Selecting multiple list items (set SelectionMode to Multiple) : ListBox « Data Binding « ASP.NET Tutorial

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">

    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        foreach (ListItem item in lstProducts.Items)
            if (item.Selected)
                lblProduct.Text += "<li>" + item.Text;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Multiple ListBox</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <asp:ListBox
        id="lstProducts"
        DataSourceID="srcProducts"
        DataTextField="Title"
        DataValueField="Id"
        SelectionMode="Multiple"
        Runat="server" />

    
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        OnClick="btnSubmit_Click"
        Runat="server" />
    

    <hr />

    <asp:Label
        id="lblProduct"
        EnableViewState="false"
        Runat="server" />

    <asp:SqlDataSource
        id="srcProducts"
        SelectCommand="SELECT Id, Title FROM Products"
        ConnectionString="<%$ ConnectionStrings:Products %>"
        Runat="server" />

    </div>
    </form>
</body>
</html>
        
            
File: Web.config

<configuration>
  <connectionStrings>
    <add name="Products" 
         connectionString="Data Source=.\SQLEXPRESS;
         AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
  </connectionStrings>
</configuration>

19.20.ListBox
	19.20.1.	Bind DataSet to ListBox
	19.20.2.	Show list items with programmatic binding.
	19.20.3.	ListBox Control data binding with asp:SqlDataSource
	19.20.4.	Selecting multiple list items (set SelectionMode to Multiple)