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Old School
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The first web site is made up of three standard web controls: a TextBox, a Button, and a Label When you press the button, the contents of the TextBox are passed to the Label The following listings provide everything you need for this application:
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ASPNET Defaultaspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Defaultaspxcs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <title>Old School Update</title> </head> <body> <h3>Update From the Old School</h3> <form id="form1" runat="server"> <div> <asp:TextBox ID="TextBox1" runat="server" /><p /> <asp:Button ID="Button1" runat="server" Text="Old School" onclick="Button1_Click" /></p> <asp:Label ID="Label1" runat="server" Text="New Info Appears Here" /> </div> </form> </body> </html>
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C# Defaultaspxcs
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using System; public partial class _Default : SystemWebUIPage { protected void Button1_Click(object sender, EventArgs e) { Label1Text = TextBox1Text; } }
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When you test the application, Figure 17-1 shows what you will see What this application does is what ASPNET was originally designed to accomplish have pages that would post back to themselves When you test it, you will notice that on the first test, it takes a while for any message to come back That s because the post-back is sending more than just the message It s old school As you change the text, you can see
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Figure 17-1 Sending a message back to the page
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the delay bumps as everything is hauled back and forth over the Internet (Actually, it s just going to the Visual Studio 2008 server on your machine, so it s not even subject to Internet traffic!)
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Ajax and ASPNET 35
ASPNET 35 Ajax is easy to use and is efficient Using Visual Studio 2008, you can create an Ajax web site using only two Ajax controls The main Ajax control is what is called the UpdatePanel, where all of the elements in your Ajax application can be placed The other control is the ScriptManager The ScriptManager control is required to access the Ajax Library and partial page rendering without post-back
The <ContentTemplate> property contains all of the content of an UpdatePanel control If you drag an UpdatePanel using Visual Studio 2008 into the editor and then add a standard control inside the UpdatePanel from the Design mode, the <ContentTemplate> property is added automatically However, if you do the same thing from the Source mode, no <ContentTemplate> property is added automatically, and you have to add the <ContentTemplate></ ContentTemplate> tags by typing them So, to get started in this next and subsequent examples in this chapter, start off using the Design mode, and once you have placed the Ajax and Standard controls inside the UpdatePanel, you can switch over to the Source mode if you wish
17: ASPNET Ajax
Try This
Upgrading to Ajax
To show how everything works, the first ASPNET Ajax is an exact replica of the Old School example in the previous subsection However, this new one uses Ajax so that you can see the difference in performance between it and the Old School example The following steps show how:
1 Open a new Web Site, and name it AjaxIntro (If you ve used the Ajax plug-in in
ASPNET 20 and are looking for the special Ajax Web form from Visual Studio 2005, you will not find it in Visual Studio 2008 Just select ASPNET Web Site as you would for any new web site)
2 Switch to Design mode, open the Ajax Extensions menu in the Toolbox, and drag an
UpdatePanel control inside the <div> container in the editor
3 Open the Standard menu in the Toolbox and drag TextBox, Button, and Label controls
into the editor Use Figure 17-2 as a guide to where the parts are placed
4 Switch to the Source mode, and right above the <div> tag drag a ScriptManager
control Delete the closing ScriptManager tag, and add a closing /> to the first ScriptManager tag You should see the following:
<asp:ScriptManager ID="ScriptManager1" runat="server" />
The following code listing shows the remaining elements to add to the web site:
ASPNET Defaultaspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Defaultaspxcs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <style type="text/css"> body { background-color:#9cc7f4; color:#930b23; font-family:Verdana; font-size:12px;} btn { background-color:#930b23; color:#e2c7bc; font-size:14px; font-weight:bold;} h2 {color:#930b23;} </style> <title>Easy Ajax</title> </head>
( continued )
ASPNET 35: A Beginner s Guide
<body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <h2>This site has been Ajaxed!</h2> <asp:TextBox ID="TextBox1" runat="server" />  Favorite Web Application Framework<br /> <asp:Button ID="Button1" runat="server" Text="Ajax me!" CssClass="btn" /> <p /> <asp:Label ID="Label1" runat="server" Text="Label" Font-Names="Verdana" Font-Size="12px" Font-Bold="True" /> </ContentTemplate> </asp:UpdatePanel> </div> </form> </body> </html>
You need only make a small change to the C# portion of the application that assigns the value of the TextBox to the Label control Note that the only namespace used is System
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