Add programatically noborder class to specific row to hide it
<style>
.noborder
{
border:none;
}
</style>
<table>
<tr>
<th>heading1</th>
<th>heading2</th>
</tr>
<tr>
<td>content1</td>
<td>content2</td>
</tr>
/*no border for this row */
<tr class="noborder">
<td>content1</td>
<td>content2</td>
</tr>
</table>