<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <link href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css"
        rel="stylesheet" type="text/css" />
    <script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>
    <link href="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/css/bootstrap-multiselect.css"
        rel="stylesheet" type="text/css" />
    <script src="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/js/bootstrap-multiselect.js"
        type="text/javascript"></script>
    <script type="text/javascript">
        $(function() {
            $('[id*=lstFruits]').multiselect({
                includeSelectAllOption: true
            });
        });
    </script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
 <asp:ListBox ID="lstFruits" runat="server" SelectionMode="Multiple">
        <asp:ListItem Text="Mango" Value="1" />
        <asp:ListItem Text="Apple" Value="2" />
        <asp:ListItem Text="Banana" Value="3" />
        <asp:ListItem Text="Guava" Value="4" />
        <asp:ListItem Text="Orange" Value="5" />
    </asp:ListBox>
    <asp:Button ID="Button1" Text="Submit" runat="server" OnClick="Submit" />

</asp:Content>

protected void Submit(object sender, EventArgs e)
    {
        string message = "";
        foreach (ListItem item in lstFruits.Items)
        {
            if (item.Selected)
            {
                message += item.Text + " " + item.Value + "\n";
            }
        }
        ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('" + message + "');", true);
    }