Bootstrap 3 + MVC 5 - validation css tips

1. the default MVC 5 site.css is missing some style for validation style on form-control. problem resolved after adding the missing css to site.css

/* styles for validation helpers */
.field-validation-error {
    color: #b94a48;
}

.field-validation-valid {
    display: none;
}

input.input-validation-error {
    border: 1px solid #b94a48;
}


select.input-validation-error {
border: 1px solid #b94a48;
}

input[type="checkbox"].input-validation-error {
    border: 0 none;
}

.validation-summary-errors {
    color: #b94a48;
}

.validation-summary-valid {
    display: none;
}

Reference - http://weblogs.asp.net/jdanforth/form-validation-formatting-in-asp-net-mvc-5-and-bootstrap-3

2. Use Html.ValidationSummary() to show custom mode state error: ModelState.AddModelError(string.Empty, "There is something wrong with Foo.");