private static DPSNodeSetting Load()
 {
     DPSNodeSetting tmp = null;
     try
     { 
         string json = File.ReadAllText(fileName);
         tmp = JsonConvert.DeserializeObject<DPSNodeSetting>(json);
     }
     catch(Exception e)
     {
         tmp = new DPSNodeSetting();
     }
     return tmp;
 }
 public static void Reload()
 {
     instance = Load();
 }