I want to move data with session using asp.net . I want to explain my question with scenario.
I have four layers in my application. When I login my portal with user password I create session for username and userid. for example,I have three servers for business layer that has load balance in front of each server.
How can i carry data(username/userid session) with this scenario. Or if you have a different way for carry data (without session) can you share ?(I added a picture for my scenario.) 
Note: I am only a software developer and I want to search best practice for this scenario.