ASP.NET WebForms: Is it possible to store/update session data within a thread in a load balanced enviroment using SQL server? -

ASP.NET WebForms: Is it possible to store/update session data within a thread in a load balanced enviroment using SQL server? -

we using asp.net webforms website load balancer storing session variables using sql server (for cannot alter configuration).

i need upload file , process can take time. give user feedback of current process.

i found solution start thread processing file. web method phone call returns straight unique guid identifying process. @ client phone call web method current status of process. thread updates process status stored in de session.

the problem doesn't works in load balanced environment session serialized sql server when initial process request called.

my question (i searched lot , not find exact answer):

is there way update session variable within thread re-serialized sql server?

asp.net sql multithreading session webforms