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You can also search for nodes using the methods of the current SiteMapProvider object, which is available through the SiteMap.Provider static property. For example, the SiteMap.Provider.FindSiteMapNode() method allows you to search for a node by its URL.

As mentioned before, IIS supports an extensible framework to support the processing of dynamic files Part of that framework is the concept of application mappings Application mappings contain information that tells IIS which ISAPI extension to use to process certain types of files This is how IIS knows to process requests for aspx pages using the ASPNET ISAPI extension Application mappings play a big role in ASPNET security because ASPNET can only manage security for files mapped to the ASPNET ISAPI extension Otherwise, IIS handles the entire request and never passes it off to ASPNET for processing If you re using Integrated Windows Authentication in IIS and Windows Authentication in ASPNET, then you won t notice any problems due to application mappings Both IIS and ASPNET use the same account and group information to make authentication and authorization decisions.

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Returns the node one level up in the navigation hierarchy, which contains the current node. On the root node, this returns a null reference. Provides a collection of all the child nodes. Check the HasChildNodes property to determine if there are child nodes. Returns the previous node that s at the same level (or a null reference if no such node exists). Returns the next node that s at the same level (or a null reference if no such node exists).

If, however, you re using Anonymous Authentication in IIS and Forms Authentication in ASPNET, then you may experience some odd behavior for file extensions not mapped to ASPNET Here s a scenario that will help outline the problem Let s say that you have a web application to help people track expenses Employees can enter expenses into the system and managers can see expense tracking reports generated from those entries Your application writes Excel files with the tracking information to a reports folder An ASPNET page in that folder called ViewReportsaspx allows managers to easily search for reports To ensure that only managers can access the Excel reports in that folder, you create a Webconfig file with an <authorization> section allowing the Manager role to access the directory but denying access to the Employee role Unfortunately, Excel files are not mapped to the ASP.

To see this in action, consider the following code, which configures two labels on a page to show the heading and description information retrieved from the current node: protected void Page_Load(object sender, EventArgs e) { lblHead.Text = SiteMap.CurrentNode.Title; lblDescription.Text = SiteMap.CurrentNode.Description; } The next example is a little more ambitious. It implements the previous/next links, which allow the user to traverse an entire set of subnodes. The code checks for the existence of sibling nodes, and if there aren t any in the required position, it simply hides the links. protected void Page_Load(object sender, EventArgs e) { if (SiteMap.CurrentNode.NextSibling != null) { lnkNext.NavigateUrl = SiteMap.CurrentNode.NextSibling.Url; lnkNext.Visible = true; } else { lnkNext.Visible = false; } }

Because both custom controls and the Page class inherit from Control, ViewState is easily accessible to the ASP.NET developer from either the web form or from within a custom control class. As described in the previous section, the type of the ViewState collection that is serialized into the __VIEWSTATE hidden form field is System.Web.UI.StateBag, a strongly typed dictionary data structure that stores name/value pairs with the value having a type that is either serializable or has a TypeConverter defined. Native data types such as int, string, and so forth have default TypeConverters that provide string-to-value conversions, so no additional work is required on the part of the developer. In situations where a developer creates a custom type for use in a server control, we recommend that the developer create a TypeConverter class for the custom type in place of implementing ISerializable. The reason is that types that are only defined as serializable are slower and generate much larger ViewState than types that have a TypeConverter implemented. We discuss how to create a TypeConverter in 11. An alternative to implementing a TypeConverter is to customize how property data is stored in ViewState. The System.Web.UI.Control class provides two methods for this purpose: SaveViewState and LoadViewState. As you would guess, these methods must be implemented in tandem.

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