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Here s the code that loads the selected control: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) ' Remember that the control must be loaded in the Page.Load event handler. ' The DropDownList.SelectedIndexChanged event fires too late. Dim ctrlName As String = listControls.SelectedItem.Value If ctrlName.EndsWith(".ascx") Then placeHolder.Controls.Add(Page.LoadControl(ctrlName)) End If lbl.Text = "Loaded..." & ctrlName End Sub This example demonstrates a number of interesting features. First, because the PlaceHolder is stored in a formatted container, the user controls you load automatically acquire the container s font, background color, and so on (unless they explicitly define their own fonts and colors). Best of all, because you re loading these controls when the Page.Load event fires, the control objects are able to handle their own events. You can try this by loading the TimeDisplay user control and then clicking the link to refresh the time.

So far, you ve learned how to design simple web pages, and you ve taken a tour of the Visual Studio interface But before you get to serious coding, it s important to understand a little more about the underpinnings of the ASPNET code model In this section, you ll learn about your options for using code to program a web page and how ASPNET events wire up to your code Visual Studio supports two models for coding web pages and web services: Inline code: This model is the closest to traditional ASP All the code and HTML is stored in a single aspx file The code is embedded in one or more script blocks However, even though the code is in a script block, it doesn t lose IntelliSense or debugging support, and it doesn t need to be executed linearly (like classic ASP code).

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{ if (!Page.IsPostBack) RefreshTime(); } protected void lnkTime_Click (object sender, EventArgs e) { RefreshTime(); } public void RefreshTime() { lnkTime.Text = DateTime.Now.ToLongTimeString(); } </script> Note that the lnkTime_Click event handler calls a method named RefreshTime(). Because this method is public, the code on the hosting web form can trigger a label refresh programmatically by calling the method at any time. Another important detail is the ClassName attribute in the Control directive. This indicates that the code will be compiled into a user control named TimeDisplay, with the methods in the script block. Figure 14-2 shows the resulting control.

Because the TimeDisplay control isn t loaded until the page is posted back at least once, it won t show the time until you click the link at least once. Instead, it will start with the generic control name text. You can solve this problem in a number of ways, including calling the RefreshTime() method from your web page when the control is loaded. An even better approach is to create an interface for all your user controls that defines certain basic methods, such as InitializeControl(). That way, you can initialize any control generically. Most portal frameworks use interfaces to provide this type of standardization.

Instead, you ll still react to control events and use subroutines This model is handy because it keeps everything in one neat package, and it s popular for coding simple web pages Code-behind: This model separates each ASPNET web page into two files: an aspx markup file with the HTML and control tags, and a cs code file with the source code for the page This model provides better organization, and separating the user interface from programmatic logic is keenly important when building complex pages In Visual Studio 2005, the implementation of the code-behind model has changed, but the overall philosophy is the same In NET 10 and 11, the design tool you choose determines the model you use With Visual Studio, you have the freedom to use both approaches.

Figure 14-2. A user control that handles its own events The code takes a turn for the better if you split it into a separate .ascx portion and a .cs codebehind file. In this case, the Control directive must specify the Src attribute with the name of the user control source code file or the Inherits attribute with the name of the compiled class. User controls created always use the Inherits attribute, as shown here: <%@ Control Language="c#" AutoEventWireup="true" CodeFile="TimeDisplay.ascx.cs" Inherits="TimeDisplay" %> <asp:LinkButton id="lnkTime" runat="server" OnClick="lnkTime_Click" /> And here s the corresponding code-behind class: public partial class TimeDisplay : System.Web.UI.UserControl { protected void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) RefreshTime(); } protected void lnkTime_Click(object sender, System.EventArgs e) { RefreshTime(); }

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