using (var factory = new ChannelFactory<ICalculator>("testEndpoint"))
            {
                try
                {
                    factory.Credentials.UserName.UserName = "testuser";
                    factory.Credentials.UserName.Password = "testpass";

                    var client = factory.CreateChannel();


                    var result = client.Add(1.5, 15.0);
                    Console.WriteLine($"\n1.5 + 15 = {result}");

                    ((IClientChannel)client).Close();
                    factory.Close();
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"Error {ex.Message}");
                }

            }