PwCS

code.cs

using System;
using System.Linq;

namespace Password_security_checker


{
        class Program
    {
            public static void Main(string[] args)
        {
        Start:
            int score = 0;
            Console.WriteLine("Enter your password:");
            string password = Console.ReadLine();
            int length = password.Length;
            Console.WriteLine("Repeat your password:");
            string repeatPassword = Console.ReadLine();

            
            if (length >= 8)
            {
                score++;
            }
            else
            {
                Console.WriteLine("Password is too short");
                goto Start;
            }
            if (password.Any(char.IsUpper))
            {
                score++;
            }
            if (password.Any(char.IsLower))
            {
                score++;
            }
            if (password.Any(char.IsDigit))
            {
                score++;
            }
            if (password.Any(char.IsSymbol))
            {
                score++;
            }
            if (password == repeatPassword)
            {
                Console.WriteLine("Your password is: " + password);
            }
            else if (password != repeatPassword)
            {
                Console.WriteLine("Password does not match");
                goto Start;                            
            }
            Console.WriteLine("Your password score is " + score);
        }
    }
}

Clean coding tips:

#1: Remove empty spaces https://gist.github.com/AntonGrig/dbeaa3fb610b0ee86dd50b863315f034#file-code-cs-L5-L6
The correct way of formatting the code is putting a statement, and then the curly brace goes on the next line without any whitespaces.

Also, the lines of code should not be separated by more than 2 empty lines.

#2: using "goto"s is considered an anti-pattern https://gist.github.com/AntonGrig/dbeaa3fb610b0ee86dd50b863315f034#file-code-cs-L12. If you're using it then you need to rethink the strategy.

I suggest using while or do-while loop (tutorial: https://www.tutorialsteacher.com/csharp/csharp-do-while-loop)

e.g.

while (true) {
   // check the password, store the result in a variable, like isValidPassword

  // then...
  if (isValidPassword) {
    break; // exit the loop
  } else {
    Console.WriteLine("Password does not match or is too short");
  }
}