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You can walk over the structure of a Menu control in much the same way as the structure of a TreeView. The Menu contains a collection of MenuItem objects in the Items property, and each MenuItem has a ChildItems collection that contains nested items. For example, you could adapt the previous example that used the TreeView to display a list of categories and products by simply changing a few class names. Here s the code you need, with the surprisingly few changes highlighted: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { DataSet ds = GetProductsAndCategories(); // Loop through the category records. foreach (DataRow row in ds.Tables["Categories"].Rows) { // Use the constructor that requires just text // and a nondisplayed value. MenuItem itemCategory = new MenuItem( row["CategoryName"].ToString(), row["CategoryID"].ToString()); Menu1.Items.Add(itemCategory); // Get the children (products) for this parent (category). DataRow[] childRows = row.GetChildRows(ds.Relations[0]); // Loop through all the products in this category. foreach (DataRow childRow in childRows) { MenuItem itemProduct = new MenuItem( childRow["ProductName"].ToString(), childRow["ProductID"].ToString()); itemCategory.ChildItems.Add(itemProduct); } } } } protected void Menu1_MenuItemClick(object sender, System.Web.UI.WebControls.MenuEventArgs e) { if (Menu1.SelectedItem.Depth == 0) { lblInfo.Text = "You selected Category ID: "; } else if (Menu1.SelectedItem.Depth == 1) { lblInfo.Text = "You selected Product ID: "; } lblInfo.Text += Menu1.SelectedItem.Value; } Figure 16-19 shows the result.

Take a good look at it to get an idea of the basic Web Part layout..

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Figure 16-19. Displaying a menu with information from a database Overall, the Menu and TreeView controls expose strikingly similar programming models, even though they render themselves quite differently. They also have a similar style-based formatting model. But a few noteworthy differences exist: The Menu displays a single submenu. The TreeView can expand an arbitrary number of node branches at a time. The Menu displays a root level of links in the page. All other items are displayed using fly-out menus that appear over any other content on the page. The TreeView shows all its items inline in the page. TreeView supports on-demand filling and client callbacks. The Menu does not. The Menu supports templates. The TreeView does not. The TreeView supports check boxes for any node. The Menu does not. The Menu supports horizontal and vertical layouts, depending on the Orientation property. The TreeView supports only vertical layout.

The Menu control provides an overwhelming number of styles. Like the TreeView, the Menu derives a custom class from the Style base class in fact, it derives two (MenuStyle and MenuItemStyle). These styles add spacing properties (ItemSpacing, HorizontalPadding, and VerticalPadding). However, you can t set menu item images through the style, because there is no ImageUrl property. Much like the TreeView, the Menu supports defining different menu styles for different menu levels. However, the key distinction that the Menu control encourages you to adopt is between static items (the root level items that are displayed in the page when it s first generated) and dynamic items (the items in fly-out menus that are added when the user moves the mouse over a portion of the menu). In most websites, there is a definite difference in the styling of these two elements. To support this, the Menu class defines two parallel sets of styles, one that applies to static items and one that applies to dynamic items, as shown in Table 16-13.

Note In the same manner that you have classes and instances, you have Web Parts and Web Part instances. What you, as the developer, create is the actual Web Part itself. Users are interacting with Web Part instances when they add, reposition, edit, or delete Web Parts.

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