Untitled

using System;

class X
{
        static bool Test (object o)
        {
                return o is int?;
        }

        static void Main ()
        {
                object o = 1;
                Console.WriteLine (o is int?);
                Console.WriteLine (o is Nullable<int>);
                Console.WriteLine (o is int);
                Console.WriteLine (Test (o));
        }
}