Is it possible to create a logIn Page...?

Is it possible to create a logIn page, whilst reading the information out of a file will usernames and passwords in it.
Data in file set out like this -----> 2
1
Username1
Password1
2
Username2
Password2

I was just wondering if this was possible in visual basic? and if so how would i come about to start the code, I have 2D arrays and that is how the data is stored in file. Its just baffled me a little.

Thanks