RowFilter　為什么不能過濾呀

你这个是不是还要创建一个dataview，并设置RowFilter属性，给你一个例子：
DataView dv = new DataView();   dv.Table = DataSet1.Tables["Suppliers"];
   dv.AllowDelete = true;
   dv.AllowEdit = true;
   dv.AllowNew = true;
   dv.RowFilter = "City = 'Berlin'";
   dv.RowStateFilter = DataViewRowState.ModifiedCurrent;
   dv.Sort = "CompanyName DESC";