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By default, the Data controls are arranged so the display controls are on top, and the DataSource controls are below (You can drag them into any order you like or arrange them alphabetically by right-clicking on any control and selecting Sort Items Alphabetically.) There is a DataSource control for use with Microsoft SQL Server or SQL Server Express, one for Microsoft Access, one for any type of Object, one for use with SiteMaps (for binding to menu controls more on this in 6), and one for XML documents as a data source. Since the AdventureWorks database is a SQL Server database, you ll use the SqlDataSource control whether you are using SQL Server or SQL Server Express. This control will allow you to access the AdventureWorks database, but first you need to direct the control where to find it. Switch to Design view and drag the SqlDataSource control from the Toolbox directly onto the design surface. A Smart Tag will open, as seen in Figure 4-3.
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When you click on Configure Data Source, you invoke a wizard that will walk you through the steps of configuring your data source hooking up the control to the underlying data table(s). The first step is to create (or choose) a data connection as seen in Figure 4-4.
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Previous data connections in this web site will be listed in the drop-down menu. To make a new connection, click the New Connection button to get the Add Connection dialog shown in Figure 4-5.
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4: Saving and Retrieving Data
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Following the steps in Figure 4-5, prepare your connection to the database: 1. Select your server from the Server Name drop-down menu. If it is not there, type the name of the server. Typically, if you are using SQLExpress, the name will be .\SqlExpress (dot-slash then SqlExpress) and if you are using SQL Server it will be the name of your computer, or it will be (local) including the parentheses. 2. Leave the radio button set to Use Windows Authentication.
If Windows Authentication does not work, you may need to use SQL Server authentication. If so, your database administrator will tell you what credentials to enter. They may or may not be the same as your Windows login credentials.
Getting Data from a Database |
3. Select the option, Select or enter a database name: . 4. Choose the AdventureWorks database in the database name drop-down. 5. Click the Test Connection button to verify that it all works. This dialog box constructs a connection string, which provides the information necessary to connect to a database on a server. Click OK to complete the string and return to the Configure Data Source Wizard. Click the plus mark next to Connection string to see the connection string you ve just created, as shown in Figure 4-6. The segment Integrated Security=True was created when you chose Windows Authentication rather than SQL Server Authentication.
In Figure 4-6, the Wizard displays an expanded data connection in the drop-down menu, consisting of the name of the server (in this case the local machine, virtdell380, concatenated with sqlexpress, followed by the name of the database and database owner). You don t need to enter this information yourself.
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4: Saving and Retrieving Data
When you click Next, the Wizard will ask if you d like to save this Connection string in the application configuration file. In an ASP.NET program, the application configuration file is web.config, and saving the connection string there is an excellent idea, so be sure to check the checkbox and give the string a name you can easily remember. The Wizard will make a suggestion for the name of the connection string, as shown in Figure 4-7.
This will cause the following lines to be written to web.config:
<connectionStrings> <add name="AdventureWorksConnectionString" connectionString="Data Source=.\SqlExpress; Initial Catalog=AdventureWorks;Integrated Security=True" providerName="System.Data.SqlClient"/> </connectionStrings>
The Wizard next prompts you to configure the SELECT statement. The SELECT statement is the SQL code the control uses to retrieve the exact subset of data you are looking for from the database. Fortunately, if you are not fluent in SQL (most often pronounced see-quill ), the Wizard will help you build the statement.
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