How to convert decimal number to hexadecimal in C# using method

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using System;
using System.Text;
 
class DecToHex
{
    static void Main(string[] args)
    {
        long num = 100000;
        Console.WriteLine(DecimalToHex(num)); // 186A0
    }
 
    private static string DecimalToHex(long num)
    {
        var res = new StringBuilder();
        while (num > 0)
        {
            var reminder = num % 16;
            if (reminder > 9)
            {
                res.Insert(0, (char)(reminder + 55));
            }
            else
            {
                res.Insert(0, reminder);
            }
 
            num /= 16;
        }
 
        return res.ToString();
    }
}