how do I set username token for java web service in WCF

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WCF

Hello
I want to use a java web service fuction in a .net client program.
In .net 2 (by using WSE 3.0) I use this code to set the user name token and connect to web service

Service serviceProxy = new Service();
UsernameToken usernameToken = new UsernameToken("user", "password");
serviceProxy.SetClientCredential(usernameToken);
serviceProxy.SetPolicy("ClientPolicy");
serviceProxy.getTransactionByBillIdAndPayId(); 

that work OK in .net 2.0 and when I wanted to migrate to .net 4.0 using WCF I try this code to connect to the web service.

TransactionService.TransactionService proxy = new TransactionService.TransactionService();
String result = proxy.getTransactionByBillIdAndPayId(Convert.ToInt64(9916993302560), Convert.ToInt64(34530065));

the error "Invalid User Name Or Password" was occured when I run the code.
It seems that the username token was not set for the request.

the question is:
by which classes do I can send username token to the service?

regards
Reza Moghadas