ASP.NET MVC 4 - for loop posts model collection properties but foreach does not
Solution 1:
the problem is not with the IEnumerable or the IList it the way you are rendering the collection in your view.
@for(var i = 0;i < Model.People.Count;i++)
{
<tr>
<td>@Html.TextBoxFor(m => Model.People[i].Name)</td>
<td>@Html.TextBoxFor(m => Model.People[i].Age)</td>
</tr>
}
Observe that with each list item you are appending a continuous index which enables the model binder to do its magic
A good read