for switch to accdb file you can use below code:
strConnString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & Server.MapPath("./db/snitz.accdb") & "; Persist Security Info=False;" '## MS Access 2007
strConnString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Inetpub\db\snitz.accdb;Jet OLEDB:Database Password=MyDbPassword;" '## MS Access 2007 with Password
but how to Compacting accdb file?
please help me