gistfile1.txt

using System;
using System.Collections;

interface IFoo {}
class Bar : MarshalByRefObject {
  public void Tst () {}

	public int field;
}

class Driver : IFoo {
	
	static void Main ()
	{
		var f = new Driver ();
		Console.WriteLine ("{0} == f", f is ICollection);
		Console.WriteLine ("{0} == t", f is IFoo);
		try {
			var g = (IFoo)f;
			Console.WriteLine ("cast/1 ok");
		}catch (InvalidCastException) {Console.WriteLine ("cast/1 bad"); }
		
		try {
			var h = (ICollection)f;
			Console.WriteLine ("cast/2 bad");
		}catch (InvalidCastException) {Console.WriteLine ("cast/2 ok"); }
		
		var b = new Bar ();
		b.Tst ();
		Console.WriteLine (b.field);

	}
}