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ASP.NET MVC Unobtrusive validation - why form context is needed?
@model MyViewModel
@{
    ViewContext.FormContext = new FormContext();
}

@Html.LabelFor(x => x.Foo)
@Html.EditorFor(x => x.Foo)
@Html.ValidationMessageFor(x => x.Foo)

success: function(result) {
    // we are replacing only a portion of the form
    $('#somePartOfTheForm').html(result);

    $('form').removeData('validator');
    $('form').removeData('unobtrusiveValidation');
    $.validator.unobtrusive.parse('form');
}