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SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT * FROM Products WHERE ProductID=@ProductID"> <SelectParameters> <asp:ControlParameter ControlID="lstProduct" Name="ProductID" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> You always indicate parameters with an @ symbol, as in @City You can define as many parameters as you want, but you must map each one to a value using a separate element in the SelectParameters collection In this example, the value for the @ProductID parameter comes from the lstProductSelectedValue property In other words, you are binding a value that s currently in a control to place it into a database command (You could also use the SelectedText property to get the currently displayed text, which is the ProductName in this example) Now all you need to do is bind the SqlDataSource to the remaining controls where you want to display information This is where the example takes a slightly different turn.

a block of markup that s reused for each record in a table. However, they work only with certain rich data controls, such as the GridView. You ll learn more about this feature in 17.

In the previous version of the record editor, you took the information and used a combination of values to fill in details in a label and a list control This type of approach doesn t work well with data source controls First, you can bind only a single data field to most simple controls such as lists Second, each bound control makes a separate request to the SqlDataSource, triggering a separate database query This means if you bind a dozen controls, you ll perform the same query a dozen times, with terrible performance You can.

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If you decide not to use single-value data binding, you can accomplish the same thing using code. For example, you could use the following event handler to display the same output as the first label example: Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles Me.Load TransactionCount = 10 lblDynamic.Text = "There were " & TransactionCount.ToString() lblDynamic.Text &= " transactions today. " lblDynamic.Text &= "I see that you are using " & Request.Browser.Browser End Sub This code dynamically fills in the label without using data binding. The trade-off is more code. When you use data binding expressions, you end up complicating your markup with additional details about your code (such as the names of the variables in your code-behind class). When you use the code-only approach, you end up doing the reverse complicating your code with additional details about the page markup (like the text you want to display). In many cases, the best approach depends on your specific scenario. Data binding expressions are great for injecting small bits of information into an otherwise detailed page. The dynamic code approach gives you more flexibility, and works well when you need to perform more extensive work to shape the page (for example, interacting with multiple controls, changing content and formatting, retrieving the information you want to display from different sources, and so on).

alleviate this problem with data source caching (see 23), but it indicates you aren t designing your application in a way that lends itself well to the data source control model. The solution is to use one of the rich data controls, such as the GridView, DetailsView, or FormView. These controls have the smarts to show multiple fields at once, in a highly flexible layout. You ll learn about these three controls in detail in the next chapter, but the following example shows a simple demonstration of how to use the DetailsView. The DetailsView is a rich data control that s designed to show multiple fields in a data source. As long as its AutoGenerateRows is true (the default), it creates a separate row for each field, with the field caption and value. Figure 15-12 shows the result.

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Figure 15-12. Displaying full product information in a DetailsView Here s the basic DetailsView tag that makes this possible: <asp:DetailsView ID="detailsProduct" runat="server" DataSourceID="sourceProductDetails" /> As you can see, the only property you need to set is DataSourceID. That binds the DetailsView to the SqlDataSource you created earlier. This SqlDataSource gets the full product information for a single row, based on the selection in the list control. Best of all, this whole example still hasn t required a line of code.

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