using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

public static class BoxManager

{

    public static object Box(ValueType value)

    {

        return new Box(value);

    }

    public static T Unbox<T>(object value) where T : structure

    {

        var box = value as Box;

        if (box == null)

            throw new ArgumentException("Value must be Box");

        try

        {

            var result = (T)box.Value;

            return result;

        }

        catch (Exception ex)

        {//Можно обработать

            throw;

        }

    }

}

​

internal class Box

{

    internal Box(ValueType value)

    {

        Value = value;

    }

    internal ValueType Value {get; private set;}

}

​