Negate a BigInteger value in CSharp

using System;//  www .j a  v a 2 s  . co  m
using System.Numerics;

public class Example
{
   public static void Main()
   {
        BigInteger number = 1;
        
        Console.WriteLine(BigInteger.Negate(number));        
        Console.WriteLine(-number);                          
        Console.WriteLine(number * BigInteger.MinusOne);     
   }
}