css

    <style type="text/css">
        .alignTop {
            vertical-align:top;
        }
    </style>



                <td class="alignTop">
                    <asp:ListBox ID="ListBoxSpot" runat="server" SelectionMode="Multiple" Height="900px" Width="200px" OnSelectedIndexChanged="ListBoxSpot_SelectedIndexChanged1"  AutoPostBack="true"></asp:ListBox>
                </td>