Details explanation on Compression Enabled Session for SQL Server and State Sever Session Mode in ASP.NET 4.0

While we are talking about state management we consider Session is one of  most useful server side  state management mechanism for a web application.  In ASP.NET mainly we are having two type of state management  1. In Process  and 2. Out Process . In process is the by default session imagestorage mode for ASP.NET Web application and this is taken care by worker process in IIS. When it comes under Out Process we can use either of state server or SQL Server to persist session data. In case of In Process, session data stored in In memory of worker process. But when we are talking about OutProc session mode, we need to ensure that session data should be Serializedfirst . So, when we are moving session data from Web Server to Out Process Server ( State Server or SQL Server ) it can be a performance overhead based on the size of data that we are storing in Session.

ASP.NET 4.0 comes with a new option for compressing the Session data with Out Process Session mode. To enabling this functionality we need to add “compressionEnabled=”true” attribute with the SessionMode in web.config .