Reading raw data from another processes's memory?

I've searched both google and the forums for info on this, but two problems:
1. The code is VB6 - I can't port it to VB.NET without the defined API functions not working anymore (not compilable)
2. It doesn't use managed code, so it may be a bad idea for the future? (Although I'm fine with a API solution if I can get it).

Most examples I see use ReadProcessMemory, but I can't really seem to utilize it correctly in VB.NET. I need it to basically cycle through the memory of a game, retrieving dat as byte arrays or such, I need to retrieve basic info related to cheat protection (server address, player's name, etc.).

I just need any way (even if it's not an effecient one) to read out data from memory!

Thank you!