Add args: ByVal key As IComparable, ByVal data As Object key is object that implements IComparable interface performance tip: change to use use int type (such as the hashcode)

public void Add(
	IComparable key,
	Object data
)

Public Sub Add ( _
	key As IComparable, _
	data As Object _
)

public:
void Add(
	IComparable^ key, 
	Object^ data
)