BasicHttpBinding myBinding = new BasicHttpBinding();

myBinding.Name = "BasicHttpBinding_IAuthService";

myBinding.Security.Mode = BasicHttpSecurityMode.None;

myBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;

myBinding.Security.Transport.ProxyCredentialType = HttpProxyCredentialType.None;

myBinding.Security.Message.ClientCredentialType = BasicHttpMessageCredentialType.UserName; 

EndpointAddress endPointAddress = new EndpointAddress("http://xxxx/AuthService.svc");

AuthServiceClient client = new AuthServiceClient(myBinding, endPointAddress);

return client.CheckDateAuth(auth);