jQuery and ASP.NEt MVC validation: Prevent validation on server - jquery-validate

Question

I have model that looks like this:
public class Lesson
{
public int Id { get; set; }
[Required(ErrorMessage = "Naam voor de les is verplicht")]
[Display(Name="Naam")]
public string Name { get; set; }
[Required(ErrorMessage = "Tijd is verplicht")]
[Display(Name="Tijd")]
public string Time { get; set; }
//Prijs is default exclusief BTW
[Required(ErrorMessage = "Prijs is verplicht")]
[Display(Name="Prijs (excl btw)")]
public double Price { get; set; }
[Display(Name = "Maximum aantal leerlingen")]
public int MaxStudents { get; set; }
}
And a create view that looks like this:
<div>
<div>
#Html.LabelFor(model => model.Name)
</div>
<div>
#Html.TextBoxFor(model => model.Name, new { #class = "gt-form-text" })
#Html.ValidationMessageFor(model => model.Name)
</div>
<div>
#Html.LabelFor(model => model.Time)
</div>
<div>
#Html.TextBoxFor(model => model.Time, new { #class = "gt-form-text" })
#Html.ValidationMessageFor(model => model.Time)
</div>
<div>
#Html.LabelFor(model => model.Price)
</div>
<div>
#Html.TextBoxFor(model => model.Price, new { #class = "gt-form-text" })
#Html.ValidationMessageFor(model => model.Price)
</div>
<div>
#Html.LabelFor(model => model.MaxStudents)
</div>
<div>
#Html.TextBoxFor(model => model.MaxStudents,
new { #class = "gt-form-text" })
#Html.ValidationMessageFor(model => model.MaxStudents)
</div>
</div>
In the Application_Start() method I set DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes to false.
MaxStudents is nullable and not required, nevertheless, if MaxStudents is null, the Modelstate is not valid (ModelState.IsValid = false).
My errormessage is not shown, instead of that I get the errormessage is A value is required.
What can I do to get ModelState.IsValid to be true?

Answer 1

Someone shared this with me, and I'll pass it on in case it helps. Sometimes those validation errors get swallowed up and are hard to find. When I was having a similar issue, I added this code to my ActionResult (HttpPost) and it got me right to the error in question.
try
{
db.Entry(myModel).State = EntityState.Modified;
db.SaveChanges();
}
catch (DbEntityValidationException dbEx)
{
foreach (var validationErrors in dbEx.EntityValidationErrors)
{
foreach (var validationError in validationErrors.ValidationErrors)
{
Trace.TraceInformation("Property: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage);
}
}
} // }