WCF / ASMX :: Unable To See Result Set - Always Null

iam using webservice for create customer.by using WSDL(webservice) Url iam able to create customer Successsfully using Createcustomer request class. but in responce iam unable to get Unique ID the reponce object should generate as per SOAP functioanly iam unable to see the result set it is always null. How can i do this i need to capture that Unique ID after creating customer. it's Async mode. In below responce e.result set containning NULL values evn i customercreated in database.how to get my UniqueId in responce. my code:

{
Customer customer = new Customer();
PersonName pn = new PersonName();
pn.FirstName = txtFname.Text;
pn.LastName = txtLname.Text;
pn.MiddleName = txtMname.Text;
pn.Salutation = "Mr.";
customer.PersonName = pn;
CreateCustomerRequest ccr = new CreateCustomerRequest();
ccr.CreateCustomer = customer;
RSWS rsws = new RSWS();
rsws.CreateCustomerCompleted += new CreateCustomerCompletedEventHandler(rsws_CreateCustomerCompleted);
rsws.CreateCustomerAsync(ccr);
}
void rsws_CreateCustomerCompleted(object sender, CreateCustomerCompletedEventArgs e)
{
CreateCustomerResponse ccresp = e.Result;
Page.RegisterStartupScript("inspa", "<script>alert('customer created successfully')</script>");
}