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made by step 1 will not be committed to the database. This ensures that the system stays in one of its two valid states the initial state (with no money transferred) and the final state (with money debited from one account and credited to another). Transactions are characterized by four properties popularly called ACID properties. ACID is an acronym that represents the following concepts: Atomic: All steps in the transaction should succeed or fail together. Unless all the steps from a transaction complete, a transaction is not considered complete. Consistent: The transaction takes the underlying database from one stable state to another. Isolated: Every transaction is an independent entity. One transaction should not affect any other transaction running at the same time. Durable: Changes that occur during the transaction are permanently stored on some media, typically a hard disk, before the transaction is declared successful. Logs are maintained so that the database can be restored to a valid state even if a hardware or network failure occurs. Note that even though these are ideal characteristics of a transaction, they aren t always absolutely attainable. One problem is that in order to ensure isolation, the RDBMS needs to lock data so that other users can t access it while the transaction is in progress. The more locks you use, and the coarser these locks are, the greater the chance that a user won t be able to perform another task while the transactions are underway. In other words, there s often a trade-off between user concurrency and isolation.

All of the examples thus far have involved a fair amount of elbow grease in the sense that you had to author all data access logic by hand. While you did offload a good amount of this code to a .NET code library (AutoLotDAL.dll) for reuse in later chapters of the book, you still had to create the various objects of your data provider manually before interacting with the relational database. The next task in this chapter is to look at how you use various Windows Forms database designer tools, which can produce a good deal of data access code on your behalf.

Impersonation does not give you the ability to circumvent Windows security. You must still have the credentials for the user you want to impersonate, whether you write them into your code or a user provides them at runtime.

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Note Windows Presentation Foundation and ASP.NET web projects have similar database designer tools; you ll look at some of these later in this chapter.

One way you can use these integrated tools is to use the designers supported by the Windows Forms DataGridView control. The problem with this approach is that the database designer tools will embed all of the data access code directly into your GUI code base! Ideally, you want to isolate all of this designer generated code in a dedicated .NET code library, so you can easily reuse your database access logic across multiple projects. Nevertheless, it might be helpful to begin with an examination of how you can use the DataGridView control to generate the required data access code, given that this approach does have some usefulness in small-scale projects and application prototypes. Next, you will learn how to isolate the same designer generated code into a third version of AutoLot.dll.

ASP .NET has two types of impersonation. Configured (web.config) impersonation allows you to specify that page requests should be run under the identity of the user who is making the request. Programmatic impersonation gives you the ability to switch to another identity within the code and switch back to the original identity when a specific task is finished. You ll learn about both of these techniques in the following sections.

The DataGridView control has an associated wizard that can generate data access code on your behalf. Begin by creating a brand-new Windows Forms application project named DataGridViewDataDesigner. Rename the initial form to MainForm.cs using the Solution Explorer, and then add an instance of the DataGridView control (named inventoryDataGridView) to your initial form. Note that an inline editor opens to the right-hand side of the control when you do this. From the Choose Data Source drop-down box, select the Add Project Data Source link (see Figure 22-14).

To impersonate other users when running on Windows 2000, the account that does the impersonation must have the Act As Part of the Operating System permission. This permission is not required on Windows XP and later.

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