First of all, ASP.NET State Service is to be on to use StateServer Session.
Place this piece of code in your Web.Config File.
sessionState mode="StateServer" stateConnectionString="tcpip=127.0.0.1:42424" cookieless="false" timeout="120"
Now you can start using StateServer Session, rest of the steps are same all kind of Sessions.
However, if you are storing any Class’s Object in StateServer Session, this particular class requires Serialization. Have a look at this User Class, it’s object can be stored in StateServer Session. Continue reading