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Next, it continues by calling the HAL function HalInitSystem, which gives the HAL a chance to gain system control before Windows performs significant further initialization One responsibility of HalInitSystem is to prepare the system interrupt controller of each CPU for interrupts and to configure the interval clock timer interrupt, which is used for CPU time accounting (See the section Quantum Accounting in 5 for more on CPU time accounting) When HalInitSystem returns control, InitBootProcessor proceeds by computing the reciprocal for timer expiration Reciprocals are used for optimizing divisions on most modern processors They can perform multiplications faster, and because Windows must divide the current 64-bit time.

The custom menu bar in the LawTrack Contacts database (Custom Form Menu Bar) uses the original Edit, Insert, Records, and Window menus, but it has customized File, Tools, and Help menus, and it doesn t include the View or Format menus at all To make your new menu match, select the New Menu category, which provides one special entry that allows you to start a new menu on the menu bar Drag the New Menu command from the Commands list to your menu bar three times, once for each of the custom menus you need to build Right-click each New Menu item, and change its name to reflect the menu name you want, as shown in Figure 24-8 on the next page.

The LINQ samples at http://msdn2.microsoft.com/en-us/bb330936.aspx include an expression tree visualizer project that can evaluate an expression tree and display it in a treeview control.

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Adding an ampersand (&) before one of the letters in the menu name establishes the access key for that menu item, much like using an ampersand in the Caption property of a form label or command button..

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Additionally, we ll dig deeper with the expression trees at the end of this book, when we investigate extending LINQ to use a web service provided by Amazon. For now, the important thing to take away is to understand the difference between LINQ to Objects and LINQ to SQL and how the IQueryable interface can be used to perform the key translations that make the technology work. So far we ve shown how LINQ to SQL knows how to map the data to classes. We also have shown how it translates our query expressions into a syntax the database understands. By combining these features, the .NET 3.5 Framework has provided a powerful querying functionality. As we demonstrated in chapter 6, LINQ to SQL is not limited to only viewing data. It also maintains information necessary to persist our changes back to the database. Let s continue our look under the covers by seeing what happens to our objects in their life cycle after we fetch them.

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If LINQ to SQL were limited to mapping data between relational data and objects, it would represent yet another in a long line of object-relational mapping solutions. As we ve already seen, LINQ offers the capability to construct strongly typed queries directly within the language. Beyond that, the framework includes support to manage object changes and to optimize the database interaction based on those values. The DataContext object continues to play a pivotal role in the entity s life cycle. As we ve already seen, the DataContext manages the connection to the database. In addition, it evaluates the mappings and translates the expression trees into consumable structures. If we were only concerned with viewing data, the mapping and translation services would be sufficient for our needs. The life cycle would end the moment we fetched the objects. As applications work with the results of queries, they typically view the data and make changes. We need a mechanism for tracking the changes that are made and maintaining those values until they are no longer needed. Additionally, we need to retain the changes so that we can commit them to the database. To handle the rest of the object s life cycle, the DataContext also manages references to the retrieved objects. It watches as changes are made to them by tracking the retrieved object s identities and the changed values. Figure 7.4 illustrates the services offered by the DataContext. The life cycle begins when we first read a value from the database. Prior to passing the resulting object on to the consuming application code, the DataContext retains a reference to the object. An identity management service tracks the

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