C# GridView CheckBox多选功能实现与状态存储到Session

      //Girdview CheckBox翻页多选功能，将Girdview数据转换为二位数组的方法。将check状态存入session方法
        private ArrayList RememberOldValues()
        {
            ArrayList categoryIDList = new ArrayList();
           //DataSet ds = (DataSet)gvAsset.DataSource;
           // DataTable dt = new DataTable();
           //  dt=(DataTable)gvAsset.DataSource;
            int index = -1;
            string name = "";

            foreach (GridViewRow row in gvAsset.Rows)
            {


                    index = Int32.Parse(gvAsset.DataKeys[row.RowIndex][0].ToString());
                    name = gvAsset.DataKeys[row.RowIndex][1].ToString();
                    bool result = ((CheckBox)row.FindControl("CheckOne")).Checked;
                    if (Session["CHECKED_ITEMS"] != null)
                        categoryIDList = (ArrayList)Session["CHECKED_ITEMS"];
                    if (result)
                    {
                        if (!categoryIDList.Contains(index))
                        {
                            categoryIDList.Add(new ArrayList { index, name });
                        }
                        else
                            categoryIDList.Remove(index);

                    }