Check Duplicates in Generic List

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

namespace TestConsoleApp
{
    public class DuplicatesInLinq
    {
        public class Employee
        {
            public int Id { get; set; }
            public string Name { get; set; }
        }

        public static void CheckDuplicates()
        {
            List<string> lstNames = new List<string>() { "A", "A", "B", "C" };
            bool val = lstNames.GroupBy(n => n).Any(c => c.Count() > 1);

            if (val)
                Console.WriteLine("Duplicate character found in list");

            List<int> lstNum = new List<int>() { 1, 2, 2, 3 };
            bool val1 = lstNum.GroupBy(x => x).Any(c => c.Count() > 1);

            if (val1)
                Console.WriteLine("Duplicate number found in list");

            List<Employee> lstEmployees = new List<Employee>();
            lstEmployees.Add(new Employee() { Id = 1, Name = "E1" });
            lstEmployees.Add(new Employee() { Id = 2, Name = "E2" });
            lstEmployees.Add(new Employee() { Id = 3, Name = "E2" });
            lstEmployees.Add(new Employee() { Id = 4, Name = "E4" });

            bool val3 = lstEmployees.GroupBy(x => x.Name).Any(x1 => x1.Count() > 1);

            if (val3)
                Console.WriteLine("Duplicate employees found in list");
        }

        public static void Main()
        {
            CheckDuplicates();
        }
    }
}