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In the last couple of chapters, we discussed the core components of working with relational data using LINQ to SQL. We saw how the mapping metadata combined with the IQueryable interface and expression trees to enable us to apply the same LINQ to Objects query expressions to relational data stores. By leveraging common APIs, we can eliminate vast amounts of data plumbing code and focus more directly on the business needs. In this chapter, we re going to extend the basic concepts and see some of LINQ to SQL s more advanced features. We ll begin by expanding on our discussion of the object life cycle, focusing on concurrency and transaction issues. We ll continue by exploring how we can work more directly with the database and take advantage of some of the more specific functionality offered by SQL Server. Moving beyond the data tier, we ll look at options LINQ to SQL gives us to customize the business tier, including precompiling query expressions, using partial classes, and polymorphism via inheritance. We ll conclude by briefly exploring the upcoming Entity Framework as an alternative to LINQ to SQL for accessing relational data.

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Table 25-1.

In this case, we re referring to the client in a generic sense. The client does not have to be a person or presentation layer. The client is anything that consumes the LINQ to SQL entities. This can include a SOA service or data access tier.

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Define a list item within a bulleted list. Insert the text for the line between these tags. Designate a hyperlink. You code the hyperlink address following the tag name inside the begin tag. Your browser displays any text or any image object you include between the begin and end tags as a hyperlink, and your browser follows the defined hyperlink when you click on the text or image. You can use these tags between other tags, such as between <p> </p> to have only a portion of the paragraph text display as a hyperlink. Specifies an image object that your browser displays. You define the location of the image following the tag name inside the tag. You can surround this tag with <a></a> to create a graphic hyperlink. Note that this tag does not have an end tag because you cannot define other objects inside an image object. Define a table. Between these begin and end tags you use other tags such as <tr></tr> (table row) to define the format of a row and <td></td> (table data) to define the data displayed in a row. Following the tag name inside the begin tag, you can define attributes such as the width of the table, the border style, and the spacing between cells in the table.

(Details on the processing of the driver load control information on the registry are also covered in 7) Finally, the Windows subsystem device names are created as symbolic links in the object manager s namespace 33 The transaction manager sets up the Windows software trace preprocessor (WPP) and ETW and initializes with WMI (ETW and WMI are described in 4).

Below is an HTML example for a very simple Web page:

<html> <head> <title>My Simple HTML</title> </head> <body> <STRONG>This is my simple page showing some simple HTML commands</STRONG> </body> </html>

The process can end here by just displaying the resulting objects to the consumer. If necessary, the user can make changes to the objects and submit those changes back via the DataContext. The DataContext evaluates the submitted data and compares it against the change-tracking store to determine which values need to be sent back to the database. The DataContext packages these changes up and issues the appropriate statements back to the server either using parameterized queries or stored procedures. If it uses parameterized queries, it automatically manages concurrency control. If problems occur during the update, they are handled by the transaction mechanisms that are implicitly or explicitly defined. Once the data is committed, the cycle is ready to start all over again. At this point, we should be equipped with the tools needed to use LINQ to work with relational data. As with any tool, the ability to use the tool will depend on how much it is used. We could spend several chapters going over numerous usage permutations, but it would be impossible to cover every situation. Before moving on to LINQ to XML in the next chapter, take some time to work with LINQ to SQL, try the examples included in this book, and then extend them to meet business needs. Increased familiarity will help you identify the capabilities of the tool and decide where it fits in your data access toolkit.

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