This is how Visual Studio tells you that something went wrong while updating your entity.
Simple solution would be to catch System.Data.Entity.Validation.DbEntityValidationException and iterate through EntityValidationErrors collection.
try
{
return _context.SaveChanges();
}
catch (System.Data.Entity.Validation.DbEntityValidationException dbvEx)
{
List<string> errors = new List<string>();
foreach (var validationErrors in dbvEx.EntityValidationErrors)
{
foreach (var validationError in validationErrors.ValidationErrors)
{
errors.Add(string.Format("Property: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage));
}
}
return 0;
}
