will re-assigning session variable prevent session expiring?

will re-assigning session variable prevent session expiring?

I am developing a asp.net web application. I am making use of Session
variable to store user id and user name. Session variables tend to expire
after some time, which we can configure in web.config. To avoid session
variable from getting expired is it good if we re assign the session
variable to itself every 5-10 minutes!?
in the client side if we have a settimeout or setinterval and make a ajax
call to assign the session variable to itself every five minutes, will
this prevent session expiring!?
I want to do this to make sure that no error arises because of session
expiring.