Accessing Multipage TIFF file via byte offset in .NET?

I have a big (500+ MB) multipage TIFF image file and a database file
which contains index to each image in the TIFF file.

The scheme of the database is very simple.


imagename (text)
byte offset (integer)


So, it would list as


imagename, byte offset
mydoc1, 8
hisdoc99, 4795
herdoc88, 75890
and so on..


I've searched internet for accessing each image in multipage TIFF
file, and only found methods to access image via page number, but not
via byte offsets.


How can I access each page in this multipage tiff file via byte
offset
in either C#, VB.net ?