vb.net - Editing hex of code of an application -

i have seen few application can edit blocks of hex giving valid offset.

the question is, how that? there function allow binary string editing in vb.net?

there no on google, tell me how can edit application source in vb.net in hex editor?

have @ this:

1. call file.openwrite filestream file

2. set stream.position jump location want edit

3. call stream.write overwrite bytes in file.