using System;

public class Program

{

    public static void Main()

    {

        long l = 123456;

        Object value = l;

        if (value is Int64)

        {

            Int64 v64 = (Int64)value;

            Console.WriteLine("v64=" + ((double)v64) + "");

        }

        // Casting from Object holding a long/Int64 fails

        Console.WriteLine((double)value);

    }

}