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After this you check to see whether the component created by the UIComponentTag is an instance of the ShowSource. You can check to see whether the component was of instance UIShowOne, but remember that UIShowOne implements ShowSource, and you want to make sure you can reuse tags such as the ShowListener for other components you might want to create in the future (for example, UIShowMany). Finally, and this is important, you always return SKIP_BODY.

N ote Unlike most of the LINQ to SQL chapters, do not specify a using directive for the nwind namespace for the examples in this chapter.

If you decide to take the route of creating the DBML intermediate file so that you can edit it and then generate your entity class mappings from that, you will need to know the schema and what the element and attribute names mean. Because the schema is subject to change, please consult the Microsoft documentation for the DBML intermediate file schema for the most recent schema definition and explanation. Once you understand the schema, you could choose to manually edit the DBML intermediate file to control entity class and property names and then generate the entity class source code with SQLMetal from your edited DBML intermediate file. Or, even better, you can load the generated DBML intermediate file into Visual Studio s Object Relational Designer and edit it there. This will give you a GUI interface for maintaining your O/R model and free you from the necessity of knowing and understanding the schema. I will describe how to edit your O/R model in the next section.

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In keeping with our style, we are going to jump the gun and give you some tips requiring information we have yet to discuss. So if this section makes little sense to you, our work is done! After all, we want you to know about these tips before you need them, not after you have learned them the hard way.

In addition to the SQLMetal tool, there is also a graphical user tool for generating entity classes that runs inside of Visual Studio. This tool is called the Object Relational Designer, but you will commonly see it referred to as the LINQ to SQL Designer, the O/R Designer, or even DLinq Designer. SQLMetal is designed to generate entity classes for all tables in a database, despite the fact that you do have the ability to be selective by generating an intermediate DBML file, modifying it, and generating entity classes from it. Furthermore, SQLMetal is a command-line utility. For a more selective approach with a graphical user interface, the Object Relational Designer is just the ticket. I will refer to the Object Relational Designer as the designer in this chapter. The designer gives the developer drag and drop design-time entity class modeling. You needn t worry; the designer does most of the difficult work for you. You get the easy parts of selecting the database tables you want modeled and, if it suits you, editing entity class and entity class property names. Of course, you still have the option of doing all the modeling manually in the designer if you desire ultimate control.

Now is a good time to remind you of some of the LINQ to SQL specific tips we provided in 1. One of those tips, titled The DataContext Log, discussed how you could use the DataContext object s Log property to display what the translated SQL query will be. This can be very useful not only for debugging purposes but also for performance analysis. You may find that LINQ to SQL queries are getting translated into very inefficient SQL queries. Or, you may find that because of the deferred loading of associated entity classes, you are making many more SQL queries than necessary. The DataContext.Log property will reveal this type of information to you. To take advantage of this feature, assign the DataContext.Log property to a System.IO.TextWriter object, such as Console.Out. Listing 13-1 contains an example.

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