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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(); }

public void RefreshTime() { lnkTime.Text = DateTime.Now.ToLongTimeString(); } } Note that in this example, the user control receives and handles a Page.Load event. This event and event handler are completely separate from the Page.Load event that the web form can respond to (although they both are raised as a consequence of the same thing a page being created). This makes it easy for you to add initialization code to a user control.

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Currently, the TimeDisplay user control allows only limited interaction with the page that hosts it. All you can really do in your web-form code is call RefreshTime() to update the display. To make a user control more flexible and much more reusable, developers often add properties. The next example shows a revised TimeDisplay control that adds a public Format property. This property accepts a standard .NET format string, which configures the format of the displayed date. The RefreshTime() method has been updated to take this information into account. public class TimeDisplay : System.Web.UI.UserControl { protected void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) RefreshTime(); } private string format; public string Format { get { return format; } set { format = value; } } protected void lnkTime_Click(object sender, System.EventArgs e) { RefreshTime(); } public void RefreshTime() { if (format == "") { lnkTime.Text = DateTime.Now.ToLongTimeString(); } else { // This will throw an exception for invalid format strings, // which is acceptable. lnkTime.Text = DateTime.Now.ToString(format); } } }

Now, all that s necessary is to set up a URL configuration that provides both a form class and a template name. This decorator will handle the rest, only calling the view when the form has been completed and submitted for processing.

In the hosting page, you have two choices. You can set the Format property at some point in your code by manipulating the control object, as shown here: TimeDisplay1.Format = "dddd, dd MMMM yyyy HH:mm:ss tt (GMT z)"; Your second option is to configure the user control when it s first initialized by setting the value in the control tag, as shown here: <apress:TimeDisplay id="TimeDisplay1" Format="dddd, dd MMMM yyyy HH:mm:ss tt (GMT z)" runat="server" /> <hr /> <apress:TimeDisplay id="TimeDisplay2" runat="server" /> In this example, two versions of the TimeDisplay control are created, one with a control that displays the date in the default format and another one with a custom format applied. Figure 14-3 shows the resulting page on the browser.

If you use simple property types such as int, DateTime, float, and so on, you can still set them with string values when declaring the control on the host page. ASP.NET will automatically convert the string to the property type defined in the class. Technically, ASP.NET employs a type converter a special type of object often used to convert data types to and from string representations, which is described in 28.

When you begin adding properties to a user control, it becomes more important to understand the sequence of events. Essentially, page initialization follows this order: 1. The page is requested. 2. The user control is created. If you have any default values for your variables, or if you perform any initialization in a class constructor, it s applied now. 3. If any properties are set in the user control tag, these are applied now. 4. The Page.Load event in the page executes, potentially initializing the user control. 5. The Page.Load event in the user control executes, potentially initializing the user control. Once you understand this sequence, you ll realize that you shouldn t perform user control initialization in the Page.Load event of the user control that might overwrite the settings specified by the client.

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