public static void Main(string[] args)
{
var v = "from main";
var r = new Refstr();// { s = v };
r.s = v;
test(r);;
v = r.s;
Console.WriteLine("Hello World!\n");
Console.WriteLine(v);
var sm = new TestControl();
sm.Run();
}
static void test(Refstr r)
{
r.s += "!test";
}