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// Write the message. // A using block ensures the file is automatically closed, // even in the case of error. string fileName = (string)ViewState["LogFile"]; using (FileStream fs = new FileStream(fileName, mode)) { StreamWriter w = new StreamWriter(fs); w.WriteLine(DateTime.Now); w.WriteLine(message); w.Close(); } } For example, a log message is added every time the page is loaded, as shown here: protected void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) { Log("Page loaded for the first time."); } else { Log("Page posted back."); } } The last ingredients are two button event handlers that allow you to delete the log file or show its contents, as follows: protected void cmdRead_Click(object sender, System.EventArgs e) { if (ViewState["LogFile"] != null) { string fileName = (string)ViewState["LogFile"]; using (FileStream fs = new FileStream(fileName, FileMode.Open)) { StreamReader r = new StreamReader(fs); // Read line by line (allows you to add // line breaks to the web page). string line; do { line = r.ReadLine(); if (line != null) { lblInfo.Text += line + "<br>"; } } while (line != null); r.Close(); } } } protected void cmdDelete_Click(object sender, System.EventArgs e) {

} else if (ctrl is PlaceHolder) { ph = (PlaceHolder)ctrl; } else if (ctrl is Label) { lbl = (Label)ctrl; } } // Load the dynamic content into this panel. string ctrlName = list.SelectedItem.Value; if (ctrlName.EndsWith(".ascx")) { ph.Controls.Add(Page.LoadControl(ctrlName)); } lbl.Text = "Loaded..." + ctrlName; } Figure 14-8 shows this example in action.

For a Visual Studio shortcut, select the underlying page (so that the DOCUMENT object appears in the Properties window), and then set the StyleSheet property to the stylesheet filename. This adds the <link> tag automatically. You can also drag the stylesheet onto the design surface of a page to trigger the same outcome.

if (ViewState["LogFile"] != null) { File.Delete((string)ViewState["LogFile"]); } } Figure 13-4 shows the web page displaying the log contents.

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Figure 14-8. A dynamic web page with multiple user controls Using this technique to build an entire web portal framework is possible, but it requires significant work before it would be practical. Creating this framework is a tedious, time-consuming task. In 31 you ll learn about a web parts, a native ASP .NET solution for building web portals that doesn t force you to reinvent the wheel. Web parts are based, at least in part, on user controls.

Now you can bind any static HTML element or control to your style rules. For example, if you want an ordinary label to use the heading1 format, set the Label.vbsStyle property to heading1, as shown here: <asp:Label ID="Label1" runat="server" Text="This Label Uses heading1" CssClass="heading1"></asp:Label> You ll immediately see the result of the new formatting in the design window. Figure 15-1 shows a page that uses several CSS styles.

Of course, in some cases you do need to update the same file in response to actions taken by multiple users. One approach is to use locking. The basic technique is to create a separate class that performs all the work of retrieving the data. Once you ve defined this class, you can create a single global instance of it and add it to the Application collection. Now you can use the C# lock statement to ensure that only one thread can access this object at a time (and hence only one thread can attempt to open the file at once). For example, imagine you create the following Logger class, which updates a file with log information when you call the LogMessage() method, as shown here: public class Logger { public void LogMessage() { lock (this) { // (Open the file and update it.) } } }

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