Public ReadOnly Default Property Item( _
   ByVal index As Integer _
) As T

public T this[ 
   int index
]; {get;}

List<string> strings = new List<string>(new string[] { "a", "b", "c" });
ReadOnlyList<String> read = new ReadOnlyList<string>(strings, false);

Assert.AreEqual(3, read.Count);
strings.RemoveAt(2);
Assert.AreEqual(2, read.Count);
Assert.AreEqual("a", read[0]);
Assert.AreEqual("b", read[1]);

Assert.AreEqual("a,b", String.Join(",", read.Clone().ToArray()));

Dim strings As New List(Of String)(New String() {"a", "b", "c"})
Dim read As ReadOnlyList(Of [String]) = New ReadOnlyList(Of String)(strings, False)

Assert.AreEqual(3, read.Count)
strings.RemoveAt(2)
Assert.AreEqual(2, read.Count)
Assert.AreEqual("a", read(0))
Assert.AreEqual("b", read(1))

Assert.AreEqual("a,b", [String].Join(",", read.Clone().ToArray()))