passing object to web methods as out parameter?

Dear Friends,
i have one web service and some methods with objects parameter of some custom class. like this

[WebMethod]
    public void Createactivity(User objUser,Result objResult)
{
 objResult..IsSuccess = True;
}
in client appplication:

client application need to  create objects of User and Result  class and call
Createactivity(User objUser,Result objResult) our web service methods . like this
 WebService objMember = new  WebService();
   Result objResult = new  Result();
        User objUser = new User();
objResult.IsSuccess = false;

objMember.Createactivity(objUser,  objResult); 
 Response.Write(objWSIResult.IsSuccess);

this is my coding but the isssue is the output is false that means
objResult.IsSuccess is false
the obj ...