// Create transport binding
BasicHttpBinding binding = new BasicHttpBinding(BasicHttpSecurityMode.TransportWithMessageCredential);
binding.Security.Message.ClientCredentialType = BasicHttpMessageCredentialType.UserName;

// Create client
MySyncPortClient _service = new MySyncPortClient(binding, new EndpointAddress("https://path/to/service"));
_service.ClientCredentials.UserName.UserName = "foo";
_service.ClientCredentials.UserName.Password = "bar";

// Set custom bindings
BindingElementCollection elements = _service.Endpoint.Binding.CreateBindingElements();
elements.Find<SecurityBindingElement>().IncludeTimestamp = false;
_service.Endpoint.Binding = new CustomBinding(elements);

// Perform a request
_service.DoSomething();