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DPC：Creating a DataBound List of Radio Buttons--预览页面source code[等级：中]

作者： unknow

<% @Import Namespace="System.Data" %> 
<% @Import Namespace="System.Data.SqlClient" %> 
<script language="vb" runat="server"> 
  Sub Page_Load(sender as Object, e as EventArgs) 
    If Not Page.IsPostBack then 
      BindData() 
    End If   
  End Sub 
 
   
  Sub BindData() 
    @#1. Create a connection 
    Dim myConnection as New SqlConnection(ConfigurationSettings.AppSettings("connectionString")) 
 
    @#2. Create the command object, passing in the SQL string 
        Const strSQL as String = "SELECT PublisherID, Name FROM tblPublishers ORDER BY Name" 
        Dim myCommand as New SqlCommand(strSQL, myConnection) 
 
    myConnection.Open() 
 
    radlstPubs.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection) 
    radlstPubs.DataBind()   
 
  End Sub 
 
 
 
  Sub btnViewBooks_Click(sender as Object, e as EventArgs) 
    @#If the user has not selected an item from the radiobuttonlist, 
    @#do nothing 
    If radlstPubs.SelectedItem Is Nothing then Exit Sub 
     
    @#1. Create a connection 
    Dim myConnection as New SqlConnection(ConfigurationSettings.AppSettings("connectionString")) 
 
    @#2. Create the command object, passing in the SQL string 
        Dim strSQL as String = "SELECT Title, Description FROM tblBooks " & _ 
                " WHERE PublisherID = " & radlstPubs.SelectedItem.Value & _ 
                " ORDER BY Title" 
        Dim myCommand as New SqlCommand(strSQL, myConnection) 
 
    myConnection.Open() 
 
    dgBooks.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection) 
    dgBooks.DataBind()   
     
    lblTitle.Text = "Books Published by " & radlstPubs.SelectedItem.Text 
  End Sub 
</script> 
 
<html> 
<body> 
 
  <h1>Radio Button List Demo</h1> 
  This demo illustrates how to use data-binding to dynamically 
  create a radio button list based on database information. 
  The data below is from the 
  <a href="http://www.4guysfromrolla.com/webtech/chapters/">Sample Chapters Database</a>. 
  First, the radio button list is bound to the <code>tblPublishers</code> table.  Then, 
  when you select a publisher, a DataGrid Web control is populated with 
  the books provided by the selected publisher.  (Adding paging to the DataGrid would be 
  a snap.  Just read: <a href="http://www.4guysfromrolla.com/webtech/072101-1.shtml">Paing 
  Database Results in ASP.NET</a>!) 
  <hr> 
 
  <form runat="server"> 
     
    Choose a Publisher@#s Books to View 
    <asp:radiobuttonlist id="radlstPubs" runat="server" Font-Name="Verdana" 
            DataValueField="PublisherID" DataTextField="Name" /> 
     
    <asp:button id="btnViewBooks" runat="server" Font-Name="Verdana" 
          Text="View Published Books" OnClick="btnViewBooks_Click" /> 
     
     
    <asp:label id="lblTitle" runat="server" Font-Name="Verdana" 
          Font-Size="Large" Font-Bold="True" /> 
    <asp:datagrid id="dgBooks" runat="server" 
      Font-Name="Verdana" Font-Size="Smaller" 
      HeaderStyle-BackColor="Purple" HeaderStyle-ForeColor="White" 
      HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="True" 
      AutoGenerateColumns="False"> 
     
      <Columns> 
       
        <asp:BoundColumn HeaderText="Book Title" HeaderStyle-HorizontalAlign="Center" 
                DataField="Title" /> 
        <asp:BoundColumn HeaderText="Synopsis" HeaderStyle-HorizontalAlign="Center" 
                DataField="Description" /> 
      </Columns> 
    </asp:datagrid> 
     
  </form>

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