Creating Typed Data Sets in .NET

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There are several paths within Visual Studio 2005 for creating typed data sets You can use the Data Sources window to create a typed data set and tie it to a database through a wizard, or you can use the data set designer and have more direct control over what gets created You already saw one quick example of creating a typed data set with the Data Sources window in 1, and 5 describes how to use that window in more detail This chapter focuses on creating typed data sets with the data set designer Under the covers, the starting point for a typed data set is actually just an XML Schema Definition (XSD) file The schema defines a root document element that will represent the data set itself It needs at least one child element, which will represent a table within the data set That table element can represent its columns as either attributes or child elements The schema definition can contain any number of elements defined as the first child of the root element, and those each become additional tables within the data set When you are working in Visual Studio, its designers and wizards "hide" that you're actually working with XSD files After creating a typed data set as part of your project, you will see an XSD file in Solution Explorer, but whenever you open the file, it opens in the data set designer, which lets you deal with the data set's type definition at an abstract levelyou don't need to know anything about XSD itself
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Creating Typed Data Sets with the Data Set Designer
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To help you become familiar with the Visual Studio features for creating typed data sets, the following sections step you through the process of creating a data access layer for parts of the Northwind database You need to:
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Create a data access layer class library project and add a typed data set definition to it, and set up a data connection in Server Explorer for the database you will work with
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Add tables to the data set by dragging them from Server Explorer into the data set designer
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Creating a Typed Data Set and Setting Up a Data Connection
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Create a new C# Class Library project in Visual Studio 2005 and name itNorthwindDataAccess (see Figure 22) Click OK
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Figure 22 Creating a Data Access Class Library Project in Visual Studio 2005
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Note: You're creating a class library here, not a Windows application Too many demos and samples have you generate your data access code in the client application That is just bad practice from an architectural perspective; I recommend always placing your data access code in a separate class library that you can manage separately from your client application, and potentially reuse it across more than one client application
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Solution Explorer should be visible in the IDE If it is not, display it by selecting Solution Explorer from the View menu Delete the Class1cs file that is added to the class library by default by right-clicking on it in Solution Explorer and selecting Delete from the context menu
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Right-click on the NorthwindDataAccess project in Solution Explorer and select Add > New Item from the pop-up menu Select the DataSet item in the Add New Item dialog as shown in Figure 23
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Figure 23 Adding a Typed Dataset Definition to a Project
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Name the data set CustomersDataSet and click the Add button This adds a CustomersDataSetxsd file to your project and opens the data set designer with a blank canvas
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You can manually add items to a data set definition by dragging and dropping components from the Toolbox to the design surface, in the same way you design Windows Forms using the Toolbox and the design surface for a form But one of the more powerful aspects of the data set designer is its ability to create data set table definitions by dragging items from a database onto the design surface from the Server Explorer window To see this in action, open the Server Explorer window (View > Server Explorer), and create a new data connection to the Northwind database if you don't already have one If you stepped through the example in 1, you already have a data connection for Northwind and you can skip to step 9 below If you still need to add the data connection, right-click on the Data Connections node in the Server Explorer tree and select Add Connection from the context menu The first time you do this, the Change Data Source dialog displays (seeFigure 24) You can select the data source that you want to use for this connection in this dialog The entries in the list are self-explanatory, and the combo box at the bottom lets you select from the available providers for that kind of data source For SQL Server, the NET Framework Data Provider for SQL Server should be selected by default, which is what you want If you are working with SQL Server 2005 Express, select the Microsoft SQL Server Database File option at the top
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