How Can ASP.NET Session State Service Enable Cross-Application Session Sharing?

Sharing sessions across applications: Leveraging ASP.NET Session State Services

Introduction

Web applications often need to share session data between multiple applications, allowing users to seamlessly access their information and preferences. This article explores how to leverage the ASP.NET session state service to achieve session sharing between two different web applications hosted on the same server.

Share sessions between .NET 2.0 and MVC2 applications

The initial attempt to share a session between a .NET 2.0 Web Forms application and a .NET 3.5 MVC2 application was to publish the session key from the Web Forms application to the MVC application. However, this approach suffers from a problem that the session cannot be loaded in the MVC application.

Solution: Use SQL Server’s native session state and shared machine keys

To overcome this challenge, both applications should use native .NET session state stored in SQL Server. Additionally, a shared machine key is used to ensure that applications can consistently encrypt and decrypt session data.

Web.config configuration

In both applications’ web.config files, configure session state as follows:

<sessionstate mode="SQLServer" sqlconnectionstring="..."></sessionstate>
<machinekey decryption="AES" validation="SHA1" validationkey="SOMEKEY"></machinekey>

Database configuration

Create the necessary session state database on a SQL Server instance accessible to both applications. Run the aspnet_regsql.exe command to initialize the database.

Modify stored procedure

Made minor modifications to the TempGetAppID stored procedure in the session state database:

SET @appName = LOWER(@appName)

Results

By using native session state stored in SQL Server and sharing machine keys, both applications can access the same session data. This enables seamless sharing of session information between applications.

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