Convert BigInteger to byte array in CSharp

using System;//  w  w w. ja v  a  2 s .  co m
using System.Numerics;

public class Example
{
   public static void Main()
   {
        BigInteger positiveValue = BigInteger.Parse("9999999999999999999999999");
        BigInteger negativeValue = BigInteger.Add(-Int64.MaxValue, -60000); 
        BigInteger positiveValue2, negativeValue2;
        
        // Create two byte arrays.
        byte[] positiveBytes = positiveValue.ToByteArray();
        byte[] negativeBytes = negativeValue.ToByteArray();
        
        // Instantiate new BigInteger from negativeBytes array.
        Console.Write("Converted {0:N0} to the byte array ", negativeValue);
        foreach (byte byteValue in negativeBytes)
           Console.Write("{0:X2} ", byteValue);

        negativeValue2 = new BigInteger(negativeBytes);
        Console.WriteLine("Converted the byte array to {0:N0}", negativeValue2);
        
        // Instantiate new BigInteger from positiveBytes array.
        Console.Write("Converted {0:N0} to the byte array ", positiveValue);
        foreach (byte byteValue in positiveBytes)
           Console.Write("{0:X2} ", byteValue);
        
        positiveValue2 = new BigInteger(positiveBytes);
        Console.WriteLine("Converted the byte array to {0:N0}", positiveValue2);
   }
}