"[{\"Date\":\"2020-03-27T00:00:00\",\"Units\":1035.0},{\"Date\":\"2020-03-26T00:00:00\",\"Units\":1137.0},{\"Date\":\"2020-03-25T00:00:00\",\"Units\":1283.0},{\"Date\":\"2020-03-24T00:00:00\",\"Units\":635.0}]"

using Newtonsoft.Json;
public string GetFanHoursReport(string fromdate, string todate)
    string jsondata = "";
    using (ColdStorageAppEntities entities = new ColdStorageAppEntities())
            using (SqlConnection con = new SqlConnection(strcon_coldstorage))
                con.Open();
                SqlCommand cmd_getlatest = new SqlCommand(@"SELECT * from RawData", con);
                SqlDataAdapter da_getlatest = new SqlDataAdapter(cmd_getlatest);
                DataTable dt_getlatest = new DataTable();
                da_getlatest.Fill(dt_getlatest);
                jsondata=DataTableToJSONWithJSONNet(dt_getlatest);
            return jsondata;
        catch (Exception)
            return null;