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For example, consider the data-bound page in Figure 9-8. You can create the same page using the custom data access component developed in 8. You can refer to 8 to see the full code, which has the following structure: public class EmployeeDB { public int InsertEmployee(EmployeeDetails emp) { ... } public void DeleteEmployee(int employeeID) { ... } public EmployeeDetails GetEmployee() { ... } public EmployeeDetails[] GetEmployees() { ... } public int CountEmployees() { ... } } The first step to use this class in your page is to define the ObjectDataSource and indicate the name of the class that contains the data access methods. You do this by specifying the fully qualified class name with the TypeName property: <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" TypeName="DatabaseComponent.EmployeeDB" ... />

Usually, you ll have only one key field, as shown here: <asp:GridView ID="gridEmployees" runat="server" DataSourceID="sourceEmployees" DataKeyNames="EmployeeID" ... > Now you can bind the second data source to this field. Here s an example that uses the EmployeeID in a join query to find all the matching records from the Territories table: <asp:SqlDataSource ID="sourceRegions" runat="server" ConnectionString="<%$ ConnectionStrings:Northwind %>" ProviderName="System.Data.SqlClient" SelectCommand="SELECT Employees.EmployeeID, Territories.TerritoryID, Territories.TerritoryDescription FROM Employees INNER JOIN EmployeeTerritories ON Employees.EmployeeID = EmployeeTerritories.EmployeeID INNER JOIN Territories ON EmployeeTerritories.TerritoryID = Territories.TerritoryID WHERE (Employees.EmployeeID = @EmployeeID)" > <SelectParameters> <asp:ControlParameter ControlID="gridEmployees" Name="EmployeeID" PropertyName="SelectedDataKey.Values["EmployeeID"]" /> </SelectParameters> </asp:SqlDataSource> This example defines a SqlDataSource that executes a SELECT statement to get a result set. This method requires a single parameter the EmployeeID of the selected employee record. The EmployeeID value is retrieved from the SelectedDataKey.Values collection. You can look up the EmployeeID field by its index position (which is 0 in this example, because there s only one field in the DataKeyNames list) or by name. The only trick when performing a name lookup is that you need to replace the quotation marks with the corresponding HTML character entity ("). Figure 10-6 shows this master-details form, which contains the regions assigned to an employee whenever an employee record is selected.

For this to work, the DatabaseComponent.EmployeeDB class must exist in the App_Code folder or be compiled in an assembly in the Bin folder.

Figure 10-5. GridView selection In the case of the GridView, the property you need to bind is SelectedIndex. However, this has one problem. SelectedIndex returns a zero-based index number representing where the row occurs in the grid. This isn t the information you need to insert into the query that gets the related records. Instead, you need a key field from the corresponding row. Fortunately, the GridView makes it easy to retrieve this information using the SelectedDataKeys property. To use this feature, you must set the GridView.DataKeyNames property, with a comma-separated list of one or more key fields. Each name you supply must match one of the properties of the bound object or one of the fields of the bound record. Usually, you ll have only one key field, as shown here: <asp:GridView ID="gridEmployees" runat="server" DataSourceID="sourceEmployees" DataKeyNames="EmployeeID" ... > Now you can bind the second data source to this field. Here s an example that uses the EmployeeID in a join query to find all the matching records from the Territories table: <asp:SqlDataSource ID="sourceRegions" runat="server" ConnectionString="<%$ ConnectionStrings:Northwind %>" ProviderName="System.Data.SqlClient" SelectCommand="SELECT Employees.EmployeeID, Territories.TerritoryID, Territories.TerritoryDescription FROM Employees INNER JOIN EmployeeTerritories ON Employees.EmployeeID = EmployeeTerritories.EmployeeID INNER JOIN Territories ON EmployeeTerritories.TerritoryID = Territories.TerritoryID WHERE (Employees.EmployeeID = @EmployeeID)" > <SelectParameters> <asp:ControlParameter ControlID="gridEmployees" Name="EmployeeID" PropertyName="SelectedDataKey.Values["EmployeeID"]" /> </SelectParameters> </asp:SqlDataSource>