Recently played XPO, this thing is really good, but the default is to use the Access database, you want to use MSSQL, but you write the database connection string that you can't use this string of the string today, hurry up. Session oSession = new Session (); oSession.AutoCreateOption = AutoCreateOption.SchemaOnly; oSession.ConnectionString = "packet size = 4096; user id = sa; data source = 127.0.0.1; persist security info = True; initial catalog = databasename; password = "; OSSSION.CONNECT ();