class Socket
{
	// existing: public static bool ConnectAsync(SocketType socketType, ProtocolType protocolType, SocketAsyncEventArgs e);
	public static bool ConnectAsync (SocketType socketType, ProtocolType protocolType, SocketAsyncEventArgs e, ConnectAlgorithm connectAlgorithm);
}

// new enum
enum ConnectAlgorithm
{
    // use existing behavior.
    Default,

    // use a Happy Eyeballs-like algorithm to connect.
    Parallel = 1
}