维护来自android的WCF webservice调用之间的状态

I have a project in VB.NET which is using asp.net membership to manage user authentication. Now I want to build android app for this project so I decided to learn WCF and I have got average hold on WCF webservices. Now the issue I am facing is that when the user login into the android app following things happen:I have a project in VB.NET which is using asp.n