Update DataSet and Database

Question

hi, i am creating a web service that has a method in it. this method accepts a DataSet and then updates its DataSet from it. This is what I'm doing: [WebMethod] public void GetChanges(DataSet ds) { dsMaster = ds; daGames.Update(dsMaster, "tblGames"); daPubs.Update(dsMaster, "tblPublishers"); daCats.Update(dsMaster, "tblCategories"); } My problem is that the DataSet dsMaster is being updated but the database isn't. Anyone can help me with this pls? thnx :-)