How to catch Non-integer values mapped to integer properties in UpdateModel()

Let's say you have an object called Person that looks like this:

class Person
{
  public int ID { get; set; }
  public string Name { get; set; }
  public int NumberOfCatsNamedEnder { get; set; }
}

I have a simple HTML form that exposes the properties that gets posted to an ASP.NET MVC action inside of my PersonController class. The issue I have is that if someone puts in the letter 'A' for NumberOfCatsNamedEnder, I get a The model of type 'Person' was not successfully updated. error. Since this happens while trying to update the Model, I can't find any way to check to see if someone passed in a non-integer value without resorting to

if(!IsInteger(formCollection["NumberOfCatsNamedEnder"]))
{
  ModelState.AddModelError(
    "NumberOfCatsNamedEnder",
    "Ender count should be a number");
}

Is there a better way to do this? I was able to find some information on custom ModelBinders; is that what is needed?

From stackoverflow

• I really like the approach of using a presentation model. I'd create a class like this:

  class PersonPresentation
  {
      public int ID { get; set; }
      public string Name { get; set; }
      public string NumberOfCatsNamedEnder { get; set; }
  
      public void FromPerson(Person person){ /*Load data from person*/ }
  }
  

  Then your controller action can bind the view to a PersonPresentation:

  public ActionResult Index()
  {
      Person person = GetPerson();
      PersonPresentation presentation = new PersonPresentation();
      ViewData.Model = presentation.FromPerson(person);
      return View();
  }
  

  ...and then accept one in your Update method and perform validation:

  public ActionResult Update(PersonPresentation presentation)
  {
      if(!IsInteger(presentation.NumberOfCatsNamedEnder))
      {
          ModelState.AddModelError(
            "NumberOfCatsNamedEnder",
            "Ender count should be a number");
      }
      ...
  }