A bit rewritten version of https://gist.github.com/AntonGrig/dbeaa3fb610b0ee86dd50b863315f034

PasswordCheck.cs

using System;
using System.Linq;

namespace PasswordCheck
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Console.WriteLine("Enter your password:");
                
                var password = Console.ReadLine();
                if (string.IsNullOrWhiteSpace(password))
                {
                    Console.WriteLine("Password has not been entered. Try again.");
                    continue;
                }
            
                Console.WriteLine("Repeat your password:");
                var repeatPassword = Console.ReadLine();
                if (string.IsNullOrWhiteSpace(repeatPassword))
                {
                    Console.WriteLine("Password has not been entered. Try again.");
                    continue;
                }

                if (password != repeatPassword)
                {
                    Console.WriteLine("Password does not match. Try again.");
                    continue;
                }

                var score = 0;
                if (password.Any(char.IsUpper))
                {
                    score++;
                }
                if (password.Any(char.IsLower))
                {
                    score++;
                }
                if (password.Any(char.IsDigit))
                {
                    score++;
                }
                if (password.Any(char.IsSymbol))
                {
                    score++;
                }
                
                Console.WriteLine("Your password is: " + password);
                Console.WriteLine("Your password score is " + score);
                break;
            }
        }
    }
}