I am unable to compile the code below - using C# ORCAS (9.0.20404.0 Beta 1 -
JUNE 2007), because i get the following error:

'System.Numeric.BigInteger' is inaccessible due to its protection level
C:\Documents and Settings\Massimo\Local Settings\Application Data\Temporary
Projects\TestBigInteger\Program.cs 12 40 TestBigInteger

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using System;

using System.Numeric;

namespace TryOutBigInteger {

   class MyBigIntApp {

       static BigInteger BigFactorial(BigInteger x) {

           if (x < 0)

               return BigFactorial(-x);

           else if (x <= 1)

               return x;

           else return x * BigFactorial(--x);

       }

       static void Main(string[] args) {

           BigInteger x = BigInteger.Parse(Console.ReadLine());

           Console.WriteLine(BigFactorial(x).ToString());

           Console.ReadLine();

       }

   }

}

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http://blogs.msdn.com/bclteam/archive/2007/01/16/introducing-system-numeric-bigi
nteger-inbar-gazit.aspx

Any help ?

Thanks.