TEAMModelOS/TEAMModelAPI/Program.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace TEAMModelAPI
{
    public class Program
    {
        public static void Main(string[] args)
        {
            List<string> a = new List<string>() { "1", "2", "3", "4", "5" };
            List<string> b = new List<string>() { };
            var c =  b.Where(x => !a.Any(y => y.Equals(x))).ToList();
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }
}