using System;

public class Program

{

    public static void Main()

    {

            Console.WriteLine(IsBoxed((ValueType)42));    

    Console.WriteLine(IsBoxed(42));   

    Console.WriteLine(IsBoxed((object)42)); 

    Console.WriteLine(IsBoxed((IComparable)42));  

    }

    public static bool IsBoxed<T>(T value)

{  

    return

        (typeof(T).IsInterface || typeof(T) == typeof(object)) &&

        value != null &&

        value.GetType().IsValueType &&  !typeof(T).IsValueType ;

}

​

}