asp.net mvc - Pass html datalist value to Html.Action -

i'm creating html form lists line items 1 organization need mapped on. idea take id of selected option, , pass action via html.action. code have far;

<table class="table">     <tr>         <th>             @html.displaynamefor(model => model.newid)         </th>         <th>             @html.displaynamefor(model => model.oldserviceid)         </th>         <th>             @html.displaynamefor(model => model.description)         </th>         <th>             @html.displaynamefor(model => model.avg)         </th>         <th>             @html.displaynamefor(model => model.count)         </th>         <th>             @html.displaynamefor(model => model.acquisitionid)         </th>         <th></th>     </tr> @foreach (var item in model) {     <tr>         <td> @* i'm stuck *@             <form action=@html.action("update", new { linemappingid = @item.linemapid, newid = /*what goes here?*/ }) method="post" onsubmit="return updateform()" id="@item.linemapid">                 <input list="servicelist" name="servicelist">                 <datalist id="servicelist">                     @foreach (var serv in viewbag.servicelist)                     { @* pass id value here html.action *@                         <option value="@serv.serviceid - @serv.servicedesc" id="@serv.serviceid">@serv.serviceid - @serv.servicedesc</option>                     }                 </datalist>                 <input type="submit" value="update" />             </form>          </td>         <td>             @html.displayfor(modelitem => item.oldserviceid)         </td>         <td>             @html.displayfor(modelitem => item.description)         </td>         <td>             $@html.displayfor(modelitem => item.avg)         </td>         <td>             @html.displayfor(modelitem => item.count)         </td>         <td>             @html.displayfor(modelitem => item.acquisitionid)         </td>     </tr> } </table>