2진수 ~ 16진수 변환 (C#)

private string ConvertToBase(int number, int baseToConvert)
{
    if (baseToConvert < 2 || baseToConvert > 16)
        return null;
 
    if (number < 0)
        return null;
 
    if (number == 0)
        return "0";
 
    int remaining = number;
 
    StringBuilder sb = new StringBuilder();
 
    // 16진수 변환에 사용
    char[] hexCharacters = "0123456789ABCDEF".ToCharArray();
 
    while (remaining > 0)
    {
        int remainder = remaining % baseToConvert;
        
        if (baseToConvert == 16)
        {
            sb.Append(hexCharacters[remainder]);
        }
        else
        {
            sb.Append(remainder);
        }
        
        remaining /= baseToConvert;
    }
 
    return sb.ToString();
}