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Probably the most common control used in data-bound ASPNET Web applications prior to ASPNET 20 was the DataGrid control, which allows the presentation of tabular data Like the Windows Forms DataGrid control, the ASPNET DataGrid control was easy to use for simple scenarios, but it left a lot to be desired for more advanced scenarios As a result, the ASPNET team followed the same approach as the Windows Client teaminstead of trying to "fix" or improve the existing control while maintaining backward compatibility, they decided to replace it outright The result is the GridView control The GridView control functions much like theDataGrid control did for simple scenarios You set a data source, apply some styling, and when data binding occurs, the items in the bound collection are rendered as rows in an HTML table, with each column or property in the data source items displayed in a column in the row However, the GridView capabilities go way beyond that and make common and more advanced scenarios far easier For example, as mentioned earlier, to support editing, selecting, sorting, and paging with the DataGrid control required handling events on postback that weren't particularly easy or intuitive to get right until you had done it a few times In the GridView control, you just set a control's property and specify that you want it to support one or several of those functions, and this control takes care of it All of the postback handling is encapsulated for you for the most common scenarios, but the events are still raised, letting you handle custom situations in a consistent way The grid's styling capabilities have been improved, as well as its ability to use templates for containing custom cell contents The GridView is also designed to work with the data source controls to allow it to communicate changes back through the data source control it is bound to when the user edits data through the control The data source can then ensure that changes are persisted automatically Working with the GridView control in the designer has been beefed up; you can handle most common scenarios declaratively through designer interactions and wizards, so that you often can get very complex data binding and formatting set up without writing a single line of code by hand To hook up simple data binding, you set the control's DataSourceID property to the ID of the corresponding page's data source control As shown earlier, you can also still set the DataSource and DataMember properties and programmatically call DataBind to have explicit control over the data-binding process if desired You have already seen some simple uses of theGridView in the code examples in this appendix For a slightly more complex example, the code in Listing A7 shows the markup for a GridView that supports the sorting, editing, paging, deleting, and selecting of rows
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Listing A7 GridView Control Example
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<asp:GridView ID="GridView1" runat="server"
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AllowPaging="True" AllowSorting="True"
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AutoGenerateColumns="False" DataKeyNames="CustomerID" DataSourceID="SqlDataSource1" EmptyDataText="There are no data records to display"> <Columns>
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<asp:CommandField ShowDeleteButton="True" ShowEditButton="True" ShowSelectButton="True" />
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<asp:BoundField DataField="CustomerID" HeaderText="CustomerID" ReadOnly="True" SortExpression="CustomerID" /> <asp:BoundField DataField="CompanyName"
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HeaderText="CompanyName" SortExpression="CompanyName" /> <asp:BoundField DataField="ContactName" HeaderText="ContactName" SortExpression="ContactName" /> <asp:TemplateField HeaderText="Phone" SortExpression="Phone"> <ItemTemplate> <asp:Label ID="Label1" runat="server" Text='<%# Eval("Phone") %>'></asp:Label> </ItemTemplate> <EditItemTemplate> <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Phone") %>'></asp:TextBox> </EditItemTemplate> </asp:TemplateField> <asp:BoundField DataField="Fax" HeaderText="Fax" SortExpression="Fax" /> </Columns> </asp:GridView>
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To support paging, all that is required is to set the AllowPaging property to TRue For sorting, you set the AllowSorting property to true, and then specify a SortExpression property for each of the bound columns Editing, deleting, and selecting are supported by adding a CommandField to the grid and setting theShowXXXButton properties to true for each of the kinds of command buttons you want to support Note also the use of a template column for the Phone column, and the use of theEval and Bind methods to set the data-binding expression
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