public void RemoveMoney(decimal sum, CurruncyType type)
 {
     if (type == CurruncyType.Leva)
     {
         this.currencySumm.Leva -= sum;
     }
     else if (type == CurruncyType.Euro)
     {
         this.currencySumm.Euro -= sum;
     }
     else if (type == CurruncyType.USD)
     {
         this.currencySumm.Usd -= sum;
     }
 }
 // Public methods
 public void AddMoney(decimal sum, CurruncyType type)
 {
     if (type == CurruncyType.Leva)
     {
         this.currencySumm.Leva += sum;
     }
     else if (type == CurruncyType.Euro)
     {
         this.currencySumm.Euro += sum;
     }
     else if (type == CurruncyType.USD)
     {
         this.currencySumm.Usd += sum;
     }
 }