Knockout foreach error

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MVC

Knockout.js

iam getting error Mobjlineitem not defined

<tbody data-bind="foreach: MobjLineitems">
                       <tr>
                           <td>
                               <input data-bind="@Html.DataBinding(m => m.MobjLineitems, it => it.MobjLineitem.productid)" type="text" value="" />
                           </td>
                           <td class="number">
                               <input data-bind="@Html.DataBinding(m => m.MobjLineitems, it => it.MobjLineitem.rate)" type="text" value="" class="number pure-input-2-3" />
                           </td>
                           <td class="number">
                               <input data-bind="@Html.DataBinding(m => m.MobjLineitems, it => it.MobjLineitem.quantity)" type="text" value="" class="number pure-input-2-3" />
                           </td>
                           <td class="number">
                               <input data-bind="value: Value" readonly="readonly" type="text" value="" class="number pure-input-2-3" />
                           </td>
                           <td>

                               <input type="button" class="pure-button" data-bind="click: $parent.delItem" value="delete"/>

                           </td>
                       </tr>
                   </tbody>

Iam using helper as below

public static string DataBinding<TModel, U, V>(this HtmlHelper<TModel> helper, Expression<Func<TModel, IEnumerable>> listExpr,
          Expression<Func<U, V>> memberExpr)
        {
            var meta = ModelMetadata.FromLambdaExpression(listExpr, helper.ViewData);
            var listName = meta.PropertyName;

            string itemName = GetFullPropertyName(memberExpr);

            return string.Format("value: {1}, attr: {{ id : '{0}_' + $index() + '__{1}', name: '{0}[' + $index() + '].{1}' }}",listName, itemName);
        }

itemName is having value Mobjlineitem.productid

when its just productid there is no error

Any solution?