I got an error message "Unable to cast object of type 'System.Data.DataViewManagerListItemTypeDescriptor' to type 'System.Data.DataRowView".

private void buttonSelectAllAvailableStops_Click(object sender, EventArgs e)
          {

              bool found = false;
              foreach (DataRowView drv1 in listBoxAvailableStops.Items)
              {
                  foreach (DataRowView drv2 in listBoxSelectedStops.Items)
                  {
                      if (drv1.Row.ItemArray[0].ToString().Equals(drv2.Row.ItemArray[0].ToString()))
                      {
                          found = true;
                          break;
                      }
                  }
                  if (!found)
                  {
                      DataSet dt = ((System.Data.DataSet)(((System.Windows.Forms.BindingSource)listBoxSelectedStops.DataSource)).DataSource);
                      object[] oldRow = drv1.Row.ItemArray;
                      object[] newRow = new object[3];
                      newRow[0] = oldRow[0];
                      newRow[1] = oldRow[0];
                      newRow[2] = oldRow[1];
                      dt.Tables[0].Rows.Add(newRow);
                      listBoxSelectedStops.DataSource = dt;
                  }
                 found = false;
               }
            
          }