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The previous example is doing the same initialization work as shown in the other example: It disables the close function for the WebPart that contains the calendar MyCalendar and then specifies a help page for the calendar that can be displayed in a modeless pop-up browser window Figure 30-8 shows the result of these modifications Take a close look at the menu displayed for the WebPart Because you have initialized the HelpUrl, it now displays an additional Help menu entry On the other hand, because you have set the AllowClose property to False, it doesn t contain a Close menu entry anymore..

The ScrollBar type uses a double to represent the value of the thumb, rather than an expected whole number (e.g., an integer). Therefore, as you drag the thumb, you will find various floating-point numbers displayed within the Label (e.g., 61.0576923076923). The end user would find this rather unintuitive because he is most likely expecting to see whole numbers (e.g., 61, 62, and 63). If you wish to convert the value of a data-binding operation into an alternative format, you could create a custom class that implements the IValueConverter interface of the System.Windows.Data namespace. This interface defines two members that allow you to perform the conversion to and from the target and destination (in the case of a two-way data binding). Once you define this class, you can use it to qualify further the processing of your data-binding operation. Assuming that you wish to display whole numbers within the Label control, you can build the following class using Expression Blend. Activate the Project Add New Item menu and insert a class named MyDoubleConverter. Next, add the following: class MyDoubleConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { // Convert the double to an int. double v = (double)value; return (int)v; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {

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// You won't worry about "two way" bindings // here, so just return the value. return value; } } The Convert() method is called when the value is transferred from the source (the ScrollBar) to the destination (the Text property of the TextBox). You receive many of incoming arguments, but you only need to manipulate the incoming object for this conversion, which is the value of the current double. You can use this type to cast the type into an integer and return the new number. The ConvertBack() method will be called when the value is passed from the destination to the source (if you have enabled a two-way binding mode). Here, you simply return the value straightaway. Doing so lets you type a floating-point value into the TextBox (e.g., 99.9) and have it automatically convert to a whole number value (e.g., 99) when the user tabs off the control. This free conversion happens due to the fact that the Convert() method is called again, after a call to ConvertBack(). If you were simply to return null from ConvertBack(), your binding would appear to be out of sync because the text box would still be displaying a floating-point number!

Until now you have accessed WebParts from the outside only. But when creating a user control that will be used as a WebPart on a WebPart page, you can access properties of the WebPart from inside the user control as well. To a certain degree, you can control the WebPart s appearance and behavior in a more detailed manner by implementing the IWebPart interface. The IWebPart interface defines a contract between your control (a server control or user control), which is used by the GenericWebPart wrapper class to communicate with your control for specific things such as automatically retrieving a control s title so that you don t need to set it from outside every page where you are going to use this WebPart. Table 30-3 lists the members you have to provide in your WebPart when implementing the IWebPart interface. Table 30-3. The Members of the IWebPart Interface

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