RomanNumeralsGenerator.cs

using System;
public class RomanNumeralsGenerator {
    
    public string ToRoman(int number)
    {
        var romanNumerals = new string[][]
        {
            new string[]{"", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"}, // ones
            new string[]{"", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"}, // tens
            new string[]{"", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"}, // hundreds
            new string[]{"", "M", "MM", "MMM"} // thousands
        };
 
        // split integer string into array and reverse array
        var intArr = number.ToString().Reverse().ToArray();
        var len = intArr.Length;
        var romanNumeral = "";
        var i = len;
 
        // starting with the highest place (for 3046, it would be the thousands
        // place, or 3), get the roman numeral representation for that place
        // and add it to the final roman numeral string
        while (i-- > 0)
        {
            romanNumeral += romanNumerals[i][intArr[i].ToString()];
        }
 
        return romanNumeral;
    }

}