More tests as ASP.NET script.

ilist-test.aspx

<script runat="server">
enum Set {
	One = 1,
	Two = 2
}

enum ItemOne {
	One = 1
}

void Page_Load(object o, EventArgs e) {
	WriteLine((Set.One == (Set)(object)ItemOne.One));
	WriteLine(Set.One == (Set)(object)ItemOne.One);

	WriteLine((object)Set.One == (object)ItemOne.One);

	var list = new List<Set>();
	list.Add(Set.One);

	WriteLine(((IList)list).Contains(ItemOne.One)); //Mono: true, .NET: false
	WriteLine(((IList)list).IndexOf(ItemOne.One)); //Mono: 0, .NET: -1

	var arrList = new ArrayList();
	arrList.Add(Set.One);
	WriteLine(((IList)arrList).Contains(ItemOne.One));
	WriteLine(((IList)arrList).IndexOf(ItemOne.One));
	


	Set[] arr1 = new Set[1] { Set.One };
	WriteLine(Array.IndexOf(arr1, ItemOne.One));
	WriteLine(((IList)arr1).IndexOf(ItemOne.One));

	ItemOne[] arr2 = new ItemOne[1] { ItemOne.One };
	WriteLine(Array.IndexOf(arr2, Set.One));
	WriteLine(((IList)arr2).IndexOf(Set.One));

	WriteLine((object)Set.One == (object)ItemOne.One);
	WriteLine(Set.One.Equals(ItemOne.One));
	WriteLine(ItemOne.One.Equals(Set.One));
}

void WriteLine(object o) {
	Response.Write(o.ToString() + "<br />");
}
</script>