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The TreeView has a fine-grained style model that lets you completely control its appearance. Each style applies to a type of node. Styles are represented by the TreeNodeStyle class, which derives from the more conventional Style class. As with other rich controls, the styles give you options to set background and foreground colors, fonts, and borders. Additionally, the TreeNodeStyle class adds the node-specific style properties shown in Table 16-10. These properties deal with the node image and the spacing around a node. Table 16-10. TreeNodeStyle Added Properties

As you know, ASP.NET supports Windows, Forms, Passport, and Anonymous (None) Authentication. You learned about the benefits and drawbacks to each earlier on in this chapter, so I ll focus solely on configuration here. (I ll not discuss Passport Authentication because it isn t something most developers will encounter.) Anonymous Authentication Anonymous Authentication is the easiest authentication mechanism to configure because it requires very little ASP.NET configuration and no NTFS configuration. Listing 12-1 shows how it looks in Web.config. Listing 12-1. Configuring Anonymous Authentication in Web.config <configuration> <system.web> <authentication mode="None" /> </system.web> </configuration> You should configure IIS to allow anonymous access when using Anonymous Authentication in ASP.NET if you truly want the access to be anonymous. Otherwise, IIS will force the user to authenticate before handing the request off to ASP.NET for processing, and the user still shows up as anonymous in ASP.NET because none of the authentication modules which load the user information into the context are enabled when the mode is set to None. Windows Authentication Windows Authentication also has a fairly simple ASP.NET configuration, but requires more work configuring NTFS file permissions (see Listing 12-2). Remember, configuring your application to use Windows Authentication also enables the file authorization module, discussed earlier in this chapter, which enforces NTFS file permissions for the authenticated user. ASP.NET uses Windows Authentication by default if no mode is specified in Web.config. Listing 12-2. Configuring Windows Authentication in Web.config <configuration> <system.web> <authentication mode="Windows" /> </system.web> </configuration> You must configure IIS to authenticate the user when your application uses Windows Authentication. Although it s called Windows Authentication in ASP.NET, you re not limited to Integrated Windows Authentication in IIS. You can use Basic and/or Digest Authentication as well.

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The URL for the image shown next to the node The space (in pixels) between the current node and the node above and below The space (in pixels) between the top and bottom of the node text and border around the text The space (in pixels) between the left and right of the node text and border around the text The space (in pixels) between the last child node of an expanded parent node and the following sibling node

To demonstrate integration between client-side programming and server controls along with graceful down-level client rendering, we construct a server control that mimics the NumericUpDown control from the Windows Forms desktop .NET development environment; our control is shown in Figure 8-8. The UpDown server control takes the form of a composite control with a TextBox to hold the value and two Buttons with the captions + and to represent up and down incrementing clicks. Although the UI is not spectacular, it permits us to show how to wire up client script with server events.

The TreeView does not support associating two pictures with a node, one for the collapsed state and one for the expanded state. However, you can change the appearance of the collapse/expand buttons rendered next to every node.

Forms Authentication Forms Authentication has more configuration settings than Anonymous or Windows Authentication, but most of them are seldom used or can be automatically configured with the Web Site Administration Tool. Listing 12-3 shows a basic Forms Authentication configuration in Web.config. Listing 12-3. Configuring Forms Authentication in Web.config <configuration> <system.web> <authentication mode="Forms"> <forms loginUrl="Login.aspx" defaultUrl="default.aspx" timeout="60"/> </authentication> </system.web> </configuration> You specify settings specific to Forms Authentication in the <forms> element, which is a child of the <authentication> element. The <forms> element has a number of parameters, all of which are optional, allowing you to custom-tailor Forms Authentication for your particular application s needs. Table 12-3 lists the various parameters, their purpose, and their default values when left unspecified.

Because a TreeView is rendered using an HTML table, you can set the padding of various elements to control the spacing around text, between nodes, and so on. One other property that comes into play is TreeView.NodeIndent, which sets the number of pixels of indentation (from the left) in each subsequent level of the tree hierarchy. Figure 16-16 shows how these settings apply to a single node.

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