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<asp:SqlDataSource ID="sourceProductDetails" runat="server" ProviderName="SystemDataSqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT ProductID, ProductName, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued FROM Products WHERE ProductID=@ProductID" UpdateCommand="UPDATE Products SET ProductName=@ProductName, UnitPrice=@UnitPrice, UnitsInStock=@UnitsInStock, UnitsOnOrder=@UnitsOnOrder, ReorderLevel=@ReorderLevel, Discontinued=@Discontinued WHERE ProductID=@ProductID"> <SelectParameters> <asp:ControlParameter ControlID="lstProduct" Name="ProductID" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> In this example, the parameter names aren t chosen arbitrarily As long as you give each parameter the same name as the field it affects, and preface it with the @ symbol (so ProductName becomes @ProductName), you don t need to define the parameter That s because the ASPNET data controls automatically submit a collection of parameters with the new values before triggering the update Each parameter in the collection uses this naming convention, which is a major time-saver You also need to give the user a way to enter the new values.

Note The basic built-in updating features of the GridView don t give you a lot of flexibility. You can t change

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Most rich data controls make this fairly easy with the DetailsView, it s simply a matter of setting the AutoGenerateEditButton property to True, as shown here: <asp:DetailsView ID="DetailsView1" runat="server" DataSourceID="sourceProductDetails" AutoGenerateEditButton="True" /> Now when you run the page, you ll see an edit link When clicked, this link switches the DetailsView into edit mode All fields are changed to edit controls (typically text boxes), and the Edit link is replaced with an Update link and a Cancel link (see Figure 16-14) Clicking the Cancel link returns the row to its initial state Clicking the Update link triggers an update The DetailsView extracts the field values, uses them to set the parameters in the SqlDataSourceUpdateParameters collection, and then triggers the SqlDataSourceUpdateCommand to apply the change to the database Once again, you don t have to write any code You can create similar parameterized commands for the DeleteCommand and InsertCommand.

the types of controls that are used for editing, format these controls, or add validation. However, you can add all these features by building your own editing templates, a topic you ll consider later in the Using GridView Templates section.

To enable deleting and inserting, you need to set the AutoGenerateDeleteButton and AutoGenerateInsertButton properties of the DetailsView to True To see a sample page that allows updating, deleting, and inserting, refer to the UpdateDeleteInsertaspx page that s included with the downloadable samples for this chapter..

The GridView is a great all-in-one solution for displaying all kinds of data, but it becomes a little unwieldy as the number of fields and rows in your data source grows. Dense grids contribute to large pages that are slow to transmit over the network and difficult for the user to navigate. The GridView has two features that address these issues and make data more manageable: sorting and paging. Both sorting and paging can be performed by the database server, provided you craft the right SQL using the Order By and Where clauses. In fact, sometimes this is the best approach for performance. However, the sorting and paging provided by the GridView and SqlDataSource is easy to implement and thoroughly flexible. These techniques are particularly useful if you need to show the same data in several ways and you want to let the user decide how the data should be ordered.

Returns the exception message, which is a string describing the error state Returns the error code Returns the source file in which the error occurred; useful for locating where an exception was thrown Gets the line in the source file where the exception was thrown; should be used with getFile() Returns an array containing the context backtrace, which is a list of all the methods that are currently executing and their order Same as getTrace(), but returned as a string instead of an array Returns the entire exception represented as a string

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