gistfile1.txt

    public static class TaxCalculatorFactory
    {
        public static ITaxCalculator GetForCountry(Country country)
        {
            switch (country)
            {
                case Country.Poland:
                    return new PolandTaxCalculator();
                case Country.England:
                    return new EnglandTaxCalculator();
                default:
                    throw new ArgumentOutOfRangeException(nameof(country), country, null);
            }
        }
    }

    public enum Country
    {
        Poland,
        England
    }

    public interface ITaxCalculator
    {
        decimal ComputeTax(decimal price);
        decimal GetTax();
    }

    public class PolandTaxCalculator : ITaxCalculator
    {
        public decimal ComputeTax(decimal price)
        {
            throw new NotImplementedException();
        }

        public decimal GetTax()
        {
            return 23;
        }
    }

    public class EnglandTaxCalculator : ITaxCalculator
    {
        public decimal ComputeTax(decimal price)
        {
            throw new NotImplementedException();
        }

        public decimal GetTax()
        {
            return 0;
        }
    }