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The disadvantage is that your code is tightly bound to the GridView, because you need to pull out the information you want by position, using hard-coded column index numbers The basic strategy is to react to the GridViewDataBound event This occurs immediately after the GridView is populated with data At this point, you can t access the data source any longer, but you can navigate through the GridView as a collection of rows and cells Once this total is calculated, it s inserted into the footer row Here s the complete code: Protected Sub GridView1_DataBound(ByVal sender As Object, ByVal e As EventArgs) Dim valueInStock As Decimal = 0 ' The Rows collection includes rows only on the current page ' (not "virtual" rows) For Each row As GridViewRow In GridView1Rows Dim price As Decimal = DecimalParse(rowCells(2)Text) Dim unitsInStock As Integer = IntegerParse(rowCells(3).

Like overloaded operators, methods that are qualified with the implicit or explicit keywords have special names in terms of CIL: op_Implicit and op_Explicit, respectively (see Figure 12-4).

Note The Visual Studio 2010 Object Browser shows custom conversion operators using the explicit operator and implicit operator icons.

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Text) valueInStock += price * unitsInStock Next ' Update the footer Dim footer As GridViewRow = GridView1FooterRow ' Set the first cell to span over the entire row footerCells(0)ColumnSpan = 3 footerCells(0)HorizontalAlign = HorizontalAlignCenter ' Remove the unneeded cells footerCellsRemoveAt(2) footerCellsRemoveAt(1) ' Add the text footerCells(0)Text = "Total value in stock (on this page): " _ & valueInStockToString("C") End Sub The summary row has the same number of columns as the rest of the grid As a result, if you want your text to be displayed over multiple cells (as it is in this example), you need to configure cell spanning by setting the ColumnSpan property of the appropriate cell In this example, the first cell spans over three columns (itself, and the next two on the right) Figure 10-20 shows the final result..

As you can see at the listing above, in the flex-services.xml configuration file I import also the flexremoting.xml configuration file. <services> <service-include file-path="flex-remoting.xml" /> <service-include file-path="flex-messages.xml" /> </services>

That wraps up our look at defining custom conversion routines. As with overloaded operators, remember that this bit of syntax is simply a shorthand notation for normal member functions, and in this light it is always optional. When used correctly, however, custom structures can be used more naturally, as they can be treated as true class types related by inheritance.

Earlier in this chapter, you saw a master/detail page that used a GridView and DetailsView. This gives you the flexibility to show the child records for just the currently selected parent record. However, sometimes you want to create a parent/child report that shows all the records from the child table, organized by parent. For example, you could use this to create a complete list of products organized by category. The next example demonstrates how you show a complete, subgrouped product list in a single grid. The basic technique is to create a GridView for the parent table that contains an embedded GridView for each row. These child GridView controls are inserted into the parent GridView using a TemplateField. The only trick is that you can t bind the child GridView controls at the same time that you bind the parent GridView, because the parent rows haven t been created yet. Instead, you need to wait for the GridView.DataBound event to fire in the parent. In this example, the parent GridView defines two columns, both of which are the TemplateField type. The first column combines the category name and category description: <asp:TemplateField HeaderText="Category"> <ItemStyle VerticalAlign="Top" Width="20%"></ItemStyle> <ItemTemplate> <br /> <b><%# Eval("CategoryName") %></b> <br /><br /> <%# Eval("Description" ) %> <br /> </ItemTemplate> </asp:TemplateField> The second column contains an embedded GridView of products, with two bound columns. Here s an excerpted listing that omits the style-related attributes:

.NET 3.5 introduced the concept of extension methods, which allow you to tack on new functionality to precompiled types on the fly. As you know, once a type is defined and compiled into a .NET assembly, its

<asp:TemplateField HeaderText="Products"> <ItemStyle VerticalAlign="Top"></ItemStyle> <ItemTemplate> <asp:GridView runat="server"> <Columns> <asp:BoundField DataField="ProductName" HeaderText="Product Name"></asp:BoundField> <asp:BoundField DataField="UnitPrice" HeaderText="Unit Price" DataFormatString="{0:C}"></asp:BoundField> </Columns> </asp:GridView> </ItemTemplate> </asp:TemplateField> Now all you need to do is create two data sources, one for retrieving the list of categories and the other for retrieving all products in a specified category The first query fills the parent GridView, and the second query is called multiple times to fill the child GridView You can bind the first grid directly to the data source, as shown here: <asp:GridView id="gridMaster" runat="server" DataKeyNames="CategoryID" DataSourceID="sourceCategories" OnRowDataBound="gridMaster_RowDataBound" .. > This part of the code is typical The trick is to bind the child GridView controls If you leave out this step, the child GridView controls won t appear To bind the child GridView controls, you need to react to the GridViewRowDataBound event, which fires every time a row is generated and bound to the parent GridView.

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