getting fields from a list<>

I have a list and it returns the data I need to fill a grid - but now I need to forward that information to a new page using stubs - I can do that but I cant figure out how to get the information from the list

            MyData.QC q = new MyData.QC();
            List<MyData.QCData> data = new List<MyData.QCData>();
            data = q.GetAllOpen(linekey, sample, tuid);
                foreach(string d in data)
                {
                MessageBox.Show(d);
                }

this doesnt work  - the error is cannot convets list to string - I could use the help if anyone knows - Thanks R