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All of the examples thus far have involved a fair amount of elbow grease in the sense that you had to author all data access logic by hand. While you did offload a good amount of this code to a .NET code library (AutoLotDAL.dll) for reuse in later chapters of the book, you still had to create the various objects of your data provider manually before interacting with the relational database. The next task in this chapter is to look at how you use various Windows Forms database designer tools, which can produce a good deal of data access code on your behalf.

If a paragraph is broken across two pages, some of its lines appear at the top of the next page and the others remain at the bottom of the page. These are referred to as widows and orphans, respectively. This property defines the minimum number of orphans. Value: <integer> Initial value: 2 Inherited: Yes Applies to: Block-level elements Supported by: Opera

Note Windows Presentation Foundation and ASP.NET web projects have similar database designer tools; you ll look at some of these later in this chapter.

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create, update, and delete entities using LINQ syntax and methods on System.Data.Linq.DataContext. Here s an example of constructing and saving a new entity: DataContext dc = new DataContext(connectionString); dc.GetTable<Member>().InsertOnSubmit(new Member { LoginName = "Steve", ReputationPoints = 0 }); dc.SubmitChanges(); Here s an example of retrieving a list of entities in a particular order: DataContext dc = new DataContext(connectionString); var members = from m in dc.GetTable<Member>() orderby m.ReputationPoints descending select m; foreach (Member m in members) Console.WriteLine("Name: {0}, Points: {1}", m.LoginName, m.ReputationPoints); You ll learn more about the internal workings of LINQ queries and the new C# language features that support them later in this chapter. For now, instead of scattering data access code all over the place, let s implement some repositories.

One way you can use these integrated tools is to use the designers supported by the Windows Forms DataGridView control. The problem with this approach is that the database designer tools will embed all of the data access code directly into your GUI code base! Ideally, you want to isolate all of this designer generated code in a dedicated .NET code library, so you can easily reuse your database access logic across multiple projects. Nevertheless, it might be helpful to begin with an examination of how you can use the DataGridView control to generate the required data access code, given that this approach does have some usefulness in small-scale projects and application prototypes. Next, you will learn how to isolate the same designer generated code into a third version of AutoLot.dll.

The DataGridView control has an associated wizard that can generate data access code on your behalf. Begin by creating a brand-new Windows Forms application project named DataGridViewDataDesigner. Rename the initial form to MainForm.cs using the Solution Explorer, and then add an instance of the DataGridView control (named inventoryDataGridView) to your initial form. Note that an inline editor opens to the right-hand side of the control when you do this. From the Choose Data Source drop-down box, select the Add Project Data Source link (see Figure 22-14).

Because it s such a common requirement, ASP.NET has a special API for configuring connection strings. If you add entries to your Web.config file s <connectionStrings> node, such as the following: <configuration> <connectionStrings> <add name="MainDB" connectionString="Server=myServer;Database=someDB; ..."/> <add name="AuditingDB" connectionString="Server=audit01;Database=myDB; ..."/> </connectionStrings> </configuration> then you can access those values via WebConfigurationManager.ConnectionStrings for example: string connectionString = WebConfigurationManager.ConnectionStrings["MainDB"];

Figure 22-14. The DataGridView editor This launches the Data Source Configuration Wizard. This tool guides you through a series of steps that allow you to select and configure a data source, which you can then bind to the DataGridView. The first step of the wizard asks you to identify the type of data source you wish to interact with. Select Database (see Figure 22-15) and click the Next button.

nowing how to calculate specificity is key to mastering CSS, so to that end, we ve created this chart as a quick reference to turn to whenever you need to polish up on your calculations. Bear in mind that while we re only using three columns in this chart, the fourth column to the left still exists for any properties labeled !important, and that the universal selector (*) is equal to 0 in all columns (see 3 for details). The columns in this chart list an example selector, its specificity score, and then a description of which element(s) the selector targets in plain English.

Note In 4, you saw how to apply this technique to retrieve a connection string and use it to configure SportsStore s DI container with Ninject s Bind<service> ... WithConstructorArgument(...) syntax.

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