Program.cs

using System;
using System.Globalization;
using System.Security.Authentication;
using verificationSalary;
using verificationSalary.Entities;
using verificationSalary.Entities.Enums;

namespace ProjectSalary {
    class Program{
        static void Main(string[] args) {


            Console.Write("Enter department's name: ");
            string deptName = Console.ReadLine();
            Console.WriteLine("Enter worker data: ");
            Console.Write("Name: ");
            string name = Console.ReadLine();
            Console.Write("Level (Junior/MidLevel/Senior): ");
            WorkerLevel level = Enum.Parse<WorkerLevel>(Console.ReadLine());
            Console.Write("Base salary: ");
            double baseSalary = double.Parse(Console.ReadLine(), CultureInfo.InvariantCulture);

            Department dept = new Department(deptName);
            Worker worker = new Worker(name, level, baseSalary, dept);

             Console.Write("How many contracts to this worker? ");
             int n = int.Parse(Console.ReadLine());

             for (int i = 1; i <= n; i++) 
             {
                Console.WriteLine("Enter #" + i + " contract data:");
                Console.WriteLine("Date (DD/MM/YYYY): ");
                DateTime date = DateTime.Parse(Console.ReadLine());
                Console.Write("Value per hour: ");
                double valuePerHour = double.Parse(Console.ReadLine(), CultureInfo.InvariantCulture);
                Console.WriteLine("Durations (hours): ");
                int hours = int.Parse(Console.ReadLine());
                HourContract contract = new HourContract(date, valuePerHour, hours);
                worker.AddContract(contract);
             }

             Console.WriteLine();
             Console.Write("Enter month and year to calculate income (MM/YYYY): ");
             string monthAndYear = Console.ReadLine();
             int month = int.Parse(monthAndYear.Substring(0, 2));
             int year = int.Parse(monthAndYear.Substring(3));

             Console.WriteLine();
             Console.WriteLine("Name: " + worker.Name);
             Console.WriteLine("Department: " + worker.Department.Name);
             Console.WriteLine("Income for: " + monthAndYear + ": " + worker.Income(year, month));
        }
    }
}