大家好，我想用datagrid的编辑列对模板列中的TEXTBOX控件进行设置，可是
private void dataGrid_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        {
                this.dataGrid.EditItemIndex=e.Item.ItemIndex;                
//                string startTime=((TextBox)e.Item.FindControl("txtSTime")).Text;
//                string endTime=((TextBox)e.Item.FindControl("txtETime")).Text;
            //((TextBox)e.Item.Cell[2].Controls[0]).Text
            ((TextBox)e.Item.Cells[9].FindControl("txtSTime")).Enabled=true;
            ((TextBox)e.Item.Cells[10].FindControl("txtETime")).Enabled=true;
                if(DB.ExecuteNonQuery(SPHelper.Exam_SetHeader("updateTime",MySession.LoginName,MySession.OpUID,MySession.CurRoleID,null,null,null
                    ,((TextBox)e.Item.Cells[9].FindControl("txtSTime")).Text,((TextBox)e.Item.Cells[10].FindControl("txtETime")).Text,null,null,null,null,null,null,null,null,null,null,null,null))>0)
                {
                    dataGrid.EditItemIndex = (int)e.Item.ItemIndex;
                    ((TextBox)e.Item.Cells[9].FindControl("txtSTime")).Enabled=false;
                    ((TextBox)e.Item.Cells[10].FindControl("txtETime")).Enabled=false;
                }    
            BindDataGrid();
        }

        private void dataGrid_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        {
            dataGrid.EditItemIndex = (int)e.Item.ItemIndex;
            ((TextBox)e.Item.Cells[9].FindControl("txtSTime")).Enabled=true;
            ((TextBox)e.Item.Cells[10].FindControl("txtETime")).Enabled=true;
            BindDataGrid();
        }

        private void dataGrid_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        {
            dataGrid.EditItemIndex = -1;
            ((TextBox)e.Item.Cells[9].FindControl("txtSTime")).Enabled=false;
            ((TextBox)e.Item.Cells[10].FindControl("txtETime")).Enabled=false;
            BindDataGrid();
        }        
我这样写了之后，运行了，每个事件也都执行了，可是控件仍不可用，请问是怎么回事？