This maybe discussed here before but I did not see a clear solution so far. I need to access multiple data source at the same time, reading from DateSource1 and wrting to DataSource2. Two questions: 1) Do I have to use two mapper "config" files for this? There are objections among teammates to have two SqlMapper config files 2) Could the connection string of a SqlMapper instance be assigned/changed OUTSIDE the config file at runtime? Thanks for the information! Wei Cheng Canada ____________________________________________________________________________________ Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains. http://farechase.yahoo.com/promo-generic-14795097