Использование нераспределенного локальную переменную ошибки

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Я подключаю код для проверки пароля,пароль должен содержать не менее 1 прописной буквы, 1 строчной буквы, 1 цифры и иметь минимальную длину 12 символов, если один или несколько из этих критериев не выполняются, сводка выводится на консоль, позволяя пользователю увидеть, почему пароль не был принят. Код выглядит так, как показано ниже:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Please enter a valid password");
            Console.WriteLine("Password must be minimum 12 characters long");
            Console.WriteLine("Password must contain at least one numerical value");
            Console.WriteLine("Password must contain at least one Upper case character");
            Console.WriteLine("Password must contain at least one Lower case character");

            // Variable declaration
            bool bolValidLength;
            bool bolValidUpper;
            bool bolValidLower;
            bool bolValidPassword;

            //Password declaration
            string Password = Console.ReadLine();

            //Loop program if password not acceptable

                //Checking Password Length
                int lengthPass(string pass)
                {
                    int num = 0;

                    foreach (char ch in pass)
                    {
                        if (char.IsDigit(ch))
                        {
                            num++;
                            bolValidLength = true;
                        }
                    }
                    return num;
                }

                //Checking Password for uppercase letters
                int upperCase(string pass)
                {
                    int num = 0;

                    foreach (char ch in pass)
                    {
                        if (char.IsUpper(ch))
                        {
                            num++;
                            bolValidUpper = true;
                        }
                    }
                    return num;
                }
                //Checking Password for lowercase letters
                int lowerCase(string pass)
                {
                    int num = 0;

                    foreach (char ch in pass)
                    {
                        if (char.IsLower(ch))
                        {
                            num++;
                            bolValidLower = true;
                        }
                    }
                    return num;

                }
            do
            {
                //Min pass length declaration
                const int MIN_Length = 12;

                if (Password.Length >= MIN_Length && lengthPass(Password) >= 1 && upperCase(Password) >= 1 && lowerCase(Password) >= 1)
                {
                    Console.WriteLine("The Password is good");
                    bolValidPassword = true;
                    bolValidLength = true;
                    bolValidLower = true;
                    bolValidUpper = true;
                }
                else
                {
                    Console.WriteLine("The Password is not good");
                    Console.WriteLine("Please enter a valid password");
                    Console.WriteLine("Password must be minimum 12 characters long");
                    Console.WriteLine("Password must contain at least one numerical value");
                    Console.WriteLine("Password must contain at least one Upper case character");
                    Console.WriteLine("Password must contain at least one Lower case character");
                }

                if (bolValidLength == false)
                {
                    Console.WriteLine("The Password length is too short");
                }

                if (bolValidUpper == false)
                {
                    Console.WriteLine("The Password did not contain an Uppercase letter");
                }

                if (bolValidLower == false)
                {
                    Console.WriteLine("The Password did not contain a Lowercase letter");
                }
            }
            while (bolValidPass == false);
        }
    }
}
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bolValidLength, bolValidUpper, bolValidLower have 'use of unassigned local variable' error

bolValidPass, errors appear as 'does not exist in the current context' and ' is assigned but it's value is never used'

What I have tried:

Any help is much welcomed as i have been stuck on this for the past week. Thank you

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