using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int arabicNumber = 10;

        Dictionary<int, string> arabicRomanMap = new Dictionary<int, string>() { {1, "I"}, {5, "V"}, {10, "X"} };

        var arabicArray = arabicNumber

            .ToString()

            .Select(_=> Convert.ToInt32(_))

            .ToArray();

​

        var romanResult = new List<string>();

​

        for (int i = 0; i < arabicArray.Length; i++)

        {

            var decimalMultiplier = Math.Pow(10, i);

            var arabicDecimal = arabicArray[i] * decimalMultiplier;

            var result = "";

            arabicRomanMap.TryGetValue((int)arabicDecimal, out result);

            romanResult.Add(result);

        }

​

        romanResult.Reverse();

        Console.WriteLine("Result: " + string.Join("", romanResult));

    }

}