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<asp:Content ID="Content2" ContentPlaceHolderID="PrimaryContent" runat="server"> <h3> HTML Controls</h3> X <input type="text" id="XTextBox" runat="server" /><br /> <br /> Y <input type="text" id="YTextBox" runat="server" /><br /> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <input type="submit" id="BuildTableButton" runat="server" value= "Build Table" onserverclick="BuildTableButton_ServerClick" /> <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1"> <ProgressTemplate> Updating...</ProgressTemplate> </asp:UpdateProgress> <span id="Span1" runat="server"></span> </ContentTemplate> </asp:UpdatePanel> </asp:Content> Listing 2-22. The TextBox3dDemo Code-Behind Class File using using using using using System; System.Web; System.Web.UI; System.Web.UI.WebControls; System.Web.UI.HtmlControls;

You can alter the security context for an ASP.NET applications or individual users by implementing impersonation. A general overview of impersonation and delegation are given next, and configuring impersonation and delegation are discussed later in the chapter.

To make it even easier to create a new content page, let Visual Studio guide you. Just select Website Add Tip New Item from the menu. Select Web Form, click the Select Master Page File check box, and click OK. Visual Studio will prompt you to choose a master page file from your current web project. When you take this step, Visual Studio automatically creates a Content control for every ContentPlaceHolder in the master page.

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Thus, to create a complete content page that uses the SiteTemplate master page, you simply need to fill in the content for the ContentPlaceHolder with the ID ContentPlaceHolder1. Here s an example that shows the complete page code: <%@ Page Language="C#" MasterPageFile="~/SiteTemplate.master" AutoEventWireup="true" CodeFile="SimpleContentPage.aspx.cs" Inherits="SimpleContentPage_aspx" Title="Untitled Page" %> <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server"> <span style="...">Far out in the uncharted backwaters of the unfashionable end of the western spiral arm of the Galaxy lies a small unregarded yellow sun.</span> </asp:Content> As you can see, content pages are refreshingly clean, because they don t include any of the details defined in the master page. Even better, this makes it easy to update your website. All you need to is modify a single master page. As long as you keep the same ContentPlaceHolder controls, the existing content pages will keep working and will fit themselves into the new layout wherever you specify. Figure 15-11 shows this sample content page.

namespace ControlsBook2Web.Ch02 { public partial class HtmlControlsAJAX : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void BuildTableButton_ServerClick(object sender, EventArgs e) { int xDim = Convert.ToInt32(XTextBox.Value); int yDim = Convert.ToInt32(YTextBox.Value); BuildTable(xDim, yDim); }

Impersonation allows you to run a process or thread using the security context of a different account instead of inheriting the security context from the current process or thread. This can be very useful in ASP.NET because ASP.NET normally runs under the least privileged ASPNET account in IIS 5 and Network Service in IIS 6, which has limited access to system resources.

To get a better understanding of how master pages work under the hood, it s worth taking a look at a content page with tracing (add the Trace="True" attribute in the Page directive). That way you can study the control hierarchy. What you ll discover is that ASP .NET creates the control objects for the master page first, including the ContentPlaceHolder, which acts as a container. It then adds the controls from the content page into the ContentPlaceHolder.

Visual Studio has always provided robust tools for debugging your web applications. In Visual Studio 2005, these tools remain essentially the same, with some minor enhancements that make it easier to drill into live objects and collections at runtime. To debug a specific web page in Visual Studio, select that web page in the Solution Explorer, and click the Start Debugging button on the toolbar. (If you are currently editing the web page you want to test, you don t need to select it at all just click Start Debugging to launch it directly.) What happens next depends on the location of your project. If your project is stored on a remote web server or a local IIS virtual directory, Visual Studio simply launches your default browser and directs you to the appropriate URL. If you ve used a file system application, Visual Studio starts its integrated web server on a dynamically selected port (which prevents it from conflicting with IIS, if it s installed). Then Visual Studio launches the default browser and passes it a URL that points to the local web server. Either way, the real work compiling the page and creating the page objects is passed along to the ASP.NET worker process.

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