A portal application

Hi I have two sql server instances, one is normal and the other is backup mode that is the replication of the normal.

I have a portal in the web site. For a specific group in database and users in AD can login in backup mode. For others, they can login normal one.
Now I am using configuration file to swith the connection strings manully.

How to do it automatelly with code?
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I would assume you have some way to detect which user they are. If that is the case:

<add name="LiveDBConnection" connectionString="MyLiveConnection"/>
<add name="BackupDBConnection" connectionString="MyBackupConnection"/>

    connection.ConnectionString = ConfigurationManager.ConnectionStrings["BackupDBConnection"].ConnectionString
    connection.ConnectionString = ConfigurationManager.ConnectionStrings["MyLiveConnection"].ConnectionString

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Microsoft SQL Server 2008

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