using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        int number = 5;

        var IsDefault = number.IsDefault();

        Console.WriteLine(IsDefault);

    }

}

​

static class Extensions

{

    public static bool IsDefault<T>(this T obj)where T : struct, IEquatable<T>

    {

        return EqualityComparer<T>.Default.Equals(obj, default (T));

    }

}