Convertir un número hexadecimal a octal

public class Program
{
	public static void Main(string[] args)
	{
		Console.WriteLine("Hexadecimal to Octal conversion");
		Console.Write("Enter the Hexadecimal number : ");
		string hex = Console.ReadLine();
		string oct = Convert.ToString(Convert.ToInt32(hex, 16), 8);
		Console.Write("Hexadecimal to Octal conversion: {0}", oct);
		Console.ReadLine();
	}
}