How to move code from startup to program wehn migrate from .NET core 2.2 to .NET core 5

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SQL

C#7.0

ASP.NET-Core

i work on .net core 2.2  web application 

i found class name start up

now i need to migrate from .net core 2.2 to .net core 5

so i don't found start up 

i found only program class

so how to add my code on start up to program on .net 5

What I have tried:

​


 public class Startup
    {
        private readonly IConfigurationRoot configRoot;
        private AppSettings AppSettings { get; set; }

        public Startup(IConfiguration configuration)
        {
            Log.Logger = new LoggerConfiguration().ReadFrom.Configuration(configuration).CreateLogger();
            Configuration = configuration;

            IConfigurationBuilder builder = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json");
            configRoot = builder.Build();

            AppSettings = new AppSettings();
            Configuration.Bind(AppSettings);
        }

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddController();

            services.AddDbContext(Configuration, configRoot);

            services.AddIdentityService(Configuration);

            services.AddAutoMapper();

            services.AddScopedServices();

            services.AddTransientServices();

            services.AddSwaggerOpenAPI();

            services.AddMailSetting(Configuration);

            services.AddServiceLayer();

            services.AddVersion();

            services.AddHealthCheck(AppSettings, Configuration);

            services.AddFeatureManagement();
        }



        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory log)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseCors(options =>
                 options.WithOrigins("http://localhost:3000")
                 .AllowAnyHeader()
                 .AllowAnyMethod());

            app.ConfigureCustomExceptionMiddleware();

            log.AddSerilog();

            //app.ConfigureHealthCheck();


            app.UseRouting();

            app.UseAuthentication();

            app.UseAuthorization();
            app.ConfigureSwagger();
            app.UseHealthChecks("/healthz", new HealthCheckOptions
            {
                Predicate = _ => true,
                ResponseWriter = UIResponseWriter.WriteHealthCheckUIResponse,
                ResultStatusCodes =
                {
                    [HealthStatus.Healthy] = StatusCodes.Status200OK,
                    [HealthStatus.Degraded] = StatusCodes.Status500InternalServerError,
                    [HealthStatus.Unhealthy] = StatusCodes.Status503ServiceUnavailable,
                },
            }).UseHealthChecksUI(setup =>
              {
                  setup.ApiPath = "/healthcheck";
                  setup.UIPath = "/healthcheck-ui";
                  //setup.AddCustomStylesheet("Customization/custom.css");
              });


            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }



 

i found only program file.cs 

and his code as following

using HealthChecks.UI.Client;
using Microsoft.AspNetCore.Diagnostics.HealthChecks;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.Extensions.Diagnostics.HealthChecks;
using static Microsoft.EntityFrameworkCore.DbLoggerCategory;
//using static Microsoft.EntityFrameworkCore.DbLoggerCategory;


var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorPages();
var app = builder.Build();


if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();

app.UseAuthorization();




app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
});

app.MapRazorPages();

app.Run();


​