Public double Sumdb;
    private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)

     {
          ListItemType lit=e.Item.ItemType;

          if(lit==ListItemType.Footer)

          {

           TableCell tc1=e.Item.Cells[3];

           TableCell tc2=e.Item.Cells[4];

           TableCell tc3=e.Item.Cells[5];

           TableCell tc4=e.Item.Cells[6];

           Label L_xj=new Label();

           L_xj.ID=\"lb_xj\";

           L_xj.Width=30;

           L_xj.Text=\"合计\";

           tc1.Controls.Add(L_xj);

           Label L_SumData=new Label();

           L_SumData.ID=\"L_SumData\";

           L_SumData.Width=30;

           L_SumData.Text=SumData();

           tc2.Controls.Add(L_SumData);

    Label L_zj=new Label();

           L_zj.ID=\"lb_zj\";

           L_zj.Width=30;

           L_zj.Text=\"总合计\";

           tc1.Controls.Add(L_zj);

           Label L_SumPage = new Label();

           L_SumPage.ID=”l_sumPage”;

           L_SumPage.Width=30;

           L_SumPage.Text = Sumdb.ToString();

           tc4.Controls.Add(L_SumPage);

       }

         }
    private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)

             {

                  if(e.Item.ItemType==ListItemType.AlternatingItem || e.Item.ItemType==ListItemType.Item)

                  {

                   if( Convert.ToString( ((DataRowView)e.Item.DataItem)[\"M_sum\"]) != string.Empty)

                   {

                       dataSum += Convert.ToDouble(((DataRowView)e.Item.DataItem)[\"M_sum\"]);

                   }

              }

             }

    //M_sum为合计的字段名，绑定在DataGrid 的！