using System;
using System.Diagnostics;
using System.IO;
using System.Web.UI;

       protected override void SavePageStateToPersistenceMedium(object state)
       {
           if (Debugger.IsAttached)
           {
               using (MemoryStream stream = new MemoryStream())
               {
                   LosFormatter formatter = new LosFormatter();
                   formatter.Serialize(stream, state);
                   int size = stream.Capacity / 1024;
                   if (size > 32)
                   {
                       throw new Exception("لطفا به وضعیت ویوو استیت این صفحه رسیدگی نمائید");
                   }
               }
           }
           base.SavePageStateToPersistenceMedium(state);
       }

public partial class WebForm4 : System.Web.UI.Page

public partial class WebForm4 : MyPage

Controls  00:48:08 
WinRT provides numerous XAML controls, which act as the building blocks of your applications.
Some of these will be familiar, while some are new to Metro. 
Introduction
Command Controls
Demo: Application Bar
Context Menus
Demo: Context Menus
Application Settings
CheckBox, RadioButton, and ToggleSwitch
Progress Controls
Demo: Progress Controls
Displaying Text
Demo: Displaying Text
Text Entry
Sliders
Styling
WebView
UserControl
Summary

List Controls  00:31:14 
This module shows the Metro controls available to XAML applications for working with collections of items.
This includes the new GridView and ListView controls, 
which are optimized for handling collections in a touch-based user interface. 

Introduction
Items Controls
Demo: ListBox vs ListView
Demo: GridView
Demo: FlipView 
Common ItemsControl
Semantic Zoom
Demo: JumpViewer
Summary

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Options;
 
namespace SampleLib
{
  public static class MyServiceCollectionExtensions
  {
   public static void AddMySampleLib(this IServiceCollection services, SmtpConfig configureOptions)
   {
    services.TryAddSingleton(Options.Create(configureOptions));
   }
  }
}

services.AddSwaggerGen(c =>
{
    // ... 
    var security = new Dictionary<string, IEnumerable<string>>
    {
        {"Bearer", new string[] { }},
    }; 
    c.AddSecurityDefinition("Bearer", new ApiKeyScheme
    {
        Description = "JWT Authorization header using the Bearer scheme. Example: \"Authorization: Bearer {token}\"",
        Name = "Authorization",
        In = "header",
        Type = "apiKey"
    });
    c.AddSecurityRequirement(security);
});

<form method="post" asp-action="UploadFiles" asp-controller="Home" enctype="multipart/form-data">
    <input type="file" name="files" webkitdirectory />
    <input type="submit" value="Upload" />
</form>

using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace UploadFolderASPNETCore.Controllers
{
    public class HomeController : Controller
    {
        private readonly IWebHostEnvironment _environment;
        private const int MaxBufferSize = 0x10000;

        public HomeController(IWebHostEnvironment environment)
        {
            _environment = environment;
        }

        public IActionResult Index()
        {
            return View();
        }

        [HttpPost("[action]")]
        public async Task<IActionResult> UploadFiles(IList<IFormFile> files)
        {
            var uploadsRootFolder = Path.Combine(_environment.WebRootPath, "uploads");
            CreateDir(uploadsRootFolder);

            foreach (var file in files)
            {
                var dirPath = Path.GetDirectoryName(file.FileName);
                CreateDir(Path.Combine(uploadsRootFolder, dirPath));

                var filePath = Path.Combine(uploadsRootFolder, file.FileName);
                using (var fileStream = new FileStream(filePath, FileMode.Create,
                                                        FileAccess.Write,
                                                        FileShare.None,
                                                        MaxBufferSize,
                                                        useAsync: true
                                                        ))
                {
                    await file.CopyToAsync(fileStream);
                }
            }

            return RedirectToAction("Index");
        }

        private void CreateDir(string path)
        {
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
        }
    }
}