We have a web application that hosts multiple companies with a separate database for each. I use the databasesets and databases entries in the config file for this. On the home page I added a dropdown to pick the database set. I use the code: mmAppBase.DatabaseMgr.DatabaseSetKey=this.cboCompany.SelectedValue. This works fine at first but mmAppBase.DatabaseMgr.DatabaseSetKey seems to change at random. Is mmAppBase.DatabaseMgr.DatabaseSetKey shared ? It it possible other web sessions are changing this ? Thanks