How to maintain session value in WCF?

See more:

WCF

I need to save data in session inside the WCF service in the first call and then use that data in further call of the service.

Basically what i need to do is call a method in WCF service while log in, this will get some data from database and will be placed in session say using the HttpContext, i see that this data is available in the same call util i return back to the client. But i need to have that data in session even for the next call to the service, will this be possible, please can you point me to some examples to achieve this.

What I have tried:

I have verified the Operation Context session id also, it is getting changed for each call.