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Add a WebPartManager: Next, you need to add a WebPartManager control to your page This is an invisible control that knows about all the available WebParts on a page and manages personalization The WebPartManager needs to be the first control created on a WebPart page, because every other WebPart-related control depends on it 3 Add WebPartZones: Every section on the page that should display your custom WebParts is encapsulated in an instance of the WebPartZone Add a WebPartZone on every section of your page that should contain WebParts and should be customizable 4 Add WebParts: You can use simple user controls, prebuilt user controls, custom server controls, or controls directly inherited from WebPart You can place all these controls into a WebPartZone using the Visual Studio designer or using the code The ASPNET infrastructure does the rest automatically 5.

looks like an erasure). Finally, enter Select mode and select some strokes by using the mouse as a lasso. After you circle the item, you can move it around the canvas and resize its dimensions. Figure 28-38 shows your edit modes at work.

Add prebuilt zones and parts: If the user wants to add or remove WebParts at runtime or edit properties of WebParts, you need to add prebuilt zones to your web page, such as the CatalogZone (which allows the user to add WebParts to the page)..

Figure 28-38. The InkCanvas in action, with edit modes!

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After you have completed these steps, your WebPart page is ready to use. Remember that you need to include authentication (either Windows or forms authentication) to your application so that the framework can store personalized information on a per-user basis. By default this information is stored in the SQL Server 2005 file-based database ASPNETDB.MDF, which is automatically created in the App_Data directory if you have SQL Server 2005 installed. Otherwise, you need to create the database on SQL Server using aspnet_regsql.exe, as described in 21 (personalization information is stored in the same database as user information). Of course, as is the case with any other part of the framework, and as you have learned for the membership and roles APIs, your custom provider can replace the personalization infrastructure without affecting the application.

Layout containers are classes you use to position the child components in your applications. Flex provides the following layout containers: Canvas the only container that doesn t automatically lay out its children; you have to use x and y coordinates or anchors to position child components;

Once you populate a ComboBox control (or a ListBox), you have three ways to determine the selected item. First, if you wish to find the numerical index of the item selected, you can use the SelectedIndex property (which is zero-based; a value of -1 represents no selection). Second, if you wish to obtain the object within the list that has been selected, the SelectedItem property fits the bill. Third, the SelectedValue allows you to obtain the value of the selected object (typically obtained using a call to ToString()). You need to add the last bit of code for this tab to change the color of the strokes entered on the InkCanvas. The DefaultDrawingAttributes property of InkCanvas returns a DrawingAttributes object that allows you to configure numerous aspect of the pen nib, including its size and color (among other settings). Update your C# code with this implementation of the ColorChanged() method: private void ColorChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e) { // Get the selected value in the combo box. string colorToUse = (this.comboColors.SelectedItem as ComboBoxItem).Content.ToString(); // Change the color used to render the strokes. this.myInkCanvas.DefaultDrawingAttributes.Color = (Color)ColorConverter.ConvertFromString(colorToUse); }

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