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The restriction to avoid duplicate URLs is not baked into the navigation system. It s simply required by the XmlSiteMapProvider, because the XmlSiteMapProvider uses the URL as a unique key. If you create your own site map provider or use a third-party provider, you may allow different URLs and require separate key information. However, you can t get around the rule that every site must begin with one root node, because that s implemented in the base SiteMapProvider class. (As you ll see shortly, you still have options for tailoring the display of the site map tree, but you must start with a single home node.)

You need a highly dynamic site map that s generated on the fly. For example, you might want to generate a different site map based on the current user, the query string parameters, and so on. You need to change one of the limitations in the XmlSiteMapProvider implementation. For example, maybe you want the ability to have nodes with duplicate URLs. You have two choices when implementing a custom site map provider. All site map providers derive from the abstract base class SiteMapProvider in the System.Web namespace. You can derive from this class to implement a new provider from scratch. However, if you want to keep the same logic but use a different data store, just derive from the StaticSiteMapProvider class instead. It gives you a basic implementation of many methods, including the logic for node storing and searching. In the following sections, you ll see a custom provider that lets you store site map information in a database.

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Acquiring a connection takes a short, but definite, amount of time. In a web application in which requests are being handled efficiently, connections will be opened and closed endlessly as new requests are processed. In this environment, the small overhead required to establish a connection can become significant and limit the scalability of the system. One solution is connection pooling. Connection pooling is the practice of keeping a permanent set of open database connections to be shared by sessions that use the same data source. This avoids the need to create and destroy connections all the time. Connection pools in ADO.NET are completely transparent to the programmer, and your data access code doesn t need to be altered. When a client requests a connection by calling Open(), it s served directly from the available pool, rather than re-created. When a client releases a connection by calling Close() or Dispose(), it s not discarded but returned to the pool to serve the next request. ADO.NET does not include a connection pooling mechanism. However, most ADO.NET providers implement some form of connection pooling. The SQL Server and Oracle data providers implement their own efficient connection pooling algorithms. These algorithms are implemented entirely in managed code and in contrast to some popular misconceptions do not use COM+ enterprises services. For a connection to be reused with SQL Server or Oracle, the connection string matches exactly. If it differs even slightly, a new connection will be created in a new pool.

Here s a sample site map: <siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0"> <siteMapNode title="Home" description="Home" url="~/default.aspx"> <siteMapNode title="Products" description="Our products" url="~/Products.aspx"> <siteMapNode title="Hardware" description="Hardware choices" url="~/Hardware.aspx" /> <siteMapNode title="Software" description="Software choices" url="~/Software.aspx" /> </siteMapNode> <siteMapNode title="Services" description="Services we offer" url="~/Services.aspx"> <siteMapNode title="Training" description="Training classes" url="~/Training.aspx" /> <siteMapNode title="Consulting" description="Consulting services" url="~/Consulting.aspx" /> <siteMapNode title="Support" description="Support plans" url="~/Support.aspx" /> </siteMapNode> </siteMapNode> </siteMap>

In this example, all navigation links are stored in a single database table. Because databases don t lend themselves easily to hierarchical data, you need to be a little crafty. In this example, each navigation link is linked to a parent link in the same table, except for the root node. This means that although the navigational links are flattened into one table, you can re-create the right structure by starting with the home page and then searching for the subset of rows at each level. Figure 16-14 shows the SiteMap table with some sample data that roughly duplicates the site map you saw earlier in this chapter.

SQL Server and Oracle connection pooling use a full-text match algorithm. That means any minor change in the connection string will thwart connection pooling, even if the change is simply to reverse the order of parameters or add an extra blank space at the end. For this reason, it s imperative that you don t hard-code the connection string in different web pages. Instead, you should store the connection string in one place preferably the <connectionStrings> section of the web.config file.

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