public List<Exchange_Pair> GetSellList()
 {
     List<Exchange_Pair> ret = new List<Exchange_Pair>();
     foreach(Exchange_Pair1 pair in sells)
     {
         Exchange_Pair item = new Exchange_Pair();
         item.amount = pair.amount;
         item.price = pair.price;
         ret.Add(item);
     }
     return ret;
 }
 public List<Exchange_Pair> GetSellList()
 {
     List<Exchange_Pair> ret = new List<Exchange_Pair>();
     foreach(double[] pair in sells)
     {
         Exchange_Pair item = new Exchange_Pair();
         item.amount = pair[1];
         item.price = pair[0];
         ret.Add(item);
     }
     return ret;
 }