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It is possible to have multiple users open the file in read-write mode by specifying a different FileAccess value (such as FileAccess.Write or FileAccess.ReadWrite). In this case, Windows will dynamically lock small portions of the file when you write to them (or you can use the FileStream.Lock() method to lock down a range of bytes in the file). If two users try to write to the same locked portion at once, an exception can occur. Because web applications have high concurrency demands, this technique is not recommended and is extremely difficult to implement properly. It also forces you to use low-level byte-offset calculations, where it is notoriously easy to make small, aggravating errors. So, what is the solution when multiple users need to update a file at once One option is to create separate user-specific files for each request. Another option is to tie the file to some other object and use locking. The following sections explain these techniques.

You can get the technical lowdown on CSS at http://www.w3.org/Style/CSS, or you can visit http://www.w3schools.com/css for a thorough tutorial.

Figure 14-6. A panel for holding user controls When the user selects an item from the drop-down list, the page posts back, and the appropriate user control is loaded dynamically and inserted into the placeholder. Figure 14-7 shows the result.

One solution for dealing with user-concurrency headaches with files is to avoid the conflict altogether by using different files for different users. For example, imagine you want to store a

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With CSS, you use a stylesheet to define a set of formatting presets. You then link this stylesheet to the appropriate control using the CssClass property. To try it and add an (almost) empty stylesheet to your web project, choose Website Add New Item in Visual Studio. Then select Style Sheet, and click OK. Stylesheets consist of rules. Each rule defines how a single ingredient in your web page should be formatted. For example, if you want to define a rule for formatting headings, you start by defining a rule with a descriptive name, like this: .heading1 { } Each rule name has two parts. The portion before the period indicates the tag to which the rule applies. In this example, nothing appears before the period, which means the rule can apply to any tag. The portion after the period is a unique name (called the CSS class name) that you choose to identify your rule. Once you ve defined a rule, you can add the appropriate formatting information. Here s an example that sets the heading1 style to a large sans-serif font with a green foreground color: .heading1 { font-weight: bold; font-size: large; color: limegreen; font-family: Verdana, Arial, Sans-Serif; }

Here s the code that loads the selected control: protected void Page_Load(object sender, System.EventArgs e) { // Remember that the control must be loaded in the Page.Load event handler. // The DropDownList.SelectedIndexChanged event fires too late. string ctrlName = listControls.SelectedItem.Value; if (ctrlName.EndsWith(".ascx")) { placeHolder.Controls.Add(Page.LoadControl(ctrlName)); } lbl.Text = "Loaded..." + ctrlName; } 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.

user-specific log. To prevent the chance for an inadvertent conflict if two web pages try to use the same log, you can use the following two techniques: Create a user-specific directory for each user. Add some information to the filename, such as a timestamp, GUID (global unique identifier), or random number. This reduces the chance of duplicate filenames to a small possibility. The following sample page demonstrates this technique. It defines a method for creating filenames that are statistically guaranteed to be unique. In this case, the filename incorporates a GUID. Here s the private method that generates a new unique filename: private string GetFileName() { // Create a unique filename. string fileName = "user." + Guid.NewGuid().ToString(); // Put the file in the current web application path. return Path.Combine(Request.PhysicalApplicationPath, fileName); }

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