using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

            string password = "SuperSecurePassword";

            string salt = "RandomSalt"; //get existing salt from DB or generate a new random string

            byte[] bytesToHash = Encoding.UTF8.GetBytes(password + salt);

            using(SHA512Managed hasher = new SHA512Managed())

            {

                byte[] hashedPasswordBytes = hasher.ComputeHash(bytesToHash);

​

                Console.WriteLine(Convert.ToBase64String(hashedPasswordBytes));

            }

    }

}