ASP.NET Session State

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ASP.NET session state supports several different storage options for session data. Each option is identified by a value in the Session StateMode enumeration. The following list describes the available session state modes




In-Process Mode:
In-process mode is the default session state mode and is specified using the InProc SessionStateMode enumeration value. In-process mode stores session state values and variables in memory on the local Web server. It is the only mode that supports the Session_OnEnd event. For more information about the Session_OnEnd event.

StateServer mode:
 Stores session state in a process, referred to as the ASP.NET state service, that is separate from the ASP.NET worker process or IIS application pool. Using this mode ensures that session state is preserved if the Web application is restarted and also makes session state available to multiple Web servers in a Web farm.To use StateServer mode, you must first be sure the ASP.NET state service is running on the server used for the session store. The ASP.NET state service is installed as a service when ASP.NET and the .NET Framework are installed.The ASP.Net state service is installed at the following location

systemroot\Microsoft.NET\Framework\versionNumber\aspnet_state.exe


Set the mode attribute of the sessionState element to StateServer.

Set the stateConnectionString attribute to tcpip=serverName:42424.

<configuration>
  <system.web>
    <sessionState mode="StateServer"
      stateConnectionString="tcpip=SampleStateServer:42424"
      cookieless="false"
      timeout="20"/>
  </system.web>
</configuration>

SQL Server:
SQLServer mode stores session state in a SQL Server database. Using this mode ensures that session state is preserved if the Web application is restarted and also makes session state available to multiple Web servers in a Web farm.

<configuration>
  <system.web>
    <sessionState mode="SQLServer"
      sqlConnectionString="Integrated Security=SSPI;data
        source=SampleSqlServer;" />
  </system.web>
</configuration>


ASPState-DB
[ASPStateTempSessions]
[ASPStateTempApplications]

Custom mode:
Custom mode specifies that you want to store session state data using a custom session state store provider. When you configure your ASP.NET application with a Mode of Custom, you must specify the type of the session state store provider using the providers sub-element of the sessionState configuration element. You specify the provider type using an add sub-element and include both a type attribute that specifies the provider's type name and a name attribute that specifies the provider instance name. The name of the provider instance is then supplied to the customProvider attribute of the sessionState element to configure ASP.NET session state to use that provider instance for storing and retrieving session data

<configuration>
  <connectionStrings>
    <add name="OdbcSessionServices"
      connectionString="DSN=SessionState;" />
  </connectionStrings>

  <system.web>
    <sessionState
      mode="Custom"
      customProvider="OdbcSessionProvider">
      <providers>
        <add name="OdbcSessionProvider"
          type="Samples.AspNet.Session.OdbcSessionStateStore"
          connectionStringName="OdbcSessionServices"
          writeExceptionsToEventLog="false" />
      </providers>
    </sessionState>
  </system.web>
</configuration>


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