public void OuterMethod() {
    someControl.SomeEvent += delegate(int p1, string p2) {
        // this code is inside an anonymous delegate
    }
}

public void OuterMethod() {
    Func<int, string, string> myFunc = (int p1, string p2) => p2.Substring(p1)
}

static void Main(string[] args)
{
    int fib0 = 1; //!
    int Fib(int n) => (n < 2) ? fib0 : Fib(n - 1) + Fib(n - 2);

    Console.WriteLine(Fib(7));
    Console.ReadKey();
}

public static void SlimShady()
 {
     void Hi([CallerMemberName] string name = null)
     {
         Console.WriteLine($"Hi! My name is {name}");
     }

     Hi();
 }

public void PublicMethod() {
    void LocalMethod() {
        //do stuff
    }

    LocalMethod();
}