Select

            string strCampaignQuery = "SELECT  FROM ";
            dbMan.parameterDelete();
            dbMan.AddParameterValue("adminID", id);
            DataTable campaign = dbMan.GetDataSet(strCampaignQuery).Tables[0];

            List<Campaigns> campaignsList = new List<Campaigns>();

            foreach (DataRow item in campaign.Rows)
            {
                Campaigns t = new Campaigns
                {
                    Campaign_ID = Convert.ToInt32(item["Campaign_ID"]),
                    Campaign_Name = item["Campaign_Name"].ToString(),
                    Campaign_Begin_Date = Convert.ToDateTime(item["Campaign_Begin_Date"]),
                    Campaign_End_Date = Convert.ToDateTime(item["Campaign_End_Date"])
                };
                campaignsList.Add(t);
            }
            return new JavaScriptSerializer().Serialize(campaignsList);