Math.Round.Default.cs

class Program
{
    static void Main()
    {
        Console.WriteLine("Default Math.Round(x)");
        
        Console.WriteLine(Round(1.5));
        Console.WriteLine(Round(2.5));
        Console.WriteLine(Round(3.5));
    }

    private static string Round(double value)
    {
        var result = Math.Round(value);
        return string.Format(CultureInfo.InvariantCulture, "Math.Round({0}) --> {1}", value, result);
    }
}