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Using a FormView control to display and edit data

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Untitled Page</title> </head> <body>     <form id="form1" runat="server">     <div>         <asp:FormView ID="FormView1" Runat="server" DataSourceID="SqlDataSource1"              DataKeyNames="CustomerID" AllowPaging="True">             <EditItemTemplate>                 CustomerID:                 <asp:Label Text='<%# Eval("CustomerID") %>' Runat="server"                      ID="CustomerIDLabel1">                 </asp:Label><br />                 CompanyName:                 <asp:TextBox Text='<%# Bind("CompanyName") %>' Runat="server"                      ID="CompanyNameTextBox"></asp:TextBox><br />                 ContactName:                 <asp:TextBox Text='<%# Bind("ContactName") %>' Runat="server"                      ID="ContactNameTextBox"></asp:TextBox><br />                 ContactTitle:                 <asp:TextBox Text='<%# Bind("ContactTitle") %>' Runat="server"                     ID="ContactTitleTextBox"></asp:TextBox><br />                 Address:                 <asp:TextBox Text='<%# Bind("Address") %>' Runat="server"                      ID="AddressTextBox"></asp:TextBox><br />                 City:                 <asp:TextBox Text='<%# Bind("City") %>' Runat="server"                      ID="CityTextBox"></asp:TextBox><br />                 Region:                 <asp:TextBox Text='<%# Bind("Region") %>' Runat="server"                      ID="RegionTextBox"></asp:TextBox><br />                 PostalCode:                 <asp:TextBox Text='<%# Bind("PostalCode") %>' Runat="server"                      ID="PostalCodeTextBox"></asp:TextBox><br />                 Country:                 <asp:TextBox Text='<%# Bind("Country") %>' Runat="server"                      ID="CountryTextBox"></asp:TextBox><br />                 Phone:                 <asp:TextBox Text='<%# Bind("Phone") %>' Runat="server"                      ID="PhoneTextBox"></asp:TextBox><br />                 Fax:                 <asp:TextBox Text='<%# Bind("Fax") %>' Runat="server"                      ID="FaxTextBox"></asp:TextBox><br />                 <br />                 <asp:Button ID="Button2" Runat="server" Text="Update"                      CommandName="update" />                 <asp:Button ID="Button3" Runat="server" Text="Cancel"                      CommandName="cancel" />             </EditItemTemplate>             <ItemTemplate>               CustomerID:<asp:Label ID="CustomerIDLabel" Runat="server"                                  Text='<%# Bind("CustomerID") %>'>                                  </asp:Label>               CompanyName:<asp:Label ID="CompanyNameLabel" Runat="server"                                  Text='<%# Bind("CompanyName") %>'>                                  </asp:Label>               ContactName:<asp:Label ID="ContactNameLabel" Runat="server"                                  Text='<%# Bind("ContactName") %>'>                                  </asp:Label><br />               ContactTitle:<asp:Label ID="ContactTitleLabel" Runat="server"                                  Text='<%# Bind("ContactTitle") %>'>                                  </asp:Label><br />                <asp:Label ID="AddressLabel" Runat="server"                                              Text='<%# Bind("Address") %>'>                                              </asp:Label></td>                <asp:Label ID="CityLabel" Runat="server"                                              Text='<%# Bind("City") %>'>                                              </asp:Label></td>                <asp:Label ID="RegionLabel" Runat="server"                                              Text='<%# Bind("Region") %>'>                                              </asp:Label></td>                <asp:Label ID="PostalCodeLabel"                                             Runat="server"                                              Text='<%# Bind("PostalCode") %>'>                                             </asp:Label>                <asp:Label ID="CountryLabel" Runat="server"                                              Text='<%# Bind("Country") %>'>                                              </asp:Label></td>                Phone:<asp:Label ID="PhoneLabel" Runat="server"                                                     Text='<%# Bind("Phone") %>'>                                                    </asp:Label><br />                Fax:<asp:Label ID="FaxLabel" Runat="server"                                              Text='<%# Bind("Fax") %>'>                                              </asp:Label><br />                <asp:Button ID="Button1" Runat="server"                                  Text="Edit" CommandName="edit" />             </ItemTemplate>         </asp:FormView>         <asp:SqlDataSource ID="SqlDataSource1" Runat="server"               SelectCommand="SELECT * FROM [Customers]"              ConnectionString="<%$ ConnectionStrings:AppConnectionString1 %>">         </asp:SqlDataSource>          </div>     </form> </body> </html> File: Web.config <configuration>   <appSettings/>   <connectionStrings>         <add name="AppConnectionString1"               connectionString="Data Source=localhost\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=True"              providerName="System.Data.SqlClient" />     </connectionStrings>   <system.web>     <compilation debug="true" strict="false" explicit="true">       <codeSubDirectories>         <add directoryName="VB"></add>         <add directoryName="CS"></add>       </codeSubDirectories>     </compilation>     <pages>       <namespaces>         <clear/>         <add namespace="System"/>         <add namespace="System.Collections"/>         <add namespace="System.Collections.Specialized"/>         <add namespace="System.Configuration"/>         <add namespace="System.Text"/>         <add namespace="System.Text.RegularExpressions"/>         <add namespace="System.Web"/>         <add namespace="System.Web.Caching"/>         <add namespace="System.Web.SessionState"/>         <add namespace="System.Web.Security"/>         <add namespace="System.Web.Profile"/>         <add namespace="System.Web.UI"/>         <add namespace="System.Web.UI.WebControls"/>         <add namespace="System.Web.UI.WebControls.WebParts"/>         <add namespace="System.Web.UI.HtmlControls"/>       </namespaces>     </pages>     <authentication mode="Windows"></authentication>     <identity impersonate="true"/>   </system.web> </configuration>