Visibility example

gistfile1.cs

internal class FooBarDaddy
{
    public void Run()
	{
		Foobar1 fb = new Foobar1();
	}
	
	/// Only accessible inside FooBarDaddy
	private class Foobar1
	{
		/// Only accessible inside Foobar1
		private interface IFoo
		{
		}
	
		/// Only accessible inside Foobar1
		private struct Foobar2
		{
			/// Only accessible inside Foobar2
			private struct Foobar3
			{
			}
		}
	}
}