Trying to generate a Single or Double random number between 0 and 1 inclusive of 0 and 1.

I can use rnd() method & it works but everyone on the various VB fora claim this is a bad way to do it (old & pseudorandom length too short)

I have tried "RandomNumberGenerator.GetInt32" and apparently this is a better method but seems to only generate integer values. I need Single/Double capability.
I do not need Crypto (just doing science Monte Carlo calculation) but would love a really long sequence before repeats.

Thanks for any help guys!