This enumeration allows you to identify the type of ASP.NET session
storage by using the HttpSessionState.Mode
property. It also allows you to specify it by using the
mode attribute of the
<sessionState> tag in the
web.config file (for example,
<sessionState mode="SQLServer">).
Session state can be stored locally in the ASP.NET process
(InProc, the method used in traditional ASP
applications), in a separate server (StateServer),
or serialized to a temporary table in an SQL Server database
(SQLServer), which the ASP.NET worker processes
access and manage automatically. Note that both
StateServer and SQLServer
methods allow state to be shared across servers in web farm/web
garden scenarios and retained in the case of a server restart.
public enum SessionStateMode {
Off = 0,
InProc = 1,
StateServer = 2,
SQLServer = 3
}
System.ValueType 
