var conn = new SqlConnection(ConnString);
        conn.Open();
        var data = new Dictionary<string, List<object>>();
        foreach (var h in hours)
        {
            data += SqlUniversal.GetAllData(query,
                new[] {
                    //some parameters
                },
                conn);
        }
//Here is the method, above is how I call it.
        public static Dictionary<string, List<object>> GetAllData(string command, SqlParameter[] pars, SqlConnection conn)
        {
        if (conn == null)
        {
            conn = new SqlConnection(ConnString);
            conn.Open();
        }
        var res = new Dictionary<string, List<object>>();
        using (conn)
        {
            using (var cmd = new SqlCommand(command, conn))
            {
                cmd.Parameters.AddRange(pars);
                using (var reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                        for (var i = 0; i < reader.VisibleFieldCount; i++)
                        {
                            if (reader.GetValue(i) == DBNull.Value)
                                continue;

                            var name = reader.GetName(i);

                            if (res.ContainsKey(name))
                                res[name].Add(reader.GetValue(i));

                            else
                                res.Add(name, new List<object> {reader.GetValue(i)});
                        }

                    return res;
                }
            }
        }
    }