如何找到datagrid的header行上放置的checkbox
private void dgUser_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
CheckBox objSel =new CheckBox();
objSel=(CheckBox)e.Item.Cells[1].FindControl("ckSelectAll");
objSel.Attributes["onclick"]="javascript:seletAll()"; //出错
}