Reading Offsets from a File

[Phenomena]

Recently, i started a project on creating a meta editor/creator for the game Halo, unfortantly I was doing this in VB and I was told I should do this in VB.net.

SO basically im asking how would i get a would i make it so when a file is opened wioth the open dialog, how would i get certain offsets (say offset 0x04) to show in a certain box (say Text1), I would also prefer this to be a plugin based app to lol (sorry if im being difficult )

I know this isnt the best first project to start with, but I would really like to do thise XD lol

 

[Phenomena]

sorry for double post, but i wanted to post an example

ok so lest say the circled hex in the picture below is 0x04 (for ease )

now when the tag is opened in the editor, or as I called it Guerilla, it should display in TextBox1 as '1'