A get or set accessor required (Console Application)

[Petabyte]

Beginner here. I'm stuck on chapter 8 in my book: Nested If Statements.

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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main();
           int ID
        { 
                   Console.WriteLine("Enter Username");
                string Name = Console.ReadLine();
            if (Name.ToLower() == "administrator")
           }
    {
            
                Console.WriteLine("Welcome System Administrator. Enter your password.");
                if (Console.ReadLine() == "root")
                {
                    Console.WriteLine("System Administrator logon successful!");
                }
                else
                {
                    Console.WriteLine("Invalid password. Please log on as guest.");
                }
            }
            else
            {
                Console.WriteLine("Welcome System User. Please enter the confirmation code to confirm you are a user of the mainframe.");
                    if (Console.ReadLine() == "ibmmainframe7")
                    {
                        Console.WriteLine("Welcome System User. Please enter your ID");
                ID = Console.ReadLine();
                Console.WriteLine("Welcome system user # " ID);
            }
                else
            {
                Console.WriteLine("Welcome System Guest!");
            }

            }


         Console.ReadLine();
                
                }
        }
    }