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The final step, before we start to write some classes and inject these into the container, is to tell the Eclipse IDE that our project is a Spring project; this option lets us use some of the IDE functionalities provided by the Spring tools Eclipse plug-ins that you should have already installed. (If you haven t installed them yet, follow the instructions in the previous chapters.) It is simple to make Eclipse aware of your Spring project just right-click on the project and choose the item Add Spring Project Nature, as shown in Figure 4-11. Once you do, you will be able to use the Spring IDE tools.

In addition to the .NET namespaces that define the types of a specific data provider, the .NET base class libraries provide a number of additional ADO.NET-centric namespaces, some of which you can see in Table 21-3 (again, 24 will address the assemblies and namespaces specific to Entity Framework). Table 21-3. Select Additional ADO.NET-Centric Namespaces

With SSL, all traffic will be encrypted, not just the sensitive data. For this reason, many web servers use a hardware accelerator to improve the performance of encryption with SSL.

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This namespace provides types that facilitate CLR and SQL Server 2005 and later integration services. This namespace defines the core ADO.NET types used by all data providers, including common interfaces and numerous types that represent the disconnected layer (e.g., DataSet and DataTable). This namespace contains types shared between all ADO.NET data providers, including the common abstract base classes. This namespace contains types that allow you to discover Microsoft SQL Server instances installed on the current local network. This namespace contains native data types used by Microsoft SQL Server. You can always use the corresponding CLR data types, but the SqlTypes are optimized to work with SQL Server (e.g., if your SQL Server database contains an integer value, you can represent it using either int or SqlTypes.SqlInt32).

Remember, SSL is not tied to ASP.NET in any way. If you want to learn more about SSL, consult a book dedicated to security and IIS such as IIS Security (Osbourne/McGraw-Hill, 2002).

Note that this chapter does not examine every type within every ADO.NET namespace (that task would require a large book all by itself); however, it is quite important that you understand the types within the System.Data namespace.

ASP .NET implements the concept of gatekeepers (introduced previously) through HTTP modules. Each module is a class implementing the interface IHttpModule, and each module acts as a gatekeeper of the ASP.NET infrastructure. Of course, HTTP modules are used for other tasks, but lots of them are security related. As you can see in Figure 19-9, ASP .NET includes several authentication and authorization modules.

Of all the ADO.NET namespaces, System.Data is the lowest common denominator. You cannot build ADO.NET applications without specifying this namespace in your data access applications. This namespace contains types that are shared among all ADO.NET data providers, regardless of the underlying data store. In addition to a number of database-centric exceptions (e.g., NoNullAllowedException, RowNotInTableException, and MissingPrimaryKeyException), System.Data contains types that represent various database primitives (e.g., tables, rows, columns, and constraints), as well as the common interfaces implemented by data provider objects. Table 21-4 lists some of the core types you should be aware of. Table 21-4. Core Members of the System.Data Namespace

Because web applications use the stateless HTTP, no information is retained for the user between requests. As a result, the user must be authenticated and authorized at the beginning of each request. ASP.NET handles this by firing global application events. Authentication modules can handle these events to perform user authentication. Not all requests require authentication or authorization. However, the related events always fire. These events are handled by the configured HTTP modules demonstrated in Figure 19-9. Of course, you can handle the events through the global application class as well (these events are defined in the code-behind class of the global.asax file), but for higher reusability we recommend creating separate Http modules, because it is really easy to create them. The two primary events you need to deal with are the AuthenticateRequest and AuthorizeRequest events. These aren t the only events that fire, but these are the most useful. Figure 19-10 shows the order of security-related application events.

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