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As you ve already learned, you can create a GridView that shows all your fields by setting the AutoGenerateColumns property to True. Unfortunately, when you use this approach you lose the ability to control any of the details over your columns, including their order, formatting, sorting, and so on. To configure these details, you need to set AutoGenerateColumns to False and define your columns explicitly. This requires more work, and it s a bit tedious. However, there is a nifty trick that solves this problem. You can use explicit columns but get Visual Studio to create the column tags for you automatically. Here s how it works: select the GridView control, and click Refresh Schema in the smart tag. At this point, Visual Studio will retrieve the basic schema information from your data source (for example, the names and data type of each column) and then add one <BoundField> element for each field.

Figure 16-14. Using an edit template When binding an editable value to a control, you must use the Bind() method in your data binding expression instead of the ordinary Eval() method. Unlike the Eval() method, which can be placed anywhere in a page, the Bind() method must be used to set a control property. Only the Bind() method creates the two-way link, ensuring that updated values will be returned to the server.

Tip If you modify the data source so it returns a different set of columns, you can regenerate the GridView columns. Just select the GridView, and click the Refresh Schema link in the smart tag. This step will wipe out any custom columns you ve added (such as editing controls).

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One interesting detail here is that even though the item template shows three fields, the editing template allows only one of these to be changed. When the GridView commits an update, it will submit only the bound, editable parameters. In the previous example, this means the GridView will pass back a @ReorderLevel parameter but not a @UnitsInStock or @UnitsOnOrder parameter. This is important, because when you write your parameterized update command, it must use only the parameters you have available. Here s the modified SqlDataSource control with the correct command: <asp:SqlDataSource ID="sourceProducts" runat="server" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT ProductID, ProductName, UnitPrice, UnitsInStock, UnitsOnOrder,ReorderLevel FROM Products" UpdateCommand="UPDATE Products SET ProductName=@ProductName, UnitPrice=@UnitPrice, ReorderLevel=@ReorderLevel WHERE ProductID=@ProductID"> </asp:SqlDataSource>

The set_exception_handler() function defines what to do when an exception makes it all the way up your call stack to the main function entry without being caught. Usually, you will see a message like this: Fatal error: Uncaught exception 'Exception' in file.php:2 Stack trace: #0 {main} thrown in file.php on line 2 This is the built-in exception handler. It can be useful, but it can also expose sensitive information, such as database login credentials. It is advantageous to disable this handler in production environments, by using php.ini, .htaccess, or ini_set(). Alternatively, if you wish to know about the exceptions that occur but still not display those exceptions, you can use the

Once you ve created your columns, you can also use some helpful design-time support to configure the properties of each column (rather than editing the column tag by hand). To do this, select the GridView, and click the ellipsis ( . . . ) next to the Columns property in the Properties window. You ll see a Fields dialog box that lets you add, remove, and refine your columns (see Figure 17-2).

Now that you have your template ready, why not add an extra frill, such as a validator, to catch editing mistakes In the following example, a RangeValidator prevents changes that put the ReorderLevel at less than 0 or more than 100: <asp:TemplateField HeaderText="Status"> <ItemStyle Width="100px" /> <ItemTemplate> <b>In Stock:</b> <%# Eval("UnitsInStock") %><br /> <b>On Order:</b> <%# Eval("UnitsOnOrder") %><br /> <b>Reorder:</b> <%# Eval("ReorderLevel") %> </ItemTemplate> <EditItemTemplate> <b>In Stock:</b> <%# Eval("UnitsInStock") %><br /> <b>On Order:</b> <%# Eval("UnitsOnOrder") %><br /><br /> <b>Reorder:</b> <asp:TextBox Text='<%# Bind("ReorderLevel") %>' Width="25px" runat="server" id="txtReorder" /> <asp:RangeValidator id="rngValidator" MinimumValue="0" MaximumValue="100" ControlToValidate="txtReorder" runat="server" ErrorMessage="Value out of range." Type="Integer"/> </EditItemTemplate> </asp:TemplateField> Figure 16-15 shows the validation at work. If the value isn t valid, the browser doesn t allow the page to be posted back, and no database code runs.

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