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Styles are not simple single-value properties. Instead, each style exposes a Style object that includes properties for choosing colors (ForeColor and BackColor), adding borders (BorderColor, BorderStyle, and BorderWidth), sizing the row (Height and Width), aligning the row (HorizontalAlign and VerticalAlign), and configuring the appearance of text (Font and Wrap). These style properties allow you to refine almost every aspect of an item s appearance. Here s an example that changes the style of rows and headers in a GridView: <asp:GridView ID="GridView1" runat="server" DataSourceID="sourceProducts" AutoGenerateColumns="False"> <RowStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" /> <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#F7F7F7" /> <Columns> <asp:BoundField DataField="ProductID" HeaderText="ID" /> <asp:BoundField DataField="ProductName" HeaderText="Product Name" /> <asp:BoundField DataField="UnitPrice" HeaderText="Price" /> </Columns> </asp:GridView> In this example, every column is affected by the formatting changes. However, you can also define column-specific styles. To create a column-specific style, you simply need to rearrange the control tag

Another important fact to understand about the data source controls is that when you bind more than one control to the same data source, you cause the query to be executed multiple times For example, if two controls are bound to the same data source, the data source control performs its query twice once for each control This is somewhat inefficient after all, if you wrote the data binding code yourself by hand, you d probably choose to perform the query once and then bind the returned DataSet twice Fortunately, this design isn t quite as bad as it might seem First, you can avoid this multiple-query overhead using caching, which allows you to store the retrieved data in a temporary memory location where it will be reused automatically The SqlDataSource supports automatic caching if you set EnableCaching to True.

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so that the formatting tag becomes a nested tag inside the appropriate column tag. Here s an example that formats just the ProductName column: <asp:GridView ID="GridView2" runat="server" DataSourceID="sourceProducts" AutoGenerateColumns="False" > <Columns> <asp:BoundField DataField="ProductID" HeaderText="ID" /> <asp:BoundField DataField="ProductName" HeaderText="Product Name"> <ItemStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" /> <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#F7F7F7" /> </asp:BoundField> <asp:BoundField DataField="UnitPrice" HeaderText="Price" /> </Columns> </asp:GridView> Figure 16-3 compares these two examples. You can use a combination of ordinary style settings and column-specific style settings (which override ordinary style settings if they conflict).

26 provides a full discussion of how caching works and how you can use it with the SqlDataSource Second, contrary to what you might expect, most of the time you won t be binding more than one control to a data source That s because the rich data controls you ll learn about in 17 the GridView, DetailsView, and FormsView have the ability to present multiple.

ntroduced in PHP 5, exceptions are a critical part of any OOP application. The term exception refers to the entire machinery of try, catch, and throw statements, and the Exception class. This machinery is designed to help you define when a problem occurs and what the code should do when a problem is encountered. Exceptions give you control over how your program generates and handles errors. Exceptions also make your programming life easier by providing details about the context of the exception. By using exceptions, you will be able to create more robust applications that are fault-tolerant and that can inform an administrator when problems arise. In this chapter, I will show you how to use built-in exceptions, as well as how to extend exceptions in your own applications.

Figure 16-3. Formatting the GridView One reason you might use column-specific formatting is to define specific column widths. If you don t define a specific column width, ASP.NET makes each column just wide enough to fit the data it contains (or, if wrapping is enabled, to fit the text without splitting a word over a line break). If values range in size, the width is determined by the largest value or the width of the column header, whichever is larger. However, if the grid is wide enough, you might want to expand a column so it doesn t appear to be crowded against the adjacent columns. In this case, you need to explicitly define a larger width.

pieces of data in a flexible layout. If you use these controls, you ll need to bind only one control, which allows you to steer clear of this limitation. It s also important to remember that data binding is performed at the end of your web page processing, just before the page is rendered. This means the Page.Load event will fire, followed by any control events, followed by the Page.PreRender event, and only then will the data binding take place. Data binding is performed on every postback (unless you redirect to another page).

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