public void SetPrimaryContact() { Client client = new Client(auth, clientId); try { client.SetPrimaryContact("*****@*****.**"); } catch (CreatesendException ex) { ErrorResult error = (ErrorResult)ex.Data["ErrorResult"]; Console.WriteLine(error.Code); Console.WriteLine(error.Message); } catch (Exception ex) { // Handle some other failure Console.WriteLine(ex.ToString()); } }