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As we covered earlier, you can think of filegroups as logical containers for database disk files. As shown in figure 9.4, the default configuration for a new database is a single filegroup called primary, which contains one data file in which all database objects are stored. Before we cover recommended filegroup configurations, let s look at some of the ways in which filegroups are used (and abused), beginning with controlling object placement.

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For performance reasons and due to their intrinsic nature, relational databases are usually normalized Normalization is a process that eliminates redundancy, organizes data efficiently, and reduces the potential for anomalies during data operations and improves data consistency Normalization results in an organization of data that is specific to the relational data model This prevents a direct mapping of tables and records to objects and collections Relational databases are normalized in tables and relations, whereas objects use inheritance, composition, and complex reference graphs A common problem exists because relational databases don t have concepts like inheritance: Mapping a class hierarchy to a relational database requires using tricks Programming models In SQL, we write queries, and so we have a higher-level, declarative way of expressing the set of data that we re interested in With imperative.

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Figure 11 6 shows a finely crafted isometric tileset named dg_iso32.png, which contains a good variation of ground floor tiles, object tiles like walls, trees, and houses, as well as adornment objects or items that can be placed on any ground tile. The tiles in this set are each 54x49 pixels in size. The height can be chosen arbitrarily; it can be more or less than 49 pixels and depends on how much overlap between tiles you like in your tilemap. The actual height of the diamond shape is 27 pixels. This will become important when you create the tilemap in Tiled.

Comparing this query, we can see that the only real change in listing 6.1 is the source of the data. The LINQ query is identical. But a quick look at the generated SQL statement shows that we ve now fetched only the rows and fields that we want. Additionally, we re performing the join, filter, and sort on the server. Here is the SQL that is generated from our LINQ to SQL query:

EnablePhotoButtons(bm);

Photograph p = _album.FirstPhoto; while (p != null) { // Do something with Photograph p = _album.NextPhoto; }

11.3.1 Creating the CVE Viewer application Once we have the files, we create a new WPF Application project called CVE Viewer, delete Window1.xaml as usual, create a new window called CveViewer.xaml, and point the StartupUri to it. The layout here is going to be a bit more involved than the ProcessMonitor, so we need to do a bit more setup than we did before. The final layout appears in figure 11.7.

The final thing you need to do with your method is let the BDC know what method type you ve just described. This is done by adding the MethodInstances element to the end of your method description, as shown in listing 2.14.

ADDING IMAGES TO AN ALBUM In chapter 3, the Click handler for the Load menu permitted a single file to be selected using the OpenFileDialog class. This made sense when only a single image was managed by the application. In this chapter, the idea of an album permits multiple images to be present at the same time. As a result, our user should also be able to load multiple images at once. This is again done using the OpenFileDialog class, so the code for this handler will be similar to the Click event handler for the Load menu from chapter 3. The Multiselect property is provided by the OpenFileDialog class to indicate whether multiple files can be selected in the dialog. This and other members specific to this class are summarized in .NET Table 6.1.

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