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<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>

You can also read and write to binary files. Binary data uses space more efficiently but also creates files that aren t human-readable. If you open a file in Notepad, you ll see a lot of extended ASCII characters (politely known as gibberish). To open a file for binary writing, you need to create a new BinaryWriter object. The constructor accepts a stream, which you can retrieve using the File.OpenWrite() method. Here s the code to open the file c:\binaryfile.bin for binary writing: FileStream fs = File.OpenWrite(@"c:\binaryfile.bin"); BinaryWriter w = new BinaryWriter(fs); .NET concentrates on stream objects, rather than the source or destination for the data. This means you can write binary data to any type of stream, whether it represents a file or some other type of storage location, using the same code. In addition, writing to a binary file is almost the same as writing to a text file. string str = "ASP.NET Binary File Test"; int integer = 42; w.Write(str); w.Write(integer); w.Close();

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Reading data from a binary file is easy, but not quite as easy as reading data from a text file. The problem is that you need to know the data type of the data you want to retrieve. To retrieve a string, you use the ReadString() method. To retrieve an integer, you must use ReadInt32(). That s why the preceding code example writes variables instead of literal values. If the value 42 were hard-coded as the parameter for the Write() method, it wouldn t be clear if the value would be written as a 16-bit integer, 32-bit integer, decimal, or something else. Unfortunately, you may need to micromanage binary files in this way to prevent errors. BinaryReader r = new BinaryReader(File.OpenRead(@"c:\binaryfile.bin")); string str; int integer; str = r.ReadString(); integer = r.ReadInt32(); r.Close(); Once again, if you want to use file sharing, you need to use File.Open() instead of File.OpenRead(). You can then create a BinaryReader by hand, as shown here: FileStream fs = File.Open(@"c:\binaryfile.bin", FileMode.Open, FileAccess.Read, FileShare.Read); BinaryReader r = new BinaryReader(fs);

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

Note You have no easy way to jump to a location in a text or binary file without reading through all the

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.

Creating XML documents is a key part of modern web programming. You will often need to export data using XML formats. You have several existing options for creating XML documents,

information in order. Although you can use methods such as Seek() on the underlying stream, you need to specify an offset in bytes, which involves some fairly involved calculations based on data type sizes. If you need to store a large amount of information and move through it quickly, you need a dedicated database, not a binary file.

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