private static void ActionsOfSomething()
{
Adder a = new Adder();
Action <int, int> SumActionFor1000 = (x, y) => {
x = x * 1000;
y++;
Console.WriteLine($"Local action {x + y}");
};
// use in other class actions
a.ProcessAction(10, 1, a.SumActionFor10);
a.ProcessAction(10, 1, a.SumActionFor20);
a.ProcessAction(1, 1, a.SumActionForOther);
a.ProcessAction(11, 1, a.SumActionForOther);
// user local action
a.ProcessAction(10, 1, SumActionFor1000);
}