ASP.NET MVC 4 – for loop posts model collection properties but foreach does not

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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

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