Through Central Administration:
you receive this error
Method not found: 'Microsoft.SharePoint.Administration.SPContentDatabase Microsoft.SharePoint.Administration.SPContentDatabaseCollection.Add(System.String, System.String, System.String, System.String, Int32, Int32, Int32, Boolean, Boolean)'.
Resolution:
Use stsadm to add content db
C:
cd C:\Program Files
cd Common Files
cd Microsoft Shared
cd web server extensions
cd 12
cd bin
stsadm -o addcontentdb -url http://BENNA0SHRPT2:7777 -clearchangelog -databaseserver Severname -databasename NewDBName

