how to remove space under a table? - asp.net

Question

Here what I've done and whats my problem. First of all i got a big table with a lot of td the first td on top of my table containt anoter table and (here come my problem) theres a space under that little table and I don't know why.
Here's the code for my table:
<div runat="server" class="ReportPage" >
<table runat="server" class="ListReportBigTable" align="center">
<tr>
<td class="style13" colspan="3" >
<table width="46%" align="center"style="height:50%; "cellpadding="0">
<tr>
<td align="left">
<asp:Label ID="LB_ChooseReport" runat="server"
Text="Choisissez un dossier médical: " Font-Size="Small">
</asp:Label>
</td>
</tr>
<tr>
<td style="vertical-align:bottom" align="left">
<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<div id="div_Filter" runat="server" visible="false" align="left">
<asp:Label ID="LBL_FilteredBy" runat="server" width="18%" Text="Patient : "
Font-Size="Small" style="margin-left: 0px"></asp:Label>
<asp:DropDownList ID="DDL_FilterSelect" runat="server" AutoPostBack="true"
Width="25%" CssClass="DDL_Filter" Font-Size="Small" Height="18px"></asp:DropDownList>
</div>
</ContentTemplate>
</asp:UpdatePanel></td></tr></table>
<br />
</td>
and here the CSS:
.ListReportBigTable
{
height:25%;
width:55%;
text-align:center;
vertical-align:middle;
border: thick solid black;
margin-left: 0px;
}
thx in advance

Answer 1

I don't know if it's a typo but you are closing with a </td> after your closing </table> tag. In addition you have a <br /> before the closing misplaced </td> which would obviously add space to the bottom.
Try changing the closing </td> to </table></div> and removing the <br />
In addition, in your CSS try adding margin-bottom: 0px; and padding-bottom: 0px; to see if this has an effect.
Also, what is after the table? Maybe whatever is being displayed after the table has it's own top margin/padding?
Do you have a link to the actual page where this is occuring so we can examine with Firebug or similar and try to figure it out?