asp.net barcode s AJAX EXTENSIONS FOR ASP.NET in VB.NET

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CHAPTER 12 s AJAX EXTENSIONS FOR ASP.NET
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Figure 12-2. Welcome screen for ASP .NET AJAX installation
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Clicking Next will begin the installation. You ll see the installation status screen (see Figure 12-3).
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Figure 12-3. Installation status screen
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CHAPTER 12 s AJAX EXTENSIONS FOR ASP.NET
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The installation is pretty straightforward. Once it has installed successfully, you ll see a completion screen (see Figure 12-4).
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Figure 12-4. Completing the installation
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Once this is done, you can launch Visual Studio 2005 and create a new project. In the New Project dialog box, you ll see a new template for ASP .NET AJAX-Enabled Web Application (see Figure 12-5).
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s Note If you are using Visual Studio 2008, the ASP.NET AJAX extensions are already available, and you do
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not need to download them. However, the Control Toolkit is still a separate download.
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Once you ve done this, Visual Studio will create a new ASP.NET Web Application project that is configured to use the ASP.NET extensions. You ll notice a couple of new things. First are the AJAX Extensions controls in the Toolbox (see Figure 12-6). These allow you to provide Ajax functionality in an ASP.NET development environment.
CHAPTER 12 s AJAX EXTENSIONS FOR ASP.NET
Figure 12-5. Creating a new AJAX application
Figure 12-6. AJAX Extensions Server Controls Toolbox
CHAPTER 12 s AJAX EXTENSIONS FOR ASP.NET
In addition, you ll see that the Default.aspx file created by the template will have a ScriptManager on it (see Figure 12-7).
Figure 12-7. Default.aspx with a ScriptManager
Now take a look at the source code for the default page you ll see the following, including the new <asp:ScriptManager> reference:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Example1._Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div> </div> </form> </body> </html>
CHAPTER 12 s AJAX EXTENSIONS FOR ASP.NET
As you can see, this is a pretty straightforward ASP.NET page, with nothing new other than the fact that the ScriptManager control has been added. Now run the page and take a look at the source code that the browser sees. Here s an example:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head><title> Untitled Page </title></head> <body> <form name="form1" method="post" action="Default.aspx" id="form1"> <div> <input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" /> <input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" /> <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKLTY0Mzg3MTY0M2Rk57fizSp0EsJIh1CKh3YgqVTdv10=" /> </div> <script type="text/javascript"> <!-var theForm = document.forms['form1']; if (!theForm) { theForm = document.form1; } function __doPostBack(eventTarget, eventArgument) { if (!theForm.onsubmit || (theForm.onsubmit() != false)) { theForm.__EVENTTARGET.value = eventTarget; theForm.__EVENTARGUMENT.value = eventArgument; theForm.submit(); } } // --> </script>
<script src="/WebResource.axd d= yEDHQ59ZPl_l3mrZolNUQA2&t=632968784944906146" type="text/javascript"></script>
CHAPTER 12 s AJAX EXTENSIONS FOR ASP.NET
<script src="/ScriptResource.axd d= yfwYKTfiMeq0vuB4l8z1TrL35xfv6g8XP_WrOPfTwL66AB2oz 8QRS5Lwfo666oDJgLW4Va2KNp_CEQC1pA2Sjb3Jm9uPm 6XGO-wEIVg6lRA1&t=633062590837065070" type="text/javascript"></script> <script src="/ScriptResource.axd d= yfwYKTfiMeq0vuB4l8z1TrL35xfv6g8XP_WrOPfTwL66AB2oz 8QRS5Lwfo666oDJgLW4Va2KNp_CEQC1pA2SjaH2gXu3ERVLt TRI4HEwCJk1&t=633062590837065070" type="text/javascript"></script> <script type="text/javascript"> //<![CDATA[ Sys.WebForms.PageRequestManager._initialize('ScriptManager1', document.getElementById('form1')); Sys.WebForms.PageRequestManager.getInstance()._updateControls([], [], [], 90); //]]> </script> <div> </div>
<script type="text/javascript"> <!-Sys.Application.initialize(); // --> </script> </form> </body> </html>
There s lots of new stuff here. You ll be seeing how this all hangs together as you work through this book, but for now consider the <script> blocks referencing WebResource.axd and ScriptResource.axd. These guys are downloading the various script libraries that the browser needs for this page. Part of this is to support the core extensions to JavaScript, adding object orientation so that calls like Sys.Application.Initialize() make sense.
CHAPTER 12 s AJAX EXTENSIONS FOR ASP.NET
Migrating ASP.NET to AJAX
One of the nicest things about ASP .NET AJAX is the fact that the UpdatePanel control can be used to add AJAX functionality to an existing ASP.NET application. This is simply achieved by wrapping the relevant controls with an UpdatePanel. Consider the following example. Add a new web form to your application and call it AddWithUpdatePanel.aspx. On this form, add a couple of text boxes, a button, and a label, and call them txtA, txtB, btnAdd, and lblAns, respectively. The source of your page should look like this:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AddWIthUpdatePanel.aspx.cs" Inherits="Example2.AddWIthUpdatePanel" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <asp:TextBox ID="txtA" runat="server"></asp:TextBox><br /> <asp:TextBox ID="txtB" runat="server"></asp:TextBox><br /> <br /> <asp:Button ID="btnAdd" runat="server" OnClick="btnAdd_Click" Text="Add Em Up" /><br /> <asp:Label ID="lblAns" runat="server"></asp:Label><br /> <br />  </div> </form> </body> </html>
Double-click the button to add an event handler, and add the following code to it:
protected void btnAdd_Click(object sender, EventArgs e) { int a = Convert.ToInt16(txtA.Text); int b = Convert.ToInt16(txtB.Text);
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