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If hand-writing CSS rules seems like too much work, don t worry Visual Studio allows you to build a style rule using the same designer you use to format HTML tags. To use this feature, start by adding your rule declaration. Then, right-click between the two curly braces, and select Build Style. You ll see the familiar Style Builder dialog box where you can point and click your way to custom fonts, borders, backgrounds, and alignment.

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.

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A GUID is a 128-bit integer. GUID values are tremendously useful in programming because they re statistically unique. In other words, you can create GUID values continuously with little chance of ever creating a duplicate. For that reason, GUIDs are commonly used to uniquely identify queued tasks, user sessions, and other dynamic information. They also have the advantage over sequential numbers in that they can t easily be guessed. The only disadvantage is that GUIDs are long and almost impossible to remember (for an ordinary human being). GUIDs are commonly represented in strings as a series of lowercase hexadecimal digits, like 382c74c3-721d4f34-80e5-57657b6cbc27.

A typical stylesheet defines a slew of rules. In fact, stylesheets are often used to formally define the formatting for every significant piece of a website s user interface. The following stylesheet serves this purpose. It defines three rules (heading1, heading2, and blockText) and a body rule that is applied to all tags automatically as a baseline for formatting. body { font-family: Verdana, Arial, Sans-Serif; font-size: small; } .heading1 { font-weight: bold; font-size: large; color: limegreen; } .heading2 { font-weight: bold; font-size: medium; font-style: italic; color: darkkhaki; }

Using the GetFileName() method, you can create a safer logging application that writes information about the user s actions to a text file. In this example, all the logging is performed by calling a Log() method, which then checks for the filename and assigns a new one if the file hasn t been created yet. The text message is then added to the file, along with the date and time information. private void Log(string message) { // Check for the file. FileMode mode; if (ViewState["LogFile"] == null) { // First, create a unique user-specific filename. ViewState["LogFile"] = GetFileName(); // The log file must be created. mode = FileMode.Create; } else { // Add to the existing file. mode = FileMode.Append; }

It s not too difficult to extend this example to provide an entire configurable web page. All you need to do is create more panels and organize them on your web page (possibly using tables and other panels to group them). This might seem like a tedious task, but you can actually use it quite effectively by writing some generic code that deals with all the panels on your page. One option is to create a user control that loads other user controls. Another approach is a custom method, as shown here, which handles user control loading for three panels: protected void Page_Load(object sender, System.EventArgs e) { LoadControls(div1); LoadControls(div2); LoadControls(div3); } private void LoadControls(Control container) { DropDownList list = null; PlaceHolder ph = null; Label lbl = null; // Find the controls for this panel. foreach (Control ctrl in container.Controls) { if (ctrl is DropDownList) { list = (DropDownList)ctrl;

.blockText { padding: 10px; background-color: lightyellow; border-style: solid; border-width: thin; } To use a rule in a web page, you first need to link the page to the appropriate stylesheet. You do this by adding a <link> tag in the <head> section of your page. The link tag references the file with the styles you want to use. Here s an example that allows the page to use styles defined in the file StyleSheet.vbs, assuming it s in the same folder as the web page: <link href="StyleSheet.vbs" rel="stylesheet" type="text/css" />

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