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Figure 17-19. A FormView that shows a single record Here s the markup you need to define the drop-down list and its data source: <asp:SqlDataSource ID="sourceProducts" runat="server" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT * FROM Products"> </asp:SqlDataSource>

<asp:DropDownList ID="lstProducts" runat="server" AutoPostBack="True" DataSourceID="sourceProducts" DataTextField="ProductName" DataValueField="ProductID" Width="184px"> </asp:DropDownList> The FormView uses the template from the previous example (it s the shaded region on the page). Here s the markup for the FormView (not including the template) and the data source that gets the full details for the selected product. <asp:SqlDataSource ID="sourceProductFull" runat="server" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT * FROM Products WHERE ProductID=@ProductID"> <SelectParameters> <asp:ControlParameter Name="ProductID" ControlID="lstProducts" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> <asp:FormView ID="formProductDetails" runat="server" DataSourceID="sourceProductFull" BackColor="#FFE0C0" CellPadding="5"> <ItemTemplate> ... </ItemTemplate> </asp:FormView>

Note If you want to support editing with the FormView, you need to add button controls that trigger the

Figure 4-11. The Solver Answer report (panes split for readability)

Giving each record a unique id value is essential for Cake to function without trouble. This application is simple, so you may be able to get by without creating an id field set to auto_increment. However, it s good practice to make sure that all your records in the database can be identified by a unique value and that it s named id, because then Cake can generate scaffolding around your table without any code on your part. Once you begin creating associated tables, then it will be mandatory to include an id field.

In this chapter, you considered everything you need to build rich data-bound pages. You took a detailed tour of the GridView and considered its support for formatting, selecting, sorting, paging, using templates, and editing. You also considered the DetailsView and the FormView, which allow you to display and edit individual records. Using these three controls, you can build all-in-one pages that display and edit data, without needing to write pages of ADO.NET code. Best of all, every data control is thoroughly configurable, which means you can tailor it to fit just about any web application.

here s a good reason that this book covered ADO.NET before dealing with simpler data access techniques, such as writing and reading ordinary files. Traditional file access is generally much less useful in a web application than it is in a desktop program. Databases, on the other hand, are designed from the ground up to support a large number of simultaneous users with speed, safety, and efficiency. Most web applications will rely on a database for some features, but many won t have any reason to use direct file access. Of course, enterprising ASP.NET developers can find a use for almost any technology. If this book didn t cover file access, no doubt many developers would be frustrated when designing web applications with legitimate (and innovative) uses for ordinary files. In fact, file access is so easy and straightforward in .NET that it may be perfect for simple, small-scale solutions that don t need a full-fledged database product like SQL Server. This chapter explains how you can use the classes in .NET to read and change file system information and even build a simple file browser. You ll also learn how to create simple text and binary files of your own. Finally, you ll consider how you can allow users to upload their own files to your web server.