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Using the ListBox control (C#)

<%@ Page Language="C#" %> <script runat="server">     protected void Button1_Click(object sender, EventArgs e)     {        ListBox1.Items.Add(TextBox1.Text.ToString());     }     protected void Button2_Click(object sender, EventArgs e)     {        Label1.Text = "You selected from the ListBox:<br>";        foreach (ListItem li in ListBox1.Items) {            if (li.Selected == true) {                Label1.Text += li.Text + "<br>";            }        }        } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">     <title>Using the ListBox</title> </head> <body>     <form id="form1" runat="server">     <div>         <asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>         <asp:Button ID="Button1" Runat="server" Text="Add an additional item"           OnClick="Button1_Click" />         <br />              <asp:ListBox ID="ListBox1" Runat="server" SelectionMode="multiple">            <asp:ListItem>Hematite</asp:ListItem>            <asp:ListItem>Halite</asp:ListItem>            <asp:ListItem>Limonite</asp:ListItem>            <asp:ListItem>Magnetite</asp:ListItem>         </asp:ListBox>         <br />         <asp:Button ID="Button2" Runat="server" Text="Submit"           OnClick="Button2_Click" />         <br />         <asp:Label ID="Label1" Runat="server"></asp:Label>     </div>     </form> </body> </html>