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You can display a more comforting message to the user on this page. Additionally, you can validate the data before sending it to the database by handling the Updating event in the LINQ data source object. The event handler for this method takes a LinqDataSourceUpdateEventArgs parameter that contains the original values and the new values for the row. Your code can scrutinize the new values, and if they are invalid, your code can set the Cancel property of the LinqDataSourceUpdateEventArgs parameter to false to indicate that the data source should not attempt to update the database. Also, notice that the database is updated as soon as the user clicks the Update button. This is the default functionality implemented by a GridView control that is bound to a LINQ data source and is probably the most suitable mechanism for building interactive Web forms. If you want to modify the update behavior (for example, so that the GridView control will store multiple updates locally and then submit them as a single batch), you can implement your own custom mechanism. However, the details for doing this are outside the scope of this book.
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A key aspect of many Web Forms applications is the ability to navigate from one form to another by clicking a hyperlink or button. In addition, you often need to pass information between forms. In the CustomerData Web form, it would be useful to be able to click a customer and display another form showing the order history for that customer. This is what you will do in the exercises in this section. In this section, you will create a new Web form for displaying order history information. You will use a GridView control to display the data, but you will populate the data by executing a SQL Server stored procedure rather than querying a table. The Northwind database contains a stored procedure called CustOrderHist. This stored procedure takes a customer ID as a parameter and returns a result set containing the name and quantity of each product the customer has ordered. When the user selects a customer in the CustomerData Web form, you must pass the value in the CustomerID column to this new form.
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The rst step, therefore, is to modify the CustomerData Web form to enable the user to select a customer.
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Modify the CustomerData Web form
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1. Return to the Code and Text Editor window displaying the HTML source code for the CustomerData Web form. 2. Change the de nition of the bound eld element displaying the customer ID to a HyperLinkField, as shown here in bold type:
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<asp:HyperLinkField DataField= CustomerID ...></asp:HyperLinkField>
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The data in this column in the GridView control will be displayed as a hyperlink rather than as a label. The user can click this hyperlink. The following steps set properties that specify the actions that occur when this happens. 3. Change the DataField property of the control to a DataTextField property, as shown in bold type here:
<asp:HyperLinkField DataTextField= CustomerID ...></asp:HyperLinkField>
The HyperLinkField control does not have a DataField property. The DataTextField speci es the property from the data source to which the hyperlink binds. 4. Remove the ReadOnly property of the control, and add the Target, DataNavigateUrlFields, and DataNavigateUrlFormatString properties shown in bold type here:
<asp:HyperLinkField DataTextField= CustomerID HeaderText= Customer ID Target= _self DataNavigateUrlFields= CustomerID DataNavigateUrlFormatString= ~\OrderHistory.aspx CustomerID={0} SortExpression= CustomerID > </asp:HyperLinkField>
The DataNavigateUrlFormatString property speci es the address to which the Web application should move when the user clicks the hyperlink. In this example, the application navigates to the OrderHistory.aspx form (which you will create in the next exercise) and includes a query string parameter containing a customer ID. This query string currently contains a placeholder. The DataNavigateUrlFields property determines the value that should be used for this placeholder the data in the CustomerID eld for the current row in the GridView control. The Target property speci es where the OrderHistory. aspx Web form should be displayed. The value _self causes ASP.NET to reuse the same Internet Explorer window that is currently displaying the CustomerData form. Note ASP.NET also provides the HyperLink control in the Standard category in the
Toolbox. When using this control, you can specify a URL to move to in its NavigateUrl property. In addition, you can execute the Transfer method of the Server property of a Web form if you want to transfer control from one Web form to another programmatically.
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