myAdapter.DeleteCommand=new OleDbCommand("delete from Products where ProductsID=? and ProID<0",myOleConnection);
OleDbParameter delProIDParm = myAdapter.DeleteCommand.Parameters.Add("@ProductsID", OleDbType.BigInt);
delProIDParm.SourceColumn = "ProductsID";
delProIDParm.SourceVersion = DataRowVersion.Original;
delete from Products where ProductsID=? and ProID <0
应该为delete from Products where ProductsID=?