formcollection for a single row in asp.net mvc

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MVC

@using (Html.BeginForm("Assign", "Users"))
 {
<table>
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.GroupId)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.OfficeNameAr)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.OfficeNamrEn)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.DIRCODE)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.FinanceAccountNo)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.City.CityNameAr)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model)
{
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.GroupId)
           @Html.HiddenFor(modelItem => item.GroupId)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.OfficeNameAr)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.OfficeNamrEn)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.DIRCODE)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.FinanceAccountNo)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.City.CityNameAr)
        </td>
       
        <td>
            @Html.DropDownList("RightId", ViewBag.rights as SelectList)
        </td>
        <td>
        
              @*@Ajax.ActionLink("Assign", "Assign", new { groupid = item.GroupId }, new AjaxOptions { HttpMethod = "POST" })*@
            <input type="submit" name="Assign" />
        </td>

    </tr>
}


</table>
 }

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")

when i click a button it goes to the assign action in users controller, and am getting the values in formcollection object. The issue is when i click a button the group id values are becomes comma deletemeted strings, instead i just want to retreive only one row of where the button was actually clicked.

Hope you can understand and expecting the replies