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Here s the class declaration for the provider: public class SqlSiteMapProvider : StaticSiteMapProvider { ... } The first step is to override the Initialize() method to get all the information you need from the web.config file. The Initialize() method gives you access to the configuration element that defines the site map provider. In this example, your provider needs three pieces of information: The connection string for the database. The name of the stored procedure that returns the site map. The provider name for the database. This allows you to use provider-agnostic coding (as described in 7). In other words, you can support SQL Server, Oracle, or another database equally easily, as long as there s a .NET provider factory installed. You can configure your web application to use the custom provider (SqlSiteMapProvider) and supply the required three pieces of information using the <siteMap> section of the web.config file: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <siteMap defaultProvider="SqlSiteMapProvider"> <providers> <add name="SqlSiteMapProvider" type="SqlSiteMapProvider" providerName="System.Data.SqlClient" connectionString= "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI" storedProcedure="GetSiteMap" /> </providers> </siteMap> ... </system.web> </configuration> Now in your provider you simply need to retrieve these three pieces of information and store them for later: private string connectionString; private string providerName; private string storedProcedure; public override void Initialize(string name, System.Collections.Specialized.NameValueCollection attributes) { if (!IsInitialized) { base.Initialize(name, attributes); // Retrieve the web.config settings. providerName = attributes["providerName"]; connectionString = attributes["connectionString"]; storedProcedure = attributes["storedProcedure"]; if (providerName == null || providerName.Length == 0) throw new Exception("The provider name was not found."); else if (connectionString == null || connectionString.Length == 0) throw new Exception("The connection string was not found.");

else if (storedProcedure == null || storedProcedureLength == 0) throw new Exception("The stored procedure name was not found"); initialized = true; } } private bool initialized = false; public virtual bool IsInitialized { get { return initialized; } } The real work that the provider does is in the BuildSiteMap() method, which constructs the SiteMapNode objects that make up the navigation tree In the lifetime of an application, you ll typically construct the SiteMapNode once and reuse it multiple times To make that possible, the provider needs to store the site map in memory: private SiteMapNode rootNode; The root SiteMapNode contains the first level of nodes, which then contain the next level of nodes, and so on Thus, the root node is the starting point for the whole navigation tree You override the BuildSiteMap() method to actually create the site map.

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Configuration is an often-overlooked aspect of web application development. Many times, budgetary or time constraints force developers to sidestep proper configuration practices in the hope that it will somehow speed up the development time table. In reality, proper configuration practices such as using custom configuration sections and strongly typed configuration files may take a bit more time in the beginning, but you quickly make that time back up over the course of the development process.

Accessing ViewState in this way results in a hidden form variable, like the following one, that contains not only the values loaded by all controls with ViewState enabled but also the data loaded in our example: <input type="hidden" name="__VIEWSTATE" value="dDw2MDQ5NjY2NDk7dDxw... " /> Reading back the value is a simple process of accessing the ViewState collection when the form is posted back to the web server. ASP.NET checks the ViewState data for its hash value and ensures no unscheduled modifications have taken place prior to populating the collection: string name = ViewState["task"]; As described previously, ViewState uses the well-known <input type="hidden" name="__VIEWSTATE"> HTML tag to hold the page s state data. No special browser techniques or proprietary mechanisms are required to work with ViewState. The primary consideration with ViewState is the serialization process used to dehydrate and rehydrate state for each server control in the page s control tree. On a web form with either numerous server controls or controls with large amounts of data, the size of the __VIEWSTATE hidden variable can be large. Because ViewState data is transported over the wire for each round-trip, it s recommended that developers turn off ViewState for controls that don t need to retain state. This can greatly decrease the size of the generated ViewState transported with the HTML document. ViewState emissions are handled through the EnableViewState property that all controls inherit from System.Web.UI.Control. Developers need to be cognizant of this ability to disable ViewState when building server controls.

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