using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("4.2 -> {0}", Round(4.2m));

        Console.WriteLine("4.6 -> {0}", Round(4.6m));

        Console.WriteLine("4.0   -> {0}", Round(4.0m));

    }

    public static int Round(decimal value)

    {

        if (value - Math.Floor(value) == 0) return 0;

        return (int)Math.Ceiling(value);

    }

}

​