How to use ASP.Net Session in WCF service

hi,

if you want to access the asp.net session from WCF, first of all you have to enable session state in WFC application by adding ASP.net  Compatibility mode in web config.

Please refer for more details....
http://my.safaribooksonline.com/book/programming/microsoft-dotnet/9781849685924/1dot-building-odata-services/id286751832
http://blogs.msdn.com/b/wenlong/archive/2010/02/21/using-asp-net-sessions-from-wcf.aspx

hope this will help you.