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The code is lean and economical: For Each rowAuthor As DataRow In dsPubs.Tables("Authors").Rows lblList.Text &= "<br /><b>" & rowAuthor("au_fname") lblList.Text &= " " & rowAuthor("au_lname") & "</b><br />" For Each rowTitleAuthor As DataRow In _ rowAuthor.GetChildRows(Authors_TitleAuthor) For Each rowTitle As DataRow In _ rowTitleAuthor.GetParentRows(Titles_TitleAuthor) lblList.Text &= "  " lblList.Text &= rowTitle("title") & "<br />" Next Next Next Figure 15-19 shows the final result. If authors and titles have a simple one-to-many relationship, you could leave out the inner For Each statement and use simpler code, as follows: For Each rowAuthor As DataRow In dsPubs.Tables("Authors").Rows ' Display author. For Each rowTitle As DataRow In rowAuthor.GetChildRows(Authors_Titles) ' Display title. Next Next Having seen the more complicated example, you re ready to create and manage multiple DataRelation objects on your own.

ObjectDataSource: This data source allows you to connect to a custom data access class. This is the preferred approach for large-scale professional web applications, but it forces you to write much more code. You ll study the ObjectDataSource in 22. XmlDataSource: This data source allows you to connect to an XML file. You ll learn more about XML in 18. SiteMapDataSource: This data source allows you to connect to a .sitemap file that describes the navigational structure of your website. You saw this data source in 13. EntityDataSource: This data source allows you to query a database using the LINQ to Entities feature, which you ll tackle in 24. LinqDataSource: This data source allows you to query a database using the LINQ to SQL feature, which is a similar (but somewhat less powerful) predecessor to LINQ to Entities.

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You can find all the data source controls in the Data tab of the Toolbox in Visual Studio, with the exception of the AccessDataSource. When you drop a data source control onto your web page, it shows up as a gray box in Visual Studio. However, this box won t appear when you run your web application and request the page (see Figure 15-11).

Note Using a DataRelation implies certain restrictions. For example, if you try to create a child row that

Note If you do not want to work with WSDL files on the client side, you can provide null as a parameter

If you perform more than one data access task in the same page (for example, you need to be able to query two different tables), you ll need more than one data source control.

refers to a nonexistent parent, ADO.NET will generate an error. Similarly, you can t delete a parent that has linked children records. These restrictions are already enforced by the data source, but by adding them to the DataSet, you ensure that they will be enforced by ADO.NET as well. This technique can allow you to catch errors as soon as they occur rather than waiting until you attempt to commit changes to the data source.

Data source controls can perform two key tasks: They can retrieve data from a data source and supply it to bound controls. When you use this feature, your bound controls are automatically filled with data. You don t even need to call DataBind(). They can update the data source when edits take place. In order to use this feature, you must use one of ASP.NET s rich data controls, like the GridView or DetailsView. For example, if you make an edit in the GridView and click Update, the GridView will trigger the update in the data source control, and the data source control will then update the database.

If this isn t the behavior you want, there s an easy solution. When you create the DataRelation, pass an extra parameter to the constructor with the value False: Dim Titles_TitleAuthor As New DataRelation("Titles_TitleAuthor", _ dsPubs.Tables("Titles").Columns("title_id"), _ dsPubs.Tables("TitleAuthor").Columns("title_id"), False)

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