private void AgregarComision(Commission comision)
{
if (ExisteComision(comision))
throw new ArgumentException("Comision ya existe");
db.Commissions.Add(comision);
}
public bool ExisteComision(Commission comision)
{
if (comision == null)
return false;
return (db.Commissions.SingleOrDefault(c => c.ID == comision.ID ||
c.Name == comision.Name) != null);
}