Integrating Validation with the Entity Framework: Listing 3.

Checking the Validate method for errors

Customer cust;
...retrieve Customer object...
cust.City = newCity;
cust.Address = newAddress;
...more property settings...

System.ComponentModel.DataAnnotations.IValidatableObject ivo = cust;
if (ivo.Validate(null).Count() > 0)
{
  foreach (System.ComponentModel.DataAnnotations.ValidationResult vr 
                             in ivo.Validate(null))
  {
    this.ErrorList.Items.Add(vr.ErrorMessage);
  }
}
else
{
  ne.SaveChanges();
}

About the Author

Peter Vogel is a system architect and principal in PH&V Information Services. PH&V provides full-stack consulting from UX design through object modeling to database design. Peter tweets about his VSM columns with the hashtag #vogelarticles. His blog posts on user experience design can be found at http://blog.learningtree.com/tag/ui/.

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