using System;

using System.Collections.Generic;

​

namespace UsingLinq

{

    class Employee

    {

        public int Id { get; set; }

        public string Name { get; set; }

        public string FatherName { get; set; }

    }

​

    class Program

    {

        static List<Employee> lstEmployees = new List<Employee>();

​

        static void Main()

        {

            while (true)

            {

                Console.WriteLine("1. Add Employee");

                Console.WriteLine("2. Remove Employee");

                Console.WriteLine("3. Find Employee");

                Console.WriteLine("4. Exit");

​

                Console.WriteLine("Enter your choice: ");

                int selected = int.Parse(Console.ReadLine());

​

                switch (selected)

                {

                    case 1:

                        AddEmployee();

                        break;

                    case 2:

                        RemoveEmployee();

                        break;

                    case 3:

                        FindEmployee();

                        break;

                    case 4:

                        Environment.Exit(0);

                        break;

                    default:

                        Console.WriteLine("Invalid choice!");

                        break;

                }

​

                Console.WriteLine("Do you want to continue? (y/n)");

                if (Console.ReadLine().ToLower() != "y")

                {

                    break;

                }

            }

        }

​

        static void AddEmployee()

        {

            Employee employee = new Employee();

            Console.Write("Enter Employee Id: ");

            employee.Id = int.Parse(Console.ReadLine());

​

            Console.Write("Enter Employee Name: ");

            employee.Name = Console.ReadLine();

​

            Console.Write("Enter Employee Father's Name: ");

            employee.FatherName = Console.ReadLine();

​

            lstEmployees.Add(employee);

​

            Console.WriteLine("Employee added successfully!");

        }

​

        static void RemoveEmployee()

        {

            Console.Write("Enter Employee Id to remove: ");

            int idToRemove = int.Parse(Console.ReadLine());

​

            Employee employeeToRemove = lstEmployees.Find(e => e.Id == idToRemove);

            if (employeeToRemove != null)

            {

                lstEmployees.Remove(employeeToRemove);

                Console.WriteLine("Employee removed successfully!");

            }

            else

            {

                Console.WriteLine("Employee not found!");

            }

        }

​

        static void FindEmployee()

        {

            Console.Write("Enter Employee Id to find: ");

            int idToFind = int.Parse(Console.ReadLine());

​

            Employee foundEmployee = lstEmployees.Find(e => e.Id == idToFind);

            if (foundEmployee != null)

            {

                Console.WriteLine($"Employee found: {foundEmployee.Name}, Father's Name: {foundEmployee.FatherName}");

            }

            else

            {

                Console.WriteLine("Employee not found!");

            }

        }

    }

}

​