public static bool DeleteUserGroup(UserGroup userGroup, AriUMContext ctx)
 {
     ctx.Delete(userGroup);
     ctx.SaveChanges();
     return true;
 }
 public static bool DeleteUser(User user, AriUMContext ctx)
 {
     ctx.Delete(user);
     ctx.SaveChanges();
     return true;
 }
 public static bool DeleteInvoiceLine(InvoiceLine invoiceLine, AriUMContext ctx)
 {
     ctx.Delete(invoiceLine);
     ctx.SaveChanges();
     return true;
 }
 public static bool DeleteProduct(Product product, AriUMContext ctx)
 {
     ctx.Delete(product);
     ctx.SaveChanges();
     return true;
 }
 public static bool DeleteCustomer(Customer customer, AriUMContext ctx)
 {
     ctx.Delete(customer);
     ctx.SaveChanges();
     return true;
 }