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UpDown is a composite server control that declares private controls of type TextBox to render an <INPUT type="text"> tag and two Button controls to render <INPUT type="button"> tags. It adds these controls by overriding the CreateChildControls method from WebControl, and it wires up their events to the parent control s events. Because our control will emit JavaScript that needs to know the fully qualified name of each child control in order to work properly on the client, we implement the INamingContainer interface to ensure generation of unique names and use the UniqueID property from each of our private control declarations. In the following code, we access the UniqueID of the valueTextBox that holds the value of the UpDown control: scriptInvoke = DOWN_FUNC + "('" + valueTextBox.UniqueID Now that we have presented an overview of how the control is constructed, we can jump into a discussion in the next section of how the control renders itself to support client-side and server-side event integration.

Sets the appearance of the overall box in which all the menu items appear. In the case of StaticMenuStyle, this box is shown on the page, whereas with Dynamic-MenuStyle it s shown as a pop-up. Sets the appearance of individual menu items. Sets the appearance of the selected item. Note that the selected item isn t the item that s currently being hovered over. It s the item that was previously clicked (and triggered the last postback). Sets the appearance of the item that the user is hovering over with the mouse.

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Along with these styles, you can set level-specific styles so that each level of menu and submenu is different. You do this using three collections: LevelMenuItemStyles, LevelSubMenuStyles, LevelSelectedStyles. These collections apply to ordinary menus, menus that contain other items, and selected menu items, respectively. It might seem like there s a fair bit of unnecessary work here in separating dynamic and static styles. The reason for this model becomes obvious when you consider another remarkable feature of the Menu control it allows you to choose the number of static levels. By default, there is only one static level, and everything else is displayed as a fly-out menu when the user hovers over the corresponding parent. But you can set the Menu.StaticDisplayLevels property to change all that. If you set it to 2, for example, the first two levels of the menu will be rendered in the page, using the static styles. (You can control the indentation of each level using the StaticSubMenuIndent property.) Figure 16-20 shows the previous example with this change. Note that the items still change as you hover over them, and selection works in the same way. If you want, you can make your entire menu static.

As you work through this chapter, you ll see a number of references to Web Part connections Web Part connections allow Web Parts to communicate important information with one another You may find this useful when you want one Web Part to change in response to an action on another Web Part For example, let s say you have a Web Part that allows you to select an employee from a list and a Web Part that displays an employee s photo You can create a connection between the two and pass the selected employee information from the selector Web Part into the photo Web Part so the photo display changes in response to the currently selected employee By default, a Web Part is a standalone component that does not support connections.

Figure 3-8. LabelControls.aspx after the first request Listing 3-5. The LabelControls Web Form .aspx Page File <%@ Page Language="C#" MasterPageFile="~/MasterPage/ControlsBook2MasterPage.Master" AutoEventWireup="true" CodeBehind="LabelControls.aspx.cs" Inherits="ControlsBook2Web.Ch03.LabelControls" Title="Label Controls Demo" %> <%@ Register TagPrefix="apress" Namespace="ControlsBook2Lib.Ch03" Assembly="ControlsBook2Lib" %> <asp:Content ID="Content1" ContentPlaceHolderID="NumAndTitle" runat="server"> <asp:Label ID="NumberLabel" runat="server" Width="14px">3</asp:Label>  <asp:Label ID="TitleLabel" runat="server" Width="360px"> ASP.NET State Management</asp:Label> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="PrimaryContent" runat="server"> <h3> Label Controls</h3> Enter your name:

The Menu control exposes many more top-level properties for tweaking specific rendering aspects. For example, you can set the delay before a pop-up menu disappears (DisappearAfter), the default images used for expansion icons and separators, the scrolling behavior (which kicks into gear when the browser window is too small to fit a pop-up menu), and much more. Consult MSDN for a full list of properties.

The Menu control also supports templates through the StaticMenuItemTemplate and DynamicMenuItemTemplate properties. These templates determine the HTML that s rendered for each menu item, giving you complete control.

If you plan on connecting two Web Parts, then you have to create a custom message interface that defines the data passed along the connection, a Provider Web Part that supplies that data, and a Consumer Web Part that uses the data to accomplish some task And that only allows the Web Parts to support connections; it does not actually create a connection A Web Part connection defines the relationship between a Provider Web Part and a Consumer Web Part on a page In essence, a Web Part connection tells the Web Part Framework to acquire the custom message object from the Provider Web Part and send it to the Consumer Web Part where it can be used to accomplish some task.

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