How to change binding properties(custom binding)

Uri baseAddress = new Uri("https://localhost:8081/testsvc");

ServiceHost sh = new ServiceHost(typeof(CalculatorService), baseAddress);

WSDualHttpBinding b = new WSDualHttpBinding();

BindingElementCollection bec = b.CreateBindingElements();

TextMessageEncodingBindingElement sbe = bec.Find<TextMessageEncodingBindingElement>();

sbe.MessageVersion = MessageVersion.Soap11WSAddressingAugust2004;

CustomBinding cb = new CustomBinding(bec);

sh.AddServiceEndpoint("WCFSAMPLES.ICalculatorDuplex", cb, "");

sh.Open();

Console.WriteLine("service is ready");

Console.ReadKey();

 

SvcUtil.exe.config