void Update<T>(
	T data,
	string cacheKey,
	Nullable<TimeSpan> lifeSpan
)

Sub Update(Of T) ( _
	data As T, _
	cacheKey As String, _
	lifeSpan As Nullable(Of TimeSpan) _
)

generic<typename T>
void Update(
	T data, 
	String^ cacheKey, 
	Nullable<TimeSpan^> lifeSpan
)