...     
<ul>
        <table>  
    <tbody id ="tabledata1">
        @Html.Action("ContragentList")
        </tbody>
    </table>
            </ul>
         <div id ="loading"><p>ld</p></div>
     @using (Ajax.BeginForm(ajaxOpts))
{ 
        <tbody id ="tabledata2">
        @Html.Action("ContragentData")
        </tbody>
         }
...

...

@foreach (Contragent appt in Model)
{ 
<tr>
    <td>@Ajax.ActionLink(appt.name, "ContragentData", new { CID = appt.contragenrtId },
    new AjaxOptions {
    UpdateTargetId="tabledata2",
    LoadingElementId="loading",
    })
      
        
      </td>
    </tr>
}
...