommended practice. See thesection “Using Events with Ajax” later in this chapter.
426ASP.NET 3.5: A Beginner’s Guidesavings you see with Ajax are actually underestimated because their real value lies in thefact that fewer materials are sent over the Internet. However, even on your local computer,you can see the difference Ajax makes.Ajax Timer ControlThe Timer control in the Toolbox’s Ajax Extensions menu is very useful. Essentially,the Timer control is one that calls a C# function in timed intervals. This is a perfectapplication for bringing in information based on a timer but not reloading the entire page.Timer PropertiesNot only is the Ajax Timer control useful, but it also is easy to use. With only fourproperties, ID, Enabled, EnableViewState, and Interval, you can set it upvery quickly. For most applications the only property that really needs setting is theInterval. The Interval value is set in microseconds. So, for example, if you want a22-second interval, you would set the value to 22000.The control has several different events as well, but for most uses, all you need isthe OnTick event. The OnTick event calls a C# event handler (method) at the assignedInterval. By placing the Timer inside the UpdatePanel container, by default it is theAjax event handler for the UpdatePanel. (See “Using Events with Ajax” for elaboration.)To see a practical application of using the Ajax Timer control, this next web site showshow the contents of external text files can be loaded into an Ajax context. Keep in mindthat by loading the text in the Ajax UpdatePanel container, you will ensure that only thetext, not the entire page, will be reloaded.Before building the web site, you will need to understand how C# generates randomnumbers. (They’re actually pseudorandom numbers, and for the purposes of thisapplication, pseudorandom will be fine.) The code for the random-number generator issimple, but very different from some other languages. For generating values within a givenrange, you use the following format:Random random = new Random();randomVar = random.Next(maxNumericValue);For example, if you have 12 different elements in an application, to generate randomvalues from 1 to 12, you would writeRandom random = new Random();randomVar = random.Next(12);In the sample application, the random number is used to select an array element and isplaced as a numeric key to select names of text files to load.
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ASP.NET 3.5A Beginner’s Guide
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ASP.NET 3.5A Beginner’s GuideWill
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This book is dedicated to Ricky, Ol
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Contents at a GlancePART I Getting
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For more information about this tit
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Contents xiUsing HTML Forms Interac
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Contents xiiiCREATE: The SQL Comman
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Contents xv17 ASP.NET Ajax . . . .
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AcknowledgmentsThis book was greatl
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IntroductionWhat distinguishes the
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Introduction xxiWhat This Book Cove
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Introduction xxiiiChapter 7: CSS fo
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Chapter 17: ASP.NET Ajax One of the
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Part IGetting StartedCopyright © 2
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Chapter 1Introduction toASP.NET 3.5
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Chapter 1: Introduction to ASP.NET
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Chapter 4Doing More withC# and ASP.
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Part IIForms and ControlsCopyright
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Chapter 5HTML Forms: A ReviewCopyri
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Part IIIASP.NET and DatabasesCopyri
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Chapter 11A SQL PrimerCopyright ©
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Chapter 11: A SQL Primer 271the dat
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Chapter 11: A SQL Primer 275Specify
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Chapter 11: A SQL Primer 277ASP.NET
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Chapter 12: ADO.NET: Hello Database
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Chapter 13Data BindingCopyright ©
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Chapter 13: Data Binding 331On the
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Chapter 14LINQCopyright © 2009 by
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Chapter 14: LINQ 365As you can see,
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Chapter 14: LINQ 367Basic LINQC# CS
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Chapter 15FilesCopyright © 2009 by
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Chapter 15: Files 373The bulk of th
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Page 472 and 473: Index 445IntelliSense, 27and events
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