= Join(Parameters!MyParamName.Value, ",")

<table>
  <tr>
    <td>Name1</td>
    <td>11</td>
    <td>12</td>
  </tr>
  <tr>
    <td>Name2</td>
    <td>21</td>
    <td>22</td>
  </tr>
  <tr>
    <td> </td>
    <td>31</td>
    <td>32</td>
  </tr>
</table>

use ReportServer

select cast(convert(varchar(max), cast(Content as varbinary(max))) as xml) [Content], cast(Parameter as xml) [Parameter]
from [Catalog]
where Content is not null