public static void main()
{
ReferencesExample re = new ReferencesExample();
// Returns a reference type, caller can access member - gaping hole in your class encapsulation.
var modifiableList = re.getListOfNamesUsingModifiableReferenceType();
Console.WriteLine("Before modification: ");
modifiableList.Add("Saori");
Console.WriteLine("After modification: ");
modifiableList.ForEach(Console.WriteLine);
// Returns object that implements an interface that does not have any modification methods.
// Using interfaces, you can choose to expose only ther methods and properties you want clients to use.
var enumerableList = re.getListOfNamesUsingReadonlyInterface();
// Uses extention method created above.
enumerableList.ForEach(Console.WriteLine);
// Returns read-only collection that does not support modification methods.
var readonlyList = re.getListOfNamesUsingReadOnlyCollection();
Console.WriteLine(readonlyList.Count);
}