using System;

using System.Linq;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        string decString = "0123456789";

        byte[] bytes = Encoding.Default.GetBytes(decString);

        string hexString = BitConverter.ToString(bytes);

        hexString = hexString.Replace("-", "");

        Console.WriteLine(hexString);

    }

}