In ASP.net cookieless sessions are supported and sessionstate in ASP.net can be configured through web.config. In ASP.net sessions can be configured in three ways.

1. In-Proc (In Process)
2. State Server (Out Process)
3. SQL Server(Database)

1. In-Proc : In this mode the sessions are stored in the memory of the ASP.NET worker process. Thus, this mode offers the fastest access to stored session values. However, when the ASP.NET worker process recycles, the session data is lost.

2. State Server: It is accomplished by setting the sessionstate mode in web.config to StateServer. In this mode the session data is stored in a separate in memeory cache which is controlled by window service on a separate machine. The state service called asp.net state service (aspnet_state.exe) is configured using stateconnectionstring attribute in the web.config file. e.g.