public virtual string this[
	string propertyName
] { get; set; }

Public Overridable Default Property Item ( 
	propertyName As String
) As String
	Get
	Set

public:
virtual property String^ default[String^ propertyName] {
	String^ get (String^ propertyName);
	void set (String^ propertyName, String^ value);
}

abstract Item : string with get, set
override Item : string with get, set