.NET gives you two ways to generate random numbers – a fast but insecure way, and a cryptographically pseudorandom way which is safe to use for cryptography. Both are easy to use.
For non-secure purposes, create a single instance of Random – this can be a singleton or a static field – just don’t create a new one every time you need it, because you might end up with dupes that way. Random is also not thread-safe, so make sure you access it in a thread-safe way if there’s the possibility of multiple threads accessing it.
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