Inheritance: System.EventArgs
 private void OnNewGroupUpdate(object sender, GroupUpdateEventAgrs args)
 {
     lock (this)
     {
         if (args.GroupUpdate.GroupId != -1)
         {
             var list = this.listenersByGroupId[args.GroupUpdate.GroupId];
             list?.ForEach(l => l.OnNewGroupUpdate(args.GroupUpdate));
         }
     }
 }
 private void OnNewGroupUpdate(object sender, GroupUpdateEventAgrs args)
 {
     lock (this)
     {
         if (args.GroupUpdate.GroupId != -1)
         {
             var list = this.listenersByGroupId[args.GroupUpdate.GroupId];
             list?.ForEach(l => l.OnNewGroupUpdate(args.GroupUpdate));
         }
     }
 }