public abstract void Cas(
	string key,
	Object data,
	TimeSpan expiration,
	ulong casUnique
)

Public MustOverride Sub Cas ( _
	key As String, _
	data As Object, _
	expiration As TimeSpan, _
	casUnique As ULong _
)

public:
virtual void Cas(
	String^ key, 
	Object^ data, 
	TimeSpan expiration, 
	unsigned long long casUnique
) abstract