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The key detail that allows this to work is that the variable is static That s because ASPNET creates a pool of HttpApplication classes to serve multiple requests As a result, each request might be served with a different HttpApplication object, and each HttpApplication object has its own instance data However, there is only one copy of the static data, which is shared for all instances Another requirement is that you must supply the ClassName attribute in the Application directive This assigns a name to the global application class, which you ll need to use to retrieve the static value you ve just created Of course, for the best encapsulation (and the most flexibility), you should use property procedures: private static string[] fileList; public static string[] FileList { get { return fileList; } } When you add a member variable to the global.

There s no reason to hard-code a connection string. As discussed in 5, the <connectionStrings> section of the web.config file is a handy place to store your connection strings. Here s an example: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <connectionStrings> <add name="Northwind" connectionString= "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI"/> </connectionStrings> ... </configuration> You can then retrieve your connection string by name from the WebConfigurationManager.ConnectionStrings collection, like so: string connectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString; The following examples assume you ve added this connection string to your web.config file.

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asax file, it has essentially the same characteristics as a value in the Application collection In other words, you can use any NET data type, the value is retained until the application domain is restarted, and state isn t shared across computers in a web farm However, there s no automatic locking Because multiple clients might try to access or modify a value at the same time, you should use the C# lock statement to temporarily restrict the variable to a single thread Depending on how your data is accessed, you might perform the locking in the web page (in which case you could perform several tasks at once with the locked data) or in the property procedures or methods in the globalasax file (in which case the lock would be held for the shortest possible time).

Here s an example with the GridView from the previous section: <ItemTemplate> <a href='<%# Eval("Url") %>' target='<%# Eval("[target]") %>'><%# Eval("Title") %></a> <br /> <%# Eval("Description") %> </ItemTemplate> The one trick in this example is that you need to use square brackets around the attribute name to indicate that the value is being looked up (by name) in the data item s indexer If your navigation control doesn t support templates (or you don t want to create one), you ll need to find another approach Both the TreeView and Menu classes expose an event that fires when an individual item is bound (TreeNodeDataBound and MenuItemDataBound) You can then customize the current item To apply the new target, you use this code: Protected Sub TreeView1_TreeNodeDataBound(ByVal sender As Object, ByVal e As TreeNodeEventArgs) SiteMapNode sn = CType(eNodeDataItem, SiteMapNode) eNode.

Once you ve chosen your connection string, managing the connection is easy you simply use the Open() and Close() methods. You can use the following code in the Page.Load event handler to test a connection and write its status to a label (as shown in Figure 7-2): // Create the Connection object. string connectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString; SqlConnection con = new SqlConnection(connectionString); try { // Try to open the connection. con.Open(); lblInfo.Text = "<b>Server Version:</b> " + con.ServerVersion; lblInfo.Text += "<br /><b>Connection Is:</b> " + con.State.ToString(); } catch (Exception err) { // Handle an error by displaying the information. lblInfo.Text = "Error reading the database. "; lblInfo.Text += err.Message; } finally { // Either way, make sure the connection is properly closed. // Even if the connection wasn't opened successfully, // calling Close() won't cause an error. con.Close(); lblInfo.Text += "<br /><b>Now Connection Is:</b> "; lblInfo.Text += con.State.ToString(); } Figure 7-2 shows the results of running this code.

Here s an example of property procedure that maintains a threadsafe global collection of metadata: private static Dictionary<string, string> metadata = new Dictionary<string, string>(); public void AddMetadata(string key, string value) { lock (metadata) { metadata[key] = value; } } public string GetMetadata(string key) { lock (metadata) { return metadata[key]; } } Using static member variables instead of the Application collection has two advantages First, it allows you to write custom code in a property procedure You could use this code to log how many times a value is being accessed, to check if the data is still valid, or to re-create it Here s an example that uses a lazy initialization pattern and creates the global object only when it s first requested: private static string[] fileList; public static string[] FileList { get { if (fileList == null) { fileList = DirectoryGetFiles(.

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