【www.gdgbn.com--安卓教程】

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();

本文来源：http://www.gdgbn.com/shoujikaifa/3508/