/// <summary>
/// Trading action.
/// </summary>
/// <param name="tradeType">Trading type sell or buy</param>
/// <param name="number">Number of trading action.</param>
/// <returns>Result of trading</returns>
public string Trade(TradeType tradeType, int number, List <IOption> options)
{
switch (tradeType)
{
case TradeType.Sell:
trade = new SellTrading();
return(trade.Execute(SellRate, number, options));
case TradeType.Buy:
trade = new BuyTrading();
return(trade.Execute(BuyRate, number, options));
default:
return("Trade type is invalid");
}
}