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The final step is to provide a way for the user to add new items. The easiest way to make this possible is to use a rich data control that deals with individual records either the DetailsView or the FormsView. The DetailsView is the simpler of the two, because it doesn t require a template. It s the one used in the following example. Ideally, you d define the DetailsView using a tag like this and let it generate all the fields it needs based on the bound data source:

Unfortunately, this won t work in this example. The problem is that this approach creates too many fields. In this example, you don t want the user to specify the item ID (that s set by the database automatically) or the category ID (that s based on the currently selected category). So neither of these details should appear. The only way to make sure this is the case is to turn off automatic field generation and define each field you want explicitly, as shown here:

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This shopping basket provides you with more flexibility, compared to the PayPal shopping basket over which you have no control and which cannot be saved into your database for further processing and analysis In this chapter, you ll build the shopping cart page (see Figure 9-1) and a shopping cart summary control that shows up in every catalog page except the shopping cart page (see Figure 9-2) You ll also create a shopping cart administration page (see Figure 9-3), which allows the administrator to delete old shopping cart records from the database to prevent the database from growing indefinitely..

The DataSet, once populated, is no longer connected to the data source. This allows the DataSet to be persisted between postbacks, reducing the usage of the data source. You can work with data in a DataSet in any order you choose as many times as you like.

<asp:DetailsView ID="DetailsView1" runat="server" DataSourceID="sourceItems" AutoGenerateRows="False"> <Fields> <asp:BoundField DataField="Title" HeaderText="Title" /> <asp:BoundField DataField="Price" HeaderText="Price"/> <asp:BoundField DataField="Description" HeaderText="Description" /> </Fields> </asp:DetailsView>

You need to make a couple of other changes. To allow inserting, you need to set the AutoGenerateInsertButton to True. This way, the DetailsView creates the links that allow you to start entering a new record and then insert it. At the same time, you can set the DefaultMode property to Insert. This way, the DetailsView is always in insert mode and is used exclusively for adding records (not displaying them), much like the non-data-bound page shown earlier.

After searching the catalog and populating @Products, you set the value of the @HowManyResults output parameter (which will be read from the business tier), by counting the number of rows in @Products: /* Save the number of searched products in an output variable */ SELECT @HowManyResults = COUNT(*) FROM @Products WHERE Rank > 0 Finally, you get back the portion of records from @Products based on the @PageNumber and @ProductsPerPage input parameters: /* Send back the requested products */ SELECT ProductID, Name, Description, Price, Image1FileName, Image2FileName, Rank FROM @Products WHERE Rank > 0 AND RowNumber BETWEEN (@PageNumber-1) * @ProductsPerPage + 1 AND @PageNumber * @ProductsPerPage ORDER BY Rank DESC

The data retrieved through a DataReader is forward-only and must be cycled through by calling Read(). Once the data has been cycled through, the DataReader must be closed and re-created to reaccess the data. Binding expressions can use either the index number of the column in the DataReader or the column name itself. Thus, they re quite simple to write and use. Data retrieved through a DataReader must be requeried for after a postback. A DataReader connects to only one data source.

<asp:DetailsView ID="DetailsView1" runat="server" DefaultMode="Insert" AutoGenerateInsertButton="True" DataSourceID="sourceItems" AutoGenerateRows="False"> ... </asp:DetailsView>

The ObjectDataSource provides the same type of support for updatable data binding as the SqlDataSource. The first step is to specify the UpdateMethod, which needs to be a public instance method in the same class:

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