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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 Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) LoadControls(div1) LoadControls(div2) LoadControls(div3) End Sub Private Dim Dim Dim Sub LoadControls(ByVal container As Control) list As DropDownList = Nothing ph As PlaceHolder = Nothing lbl As Label = Nothing

When you add a new web page to your website (using Website Add New Item), the Place Code in a Separate File check box chooses whether you want to use the code-behind model (see Figure 2-21) Visual Studio remembers your previous setting for the next time you add a new page, but it s completely valid (albeit potentially confusing) to mix both styles of pages in the same application..

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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You can represent a string in binary form using more than one way, depending on the encoding you use. The most common encodings include the following: ASCII: Encodes each character in a string using 7 bits. ASCII-encoded data can t contain extended Unicode characters. When using ASCII encoding in .NET, the bits will be padded, and the resulting byte array will have 1 byte for each character. Full Unicode (or UTF-16): Represents each character in a string using 16 bits. The resulting byte array will have 2 bytes for each character. UTF-7 Unicode: Uses 7 bits for ordinary ASCII characters and multiple 7-bit pairs for extended characters. This encoding is primarily for use with 7-bit protocols such as mail, and it isn t regularly used. UTF-8 Unicode: Uses 8 bits for ordinary ASCII characters and multiple 8-bit pairs for extended characters. The resulting byte array will have 1 byte for each character (provided there are no extended characters). .NET provides a class for each type of encoding in the System.Text namespace. When using the StreamReader and StreamWriter, you can specify the encoding you want to use with a constructor argument, or you can simply use the default UTF-8 encoding. Here s an example that creates a StreamWriter that uses ASCII encoding: FileStream fileStream = new FileStream(@"c:\myfile.txt", FileMode.Create); StreamWriter w = new StreamWriter(fileStream, System.Text.Encoding.ASCII);

' Find the controls for this panel. For Each ctrl As Control In container.Controls If TypeOf ctrl Is DropDownList Then list = CType(ctrl, DropDownList) Else If TypeOf ctrl Is PlaceHolder Then ph = CType(ctrl, PlaceHolder) Else If TypeOf ctrl Is Label Then lbl = CType(ctrl, Label) End If Next ' Load the dynamic content into this panel. Dim ctrlName As String = list.SelectedItem.Value If ctrlName.EndsWith(".ascx") Then ph.Controls.Add(Page.LoadControl(ctrlName)) End If lbl.Text = "Loaded..." & ctrlName End Sub Figure 14-8 shows this example in action.

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); } } }

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