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If you profile your database, you ll discover that by binding two controls to the same data source, you cause the query to be executed twice On the other hand, if you bind the page manually, you have the ability to bind the same object to two different controls, which means you need to execute the query only once Clearly, the SqlDataSource imposes a bit of unnecessary extra overhead here, but if you re aware of it you can design accordingly First, you should consider caching, which the SqlDataSource supports natively (see 11 for a full discussion) Second, realize that most of the time you won t be binding more than one control to a data source That s because the rich data controls the GridVew, DetailsView, and FormsView have the ability to present multiple pieces of data in a flexible layout.

Similar to the previous section in spirit, and are the pair of signals relating to the deletion of model instances. They function almost identically to their saving counterparts, except that they both provide just the and arguments. When using , keep in mind that the instance passed in to the listener will have already been removed from the database, so many of its methods will raise exceptions if used. This is especially true if it had previously related to instances of other models. Those relationships will have been lost by the time is triggered, so any handling of those situations should be done in or by overriding the method on the model. Also, because the instance will have been deleted, its primary key value will no longer match up with anything in the database. However, in order to more accurately keep track of which object was deleted, the primary key value is left intact on the instance, and can be read using the shortcut described earlier in this chapter.

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If you use these controls, you ll need to bind only one control, which allows you to steer clear of this limitation It s also important to note that data binding is performed at the end of your web-page processing, just before the page is rendered That means the PageLoad event will fire, followed by any control events, followed by the PagePreRender event, and only then will the data binding take place The data binding is performed on every postback (unless you redirect to another page) If you need to write code that springs into action after the data binding is complete, you can override the PageOnPreRenderComplete() method This method is called immediately after the PreRender stage but just before the view state is serialized and the actual HTML is rendered..

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> This data source fills a drop-down list with city values: <asp:DropDownList ID="lstCities" runat="server" DataSourceID="sourceEmployeeCities" DataTextField="City" AutoPostBack="True"> </asp:DropDownList> The list control has automatic postback enabled, which ensures that the page is posted back every time the list selection is changed, giving your page the chance to update its data-bound controls accordingly. The other option is to create a dedicated button (such as Select) next to the list control for initiating the postback.

When you select a city, the second data source retrieves all the employees in that city. Here s the definition for the second data source: <asp:SqlDataSource ID="sourceEmployees" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT EmployeeID, FirstName, LastName, Title, City FROM Employees WHERE City=@City"> <SelectParameters> <asp:ControlParameter ControlID="lstCities" Name="City" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> The trick here is the query is written using a parameter. Parameters are always indicated with an @ symbol, as in @City. You can define as many symbols as you want, but you must map each provider to another value. In this example, the value for the @City parameter is taken from the lstCities.SelectedValue property. However, you could just as easily modify the ControlParameter tag to bind to another property or control. Now when you run the page, you can view the employees in a specific city (see Figure 9-8).

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