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This section, which is new in ASP.NET 2.0, allows you to define connection strings that will be used elsewhere in your application. Seeing as connection strings need to be reused exactly to support connection pooling and may need to be modified without recompiling the web application, it makes perfect sense to store them in the web.config file. You can add as many connection strings as you want. For each one, you need to specify the ADO.NET provider name (see 7 for more information). Here s an example that defines a single connection string: < xml version="1.0" encoding="utf-8" > <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <connectionStrings> <add name="NorthwindConnection" connectionString= "Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind;" providerName="System.Data.SqlClient" /> </connectionStrings> <system.web>...</system.web> </configuration>

You add custom settings to a web.config file in a special element called <appSettings>. Here s where the <appSettings> section fits into the web.config file: < xml version="1.0" encoding="utf-8" > <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <appSettings> <!-- Custom application data goes here. --> </appSettings> <system.web>...</system.web> </configuration> The custom settings that you add are written as simple string variables. You might want to use a special web.config setting for several reasons. Often, you ll want the ability to record hard-coded but changeable information for connecting to external resources, such as database connection strings, file paths, and web service URLs. Because the configuration file can be modified at any time, this allows you to update the configuration of an application as its physical deployment characteristics change without needing to recompile it. Custom settings are entered using an <add> element that identifies a unique variable name (the key) and the variable contents (the value). The following example adds two new custom configuration settings: < xml version="1.0" encoding="utf-8" > <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <appSettings> <add key="websiteName" value="My New Website"/> <add key="welcomeMessage" value="Welcome to my new Website, friend!"/> </appSettings> <system.web>...</system.web> </configuration> Once you ve added this information, .NET makes it extremely easy to retrieve it in your webpage code. You simply need to use the ConfigurationSettings class from the System.Configuration namespace. It exposes a property called AppSettings, which contains a dynamically built collection of available application settings for the current directory. For example, if the ASP.NET page class

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get_db_prep_lookup(self, lookup_type, value)

referencing the AppSettings collection is at a location such as http://localhost/MyApp/ MyDirectory/MySubDirectory, it is possible that the AppSettings collection contains settings from three different web.config files. The AppSettings collection makes that hierarchy seamless to the page that s using it. To use the ConfigurationSettings class, it helps to first import the System.Configuration namespace so you can refer to the class without needing to use the long fully qualified name, as shown here: using System.Configuration; Next, you simply need to retrieve the value by name. The following example fills two labels using the custom application information: protected void Page_Load(object sender, EventArgs e) { lblSiteName.Text = ConfigurationManager.AppSettings["websiteName"]; lblWelcome.Text = ConfigurationManager.AppSettings["welcomeMessage"]; } Figure 5-4 shows the test web page in action.

The shell s preprocessing of the command line before passing it to a command saves the programmer a great deal of work.

Figure 5-4. Retrieving custom application settings An error won t occur if you try to retrieve a value that doesn t exist. If you suspect this could be a problem, make sure to test for a null reference before retrieving a value.

Values in the <appSettings> element of a configuration file are available to any class in your application or to any component that your application uses, whether it s a web form class, a business logic class, a data access class, or something else. In all these cases, you use the ConfigurationSettings class in the same way.

One other area where fields have to interact with the database is when making comparisons between Python objects and values already stored in the database. This takes place every time a QuerySet s method is used, for instance, in order to generate the necessary database query. Since comparisons might require different handling than saving, Django uses the method to manage this task. When called, this method receives two explicit arguments, detailing how the lookup is expected to take place. The first, , is the type of comparison that was requested in

ASP .NET 2.0 introduces a new model for reading configuration files. It revolves around the new WebConfigurationManager and Configuration classes in the System.Web.Configuration namespace, which allow you to extract information from a configuration file at runtime. The WebConfigurationManager is the starting point. It provides the members shown in Table 5-3.

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