List oList =  new List();
            foreach (DataTable t in ds.Tables)
            {

                oList.Add(t.TableName);
                oList.Add(Environment.NewLine);
                foreach (DataRow r in dt.Rows)
                {
                  foreach (DataColumn c in dt.Columns)
                  {
                    oList.Add(c.Caption + "  " + r[c].ToString() + "   ");
                   
                  }
                }
                oList.Add(Environment.NewLine);
                oList.Add(Environment.NewLine);
            }

            System.IO.File.WriteAllLines(@"C:\myFile.csv", oList.ToArray());
            oConn.Close();
            MessageBox.Show("Done");