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In the preceding examples, we have expressed in one query (or two nested queries more precisely) what could be formulated in English as Sort words from a list alphabetically and group them by their length in descending order. We ll leave doing the same without LINQ as an exercise for you. If you take the time to do it, you ll notice that it takes more code and requires dealing a lot with collections. One of the first advantages of LINQ that stands out with this example is the expressiveness it enables: We can express declaratively what we want to achieve using queries instead of writing convoluted pieces of code. We won t take the time right now to get into the details of the code you ve just seen. If you are familiar with SQL, you probably already have a good idea of what the code is doing. In addition to all the nice SQL-like querying, LINQ also provides a number of other functions such as Sum, Min, Max, Average, and much more. They let us perform a rich set of operations. For example, here we sum the amount of each order in a list of orders to compute a total amount:

Windows APIs it uses only core executive APIs known collectively as the Windows native API Smss doesn t use the Win32 APIs because the Windows subsystem isn t executing when Smss launches In fact, one of Smss s first tasks is to start the Windows subsystem Smss then calls the configuration manager executive subsystem to finish initializing the registry, fleshing the registry out to include all its keys The configuration manager is programmed to know where the core registry hives are stored on disk (excluding hives corresponding to user profiles), and it records the paths to the hives it loads in the HKLM\SYSTEM \CurrentControlSet\Control\hivelist key The main thread of Smss performs the following initialization steps: 1 Marks itself as a critical process and its main thread as a critical thread As discussed earlier, this will cause the kernel to crash the system if Smss quits unexpectedly.

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The Many Faces of Microsoft Access Close Internet Explorer and return to the Housing Reservations database in Microsoft Access to continue the tour. Note If you open a table in the Housing Reservations database in Design view, Access locks the table so no other user or program can reference or change the data or object designs. If you try to display a data access page that uses data from the table in Internet Explorer while the table is still open in Design view, you will see no data because Access has the data locked.

You can make working with your data within forms and reports much easier by triggering a macro action. Microsoft Access provides more than 40 actions that you can include in a macro. They perform tasks such as opening tables and forms, running queries, running other macros, selecting options from menus, and sizing open windows. You can also group multiple actions in a macro and specify conditions that determine when each set of actions will or will not be executed by Access. In the Database window, click Macros on the Object bar to see the list of macros in the Housing Reservations database, shown in Figure 2-24. At the upper left corner of the Database window you can see three toolbar buttons to run the selected macro, open the selected macro in Design view, or begin creating a new macro.

Macros are a great way to learn about the basics of responding to events and automating actions in an Access database. However, for any application that you intend to distribute to others, you should use Visual Basic to handle events and automate actions. Nearly all the sample databases use Visual Basic exclusively. You can take a look at the design of the single macro example in the Housing Reservations database, shown in Figure 2-25 on the next page, by selecting it and then clicking the Design button on the Database window toolbar.

decimal totalAmount = orders.Sum(order => order.Amount);

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If you haven t dealt with C# 3.0 yet, you may find the syntax confusing. What s this strange arrow you may wonder. We ll explain this type of code in greater detail later in the book so you can fully understand it. However, before we continue, you may wish to test our Hello LINQ example and start playing with the code. Feel free to do so to get an idea of how easy to use LINQ really is. Once you are ready, let s move on to LINQ to XML and LINQ to SQL. We ll spend some time with these two other flavors of LINQ so you can get an idea of what they taste like. We will get back to LINQ to Objects in detail in part 2 of this book.

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