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In this example, the FirstName and LastName fields map to parameters named @First and @Last. Unfortunately, there s no declarative way to correct this problem and map these parameters to their correct names. Instead, you need to define the new parameters and write a little custom code. The first step is to add two parameters to the SqlDataSource.UpdateParameters collection. Unfortunately, you can t create these while the update is in progress. Instead, you need to add them to the SqlDataSource tag: <asp:SqlDataSource ID="sourceEmployees" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand= "SELECT EmployeeID, FirstName, LastName, TitleOfCourtesy FROM Employees" UpdateCommand="UpdateEmployee" UpdateCommandType="StoredProcedure" OnUpdating="sourceEmployees_Updating" > <UpdateParameters> <asp:Parameter Name="First" Type="String" /> <asp:Parameter Name="Last" Type="String" /> </UpdateParameters> </asp:SqlDataSource> Note that the parameter names don t include the @ symbol when you define them in the SqlDataSource tag. The next step is to react to the SqlDataSource.Updating event, which fires immediately before the update is committed. You can then set the value for the @First and @Last parameters and remove the @FirstName and @LastName parameters from sight. Here s the code you need: protected void sourceEmployees_Updating(object sender, SqlDataSourceCommandEventArgs e) { e.Command.Parameters["@First"].Value = e.Command.Parameters["@FirstName"].Value; e.Command.Parameters["@Last"].Value = e.Command.Parameters["@LastName"].Value; e.Command.Parameters.Remove(e.Command.Parameters["@FirstName"]); e.Command.Parameters.Remove(e.Command.Parameters["@LastName"]); } This represents a fairly typical scenario in which the no-code data binding won t work. Overall, if you can design your stored procedures and classes to work with the data source controls, you ll avoid writing a great deal of code. On the other hand, if you introduce the data source controls to an existing application with a fixed database schema and database components, it may take a fair bit of extra code to fit these pieces together.

To configure a control, click once to select it, or choose it by name in the drop-down list at the top of the Properties window. Then, modify the appropriate properties in the window, such as Text, ID, and ForeColor. These settings are automatically translated to the corresponding ASP.NET control tag attributes and define the initial appearance of your control. Visual Studio even provides special choosers (technically known as UITypeEditors) that allow you to select extended properties. For example, you can select a color from a drop-down list that shows you the color, and you can configure the font from a standard font selection dialog box. To position a control on the page, you need to use all the usual tricks of HTML, such as paragraphs, line breaks, and tables. Unlike previous versions, Visual Studio 2005 doesn t support a grid-layout mode for absolute positioning with CSS (Cascading Style Sheets). Instead, it encourages you to use the more flexible flow-layout mode, where content can grow and shrink dynamically without creating a problem. However, there is a way to get back to the grid-layout behavior. All you need to do is add an inline CSS style for your control that specifies absolute positioning. (This style will already exist in any pages you ve created with a previous version of Visual Studio .NET in gridlayout mode.) Here s an example: <asp:Button id="cmd" style="POSITION: absolute; left: 100px; top: 50px;" runat="server" ... /> Once you ve made this change, you re free to drag the button around the window at will. Of course, you shouldn t go this route just because it seems closer to the Windows GUI (graphical user interface) model. Few great web pages rely on absolute positioning, because it s just too awkward and inflexible.

This example uses the DataBinder.Eval() method to retrieve a piece of information from the data item using reflection. Alternatively, you could cast the e.Row.DataItem to the correct type (such as EmployeeDetails for the ObjectDataSource), DataRowView (for the SqlDataSource in DataSet mode), or DbDataRecord (for the SqlDataSource in DataReader mode). However, the DataBinder.Eval() approach works in all these scenarios (at the cost of being slightly slower).

As you ve seen, when you use the SqlDataSource, you can often avoid writing any data access code. However, you also sacrifice a fair bit of flexibility. Here are the most significant disadvantages: Data access logic embedded in the page: To create a SqlDataSource control, you need to hardcode the SQL statements in your web page. This means you can t fine-tune your query without modifying your web page. In an enterprise application, this limitation isn t acceptable, as it s common to revise the queries after the application is deployed in response to profiling, indexes, and expected loads.

Another timesaving feature that s new in Visual Studio 2005 is the smart tag; smart tags make it easier to configure complex controls. Smart tags aren t offered for all controls, but they are used for rich controls such as the GridView, TreeView, and Calendar. You ll know a smart tag is available if, when you select a control, you see a small arrow in the top-right corner. If you click this arrow, a window will appear with links that trigger other, higherlevel tasks. For example, Figure 2-6 shows how you can use this technique to access Calendar autoformatting. (Smart tags can include many more features, but the Calendar smart tag provides only a single link.)

This isn t the most useful example of using the RowCreated event, but it demonstrates how you can handle the event and read all the important information for the item. You could use much more imaginative formatting to change the way the pager s links are represented, add new buttons to the pager or header, render values that you want to highlight with special fonts and colors, create total and subtotal rows, and more.