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You can adapt this example to work with a stored procedure just as easily. For example, if you have the following stored procedure in your database:

In the previous example, the complete query was hard-coded. Often, you won t have this flexibility. Instead, you ll want to retrieve a subset of data, such as all the products in a given category or all the employees in a specific city. The following example creates a master-details form using parameters. To create this example, you need two data sources. The first data source provides a list of cities (where various employees live). Here s the definition for this SqlDataSource: <asp:SqlDataSource ID="sourceEmployeeCities" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT DISTINCT City FROM Employees"> </asp:SqlDataSource>

Once you ve compiled the assembly, you can use Visual Studio s Website Add Reference command to bring it into your web application This step adds the assembly reference to your webconfig file and copies the assembly to the Bin subdirectory of your application Both approaches have the same ultimate result For example, if you code a database component, you ll access it in the same way regardless of whether it s a compiled assembly in the Bin directory or a source code file in the App_Code directory Similarly, if you use ASPNET s precompilation features (discussed in 18), both options will perform the same way (If you don t, you ll find that the first request to your web application takes longer to execute when you use the App_Code approach, because an extra compilation step is involved.

CREATE PROCEDURE GetEmployeesByCity @City varchar(15) AS SELECT EmployeeID, FirstName, LastName, Title, City FROM Employees WHERE City=@City GO you can change the sourceEmployees data source, as shown here: <asp:SqlDataSource ID="sourceEmployees" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="GetEmployeesByCity" SelectCommandType="StoredProcedure"> <SelectParameters> <asp:ControlParameter ControlID="lstCities" Name="City" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> Not only does this give you all the benefit of stored procedures, but it also streamlines the .aspx portion of your page by removing the actual SQL query, which can be quite lengthy in a realworld page.

Cross-page posting introduces a few wrinkles when you use it in conjunction with the validator controls described in 4. As you learned in 4, when you use the validator controls, you need to check the Page.IsValid property to ensure that the data the user entered is correct. Although users are usually prevented from posting invalid pages back to the server (thanks to some slick client-side JavaScript), this isn t always the case. For example, the client browser might not support JavaScript, or a malicious user could deliberately circumvent the client-side validation checks. When you use validation in a cross-page posting scenario, the potential for some trouble exists. Namely, what happens if you use a cross-page postback and the source page has validation controls Figure 6-4 shows an example with a RequiredFieldValidator that requires input in a text box.

) Although both approaches have essentially the same footprint, they aren t the same for code management This is especially true in cases where you want to reuse the component in more than one web application (or even in different types of NET applications) If you use the App_Code approach with multiple web applications, it s all too easy to make slight modifications and wind up with a mess of different versions of the same shared class The second approach is also more practical for building large-scale applications with a team of developers, in which case you ll want the freedom to have different portions of the web application completed and compiled separately For these reasons, the class library approach is always preferred for professional applications..

Parameter values aren t necessarily drawn from other controls. You can map a parameter to any of the parameter types defined in Table 9-2. Table 9-2. Parameter Types