//创建句柄委托
  private void dgOrderConfirm_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
  {
   if(e.Item.ItemType==ListItemType.Item||e.Item.ItemType==ListItemType.AlternatingItem)
   {
    CheckBox cb=(CheckBox)e.Item.FindControl("cbselect");
    cb.CheckedChanged+=new System.EventHandler(this.cbselectChanged);
   }
  }
  //创建事件
  private void cbselectChanged(object sender,System.EventArgs e)
  {
   CheckBox cb=(CheckBox)sender;               
   DataGridItem li=(DataGridItem)cb.Parent.Parent;

    if(cb.Checked==true)
    {
     li.Cells[8].Text=string.Format("{0:F2}",float.Parse(li.Cells[7].Text)*(float.Parse(((TextBox)li.FindControl("tbdiscount")).Text))).ToString();
     this.lbgetsum.Text=string.Format("{0:F2}",(float.Parse(this.lbgetsum.Text)+float.Parse(li.Cells[8].Text))).ToString();
    }
    else
    {
     this.lbgetsum.Text=string.Format("{0:F2}",(float.Parse(this.lbgetsum.Text)-float.Parse(li.Cells[8].Text))).ToString();
     li.Cells[8].Text="";
    }   
  }
//遍历datagrid
foreach(DataGridItem dgi  in DataGrid1.Items)
{
if(((CheckBox)dgi.FindControl("cbselect")).Checked && (((CheckBox)dgi.FindControl("cbback")).Checked))
     {
      Response.Write(string.Format("<script language='javascript'>alert(\"不能收款和退单同时都选中\");</script>"));
      return;
     }
}