public override Boolean IsValid(Object value)
{
Type objectType = value.GetType();
PropertyInfo piUser = objectType.GetProperties()
.Where(p => p.Name == UserIdField)
.FirstOrDefault();
PropertyInfo piEmail = objectType.GetProperties()
.Where(p => p.Name == EmailField)
.FirstOrDefault();
if (piUser == null || piEmail == null)
{
throw new ApplicationException("UniqueUserEmailAttribute error on " + objectType.Name);
}
int uid = Convert.ToInt32(piUser.GetValue(value, null));
string email = Convert.ToString(piEmail.GetValue(value, null));
UserService service = new UserService();
return service.IsAvailableEmail(uid, email);
}