gistfile1.txt

using System;
using System.Collections;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        MySetting setting = new MySetting()
        {
            Value = Double.NaN,
            Values = new double[] { Double.NaN },
            Special = ""
        };
    }
}

public class ValueSpecial
{
    public string Code { get; set; }
    public string Value { get; set; }

    public override string ToString()
    {
        return "dummy";
    }
}

public class MySetting
{
    public Double Value { get; set; }
    public string Special { get; set; }
    public Double[] Values { get; set; }
    public ValueSpecial[] Specials { get; set; }

    public ValueSpecial AddSpecial(string code, string value)
    {
        ValueSpecial special = new ValueSpecial() { Code = code, Value = value };
        return special;
    }

    public void ForgetSpecial(string code)
    {
    }

    public override string ToString()
    {
        return "Not today";
    }
}