What competent ways can you stop password guessing for a self-written engine?

Question

C++ / C#

Actually, the whole question is in the title

Answer 1

I do not get what you want.
MSVC2017 compiles fine.

Answer 2

1. introduce a limit on the number of errors when entering a password
2. if the maximum number of errors is reached - ban the ip-address for a while
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the easier option is to put a captcha, for example, from Google

Answer 3

+ so that the coolhacker does not start using a proxy, you can not show him the error "they say the number of attempts completed" and issue the same page "user not found" but no longer search the database.