Hash Password in C#? Bcrypt/PBKDF2

PBKDF2

You were really close actually. The link you have given shows you how you can call the Rfc2898DeriveBytes function to get PBKDF2 hash results. However, you were thrown off by the fact that the example was using the derived key for encryption purposes (the original motivation for PBKDF1 and 2 was to create "key" derivation functions suitable for using as encryption keys). Of course, we don't want to use the output for encryption but as a hash on its own.

You can try the SimpleCrypto.Net library written for exactly this purpose if you want PBKDF2. If you look at the implementation, you can see that it is actually just a thin wrapper around (you guessed it) Rfc2898DeriveBytes.

BCrypt

You can try the C# implementation named (what else) BCrypt.NET if you want to experiment with this variant.

Disclaimer: I have not used or tested any of the libraries that I have linked to... YMMV

First of all, I urge everyone to use a cryptographically verified reference algorithm included with the platform itself.

Do not use 3rd party packages and non-verified OSS components or any other code you just copy-pasted from the Internet.

For .NET use PBKDF2 and not bCrypt because there's no certified implementation of bCrypt for .NET

I don't mean any disrespect for any noble open-source devs (being one myself), but you can never be sure their website won't be hacked in 10 years and you end up getting a malware package from Nuget/npm or other package managers.

More info about verification can be found in this SO answer

Now, back to PBKDF2, here's the simple code

public static byte[] PBKDF2Hash(string input, byte[] salt)
{
    // Generate the hash
    Rfc2898DeriveBytes pbkdf2 = new Rfc2898DeriveBytes(input, salt, iterations: 5000);
    return pbkdf2.GetBytes(20); //20 bytes length is 160 bits
}

If you need a string representation of the hash (not byte-array) - you can use this superfast conversion class from this answer http://stackoverflow.com/a/624379/714733