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<hr> <%# GetVersionInfoString(DataBinder.Eval(Container.DataItem, "FullName")) %> </ItemTemplate> </asp:DataList> The data binding expressions are fairly straightforward. The only one that needs any expression is the GetVersionInfoString() method. This method is coded inside the page class. It creates a new FileVersionInfo object for the file and uses that to extract the version information and product name. protected string GetVersionInfoString(object path) { FileVersionInfo info = FileVersionInfo.GetVersionInfo((string)path); return info.FileName + " " + info.FileVersion + "<br>" + info.ProductName + " " + info.ProductVersion; } Of course, most developers have FTP tools and other utilities that make it easier to manage files on a web server. However, this page provides an excellent example of how to use the .NET file and directory management classes. With a little more work, you could transform it into a fullfeatured administrative tool for a web application.

Once it s configured, the web-page code never needs to interact with this control again. When the user clicks one of the links, the user is just forwarded to the new destination without needing any additional code. Another approach would be to design the LinkTable so that it raises a serverside click event. You ll see that approach in the next section.

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To create a user control in Visual Studio, select Website Add New Item, and choose the Web User Control template. The following is the simplest possible user control one that merely contains static HTML. This user control represents a header bar. <%@ Control Language="C#" AutoEventWireup="true" CodeFile="Header.ascx.cs" Inherits="Header" %> <table width="100%" border="0" bgcolor="blue"> <tr> <td><font face="Verdana,Arial" size="6" color="yellow"><b> User Control Test Page</b></font> </td> </tr> <tr> <td align="right"><font size="3" color="white"><b> An Apress Creation 2004</b></font>    </td> </tr> </table> You ll notice that the Control directive identifies the code-behind class. However, the simple header control doesn t require any custom code to work, so you can leave the class empty: public partial class Header : System.Web.UI.UserControl {} As with ASP.NET web forms, the user control is a partial class, because it s merged with a separate portion generated by ASP.NET. That automatically generated portion has the member variables for all the controls you add at design time. Now to test the control, you need to place it on a web form. First, you need to tell the ASP.NET page that you plan to use that user control with the Register directive, as shown here: <%@ Register TagPrefix="apress" TagName="Header" Src="Header.ascx" %>

The .NET Framework uses a stream model in several areas of the framework. Streams are abstractions that allow you to treat different data sources in a similar way as a stream of ordered bytes. All .NET stream classes derive from the base System.IO.Stream class. Streams represent data in a memory buffer, data that s being retrieved over a network connection, and data that s being retrieved from or written to a file. Here s how you create a new file and write an array of bytes to it through a FileStream: FileStream fileStream = null; try { fileStream = new FileStream(fileName, FileMode.Create); fileStream.Write(bytes); } finally { if (fileStream != null) fileStream.Close(); } In this example, the FileMode.Create value is specified in the FileStream constructor to indicate that you want to create a new file. You can use any of the FileMode values described in Table 13-10. Table 13-10. Values of the FileMode Enumeration

Another way that communication can occur between a user control and a web page is through events. With methods and properties, the user control reacts to a change made by the web-page code. With events, the story is reversed the user control notifies the web page about an action, and the web-page code responds. Usually, you ll delve into events when you create a user control that the user can interact with. After the user takes a certain action such as clicking a button or choosing an option from a list your user control intercepts a web control event and then raises a new, higher-level event to notify your web page. The first version of LinkTable control is fairly functional, but it doesn t use events. Instead, it simply creates the requested links. To demonstrate how events can be used, the next example revises the LinkTable so that it notifies the user when an item is clicked. Your web page can then determine what action to take based on which item was clicked.

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