asp.net Gridview分页保存选项

                // Check in the Session
                if (Session["id"] != null)
                    categoryIDList = (ArrayList)Session["id"];
                if (result)
                {
                    if (!categoryIDList.Contains(index))
                        categoryIDList.Add(index);
                }
                else
                    categoryIDList.Remove(index);
            }
            if (categoryIDList != null && categoryIDList.Count > 0)
                Session["id"] = categoryIDList;
        }

        /// <summary>
        /// Session分頁時之前多選框為true
        /// </summary>
        private void RePopulateValues()
        {
            ArrayList categoryIDList = (ArrayList)Session["id"];
            if (categoryIDList != null && categoryIDList.Count > 0)
            {
                foreach (GridViewRow row in gridView.Rows)
                {
                    string index = (string)gridView.DataKeys[row.RowIndex].Value;
                    if (categoryIDList.Contains(index))
                    {
                        CheckBox myCheckBox = (CheckBox)row.FindControl("DeleteThis");
                        myCheckBox.Checked = true;
                    }
                }
            }
        }
        #endregion
</div>

                // Check in the Session
                if (Session["id"] != null)
                    categoryIDList = (ArrayList)Session["id"];
                if (result)
                {
                    if (!categoryIDList.Contains(index))
                        categoryIDList.Add(index);
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