DataGrid脚眉显示合计

    创建一个全局变量

    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！