private void DoSearchCampaign(int pageIndex) { try { //RankingCampaignBiz biz = new RankingCampaignBiz(); if (ViewState["Campaign"] == null) { List <RankingCampaignData> list = RankingCampaignBiz.GetRankingCampaignList(hidRankingId.Value.Trim()); ViewState["Campaign"] = list; } BindGridview_gvAddCampaign(((List <RankingCampaignData>)ViewState["Campaign"]).ToArray()); } catch (Exception ex) { throw ex; } }