Factory need to use migration in .Net Core 2.1

ContextFactory.cs

using System.IO;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.Extensions.Configuration;

namespace StoreOfBuild.Data.Contexts
{
    public class ContextFactory : IDesignTimeDbContextFactory<ApplicationDbContext>
    {
        public ApplicationDbContext CreateDbContext()
        {
            return CreateDbContext(null);
        }
        
        public ApplicationDbContext CreateDbContext(string[] args)
        {
            var builderConfiguration = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.Development.json");
            var configuration = builderConfiguration.Build();
            var connectionString = configuration.GetConnectionString("DefaultConnection");

            var builder = new DbContextOptionsBuilder<ApplicationDbContext>();
            builder.UseSqlServer(connectionString);

            return new ApplicationDbContext(builder.Options);
        }
    }
}

very nice! thank you!