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When you click a select button, the page is posted back, and a series of steps unfolds. First, the GridView.SelectedIndexChanging event fires, which you can intercept to cancel the operation. Next, the GridView.SelectedIndex property is adjusted to point to the selected row. Finally, the GridView.SelectedIndexChanged event fires, which you can handle if you want to manually update other controls to reflect the new selection. When the page is rendered, the selected row is given the selected row style.

Sometimes you ll need to set a parameter with a value that isn t represented by any of the parameter classes in Table 16-1. Or, you might want to manually modify a parameter value before using it. In both of these scenarios, you need to use code to set the parameter value just before the database operation takes place. For example, consider the page shown in Figure 16-13. It includes two data-bound controls. The first is a list of all the customers in the database. Here s the markup that defines the list and its data source: <asp:SqlDataSource ID="sourceCustomers" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT CustomerID, ContactName FROM Customers" /> <asp:DropDownList ID="lstCustomers" runat="server" DataSourceID="sourceCustomers" DataTextField="ContactName" DataValueField="CustomerID" AutoPostBack="True"> </asp:DropDownList>

Tip Rather than add the select button yourself, you can choose Enable Selection from the GridView s smart tag,

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Figure 16-13. Using parameters in a master-details page When the user picks a customer from the list, the page is posted back (because AutoPostBack is set to True) and the matching orders are shown in a GridView underneath, using a second data source. This data source pulls the CustomerID for the currently selected customer from the drop-down list using a ControlParameter: <asp:SqlDataSource ID="sourceOrders" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT OrderID,OrderDate,ShippedDate FROM Orders WHERE CustomerID=@CustomerID"> <SelectParameters> <asp:ControlParameter Name="CustomerID" ControlID="lstCustomers" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> <asp:GridView ID="gridOrders" runat="server" DataSourceID="sourceOrders"> </asp:GridView> Now, imagine you want to limit the order list so it only shows orders made in the last week. This is easy enough to accomplish with a Where clause that examines the OrderDate field. But there s a catch. It doesn t make sense to hard-code the OrderDate value in the query itself, because the range is set based on the current date. And there s no parameter that provides exactly the information you need. The easiest way to solve this problem is to add a new parameter one that you ll be responsible for setting yourself: <asp:SqlDataSource ID="sourceOrders" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT OrderID,OrderDate,ShippedDate FROM Orders WHERE CustomerID=@CustomerID AND OrderDate>=@EarliestOrderDate" OnSelecting="sourceOrders_Selecting">

You don t need to create a new column to support row selection. Instead, you can turn an existing column into a link. This technique is commonly implemented to allow users to select rows in a table by the unique ID value. To use this technique, remove the CommandField column, and add a ButtonField column instead. Then, set the DataTextField to the name of the field you want to use. <asp:ButtonField ButtonType="Button" DataTextField="ProductID" /> This field will be underlined and turned into a button that, when clicked, will post back the page and trigger the GridView.RowCommand event. You could handle this event, determine which row has been clicked, and programmatically set the SelectedIndex property of the GridView. However, you can use an easier method. Instead, just configure the link to raise the SelectedIndexChanged event by specifying a CommandName with the text Select, as shown here: <asp:ButtonField CommandName="Select" ButtonType="Button" DataTextField="ProductID" /> Now clicking the data field automatically selects the record.

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