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Bind asp

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="CheckAndRadio.aspx.vb"  Inherits="CheckAndRadio" %> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Untitled Page</title> </head> <body>     <form id="form1" runat="server">     <div>         <asp:SqlDataSource               ID="SqlDataSource1"               runat="server"               ConnectionString="<%$ ConnectionStrings:ConnectionString %>"             SelectCommand="SELECT * FROM [Books]"></asp:SqlDataSource>          </div>         CheckBoxList:         <asp:CheckBoxList ID="CheckBoxList1"                            runat="server"                            DataSourceID="SqlDataSource1"                           DataTextField="Title"                            DataValueField="BookID">         </asp:CheckBoxList><br />         RadioButtonList:<br />         <asp:RadioButtonList ID="RadioButtonList1"                               runat="server"                               DataSourceID="SqlDataSource1"                              DataTextField="Title"                               DataValueField="BookID">         </asp:RadioButtonList><br />         <asp:Button ID="Button1" runat="server" Text="Click Me!" />         <br />         <asp:Label ID="results" runat="server"></asp:Label>     </form> </body> </html> File: CheckAndRadio.aspx.vb Partial Class CheckAndRadio     Inherits System.Web.UI.Page     Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click         results.Text = String.Empty         For Each li As ListItem In CheckBoxList1.Items             If li.Selected Then                 results.Text &= li.Text & "<br/>"             End If         Next         results.Text &= "<br/><br/><hr/>"         If RadioButtonList1.SelectedItem IsNot Nothing Then             results.Text &= RadioButtonList1.SelectedItem.Text         End If     End Sub End Class