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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

    namespace Test
    {
        struct A { 
            public int i;
            public void set(int ii) { i = ii; }
        }
        class Program
        {
            static void Main(string[] args)
            {
                A a = new A();
                object o = a;
                ((A)o).set(12);
                // hier Zeile einfügen...
                Console.WriteLine(((A)o).i);
                Console.ReadLine();
            }
        }
    }