looking for c# equivalent of php's password-verify()

Got it!

First install CryptSharp via NuGet Package. (Use the 2.0 "official" package), and by the way, BCrypt.net didn't work for me.

Then:

using CryptSharp;
bool matches = Crypter.CheckPassword("password goes here", "hash goes here");

Note that hash should start with something like: "$2y$..."

Works like a charm! :-)