/// <summary>
    /// 
    /// </summary>
    public class CompanyModel
    {
        /// <summary>
        /// Table Identity
        /// </summary>
        public int Id { get; set; }

        /// <summary>
        /// Company Name
        /// </summary>
        [DisplayName("نام شرکت")]
        public string CompanyName { get; set; }

        /// <summary>
        /// Company Abbreviation
        /// </summary>
        [DisplayName("نام اختصاری شرکت")]
        public string CompanyAbbr { get; set; }
    
    }

 /// <summary>
    /// 
    /// </summary>
    public static class PropertyExtensions
    {
        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="expression"></param>
        /// <returns></returns>
        public static MemberInfo GetMember<T>(this Expression<Func<T, object>> expression)
        {
            var mbody = expression.Body as MemberExpression;

            if (mbody != null) return mbody.Member;
            //This will handle Nullable<T> properties.
            var ubody = expression.Body as UnaryExpression;
            if (ubody != null)
            {
                mbody = ubody.Operand as MemberExpression;
            }
            if (mbody == null)
            {
                throw new ArgumentException("Expression is not a MemberExpression", "expression");
            }
            return mbody.Member;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="expression"></param>
        /// <returns></returns>
        public static string PropertyName<T>(this Expression<Func<T, object>> expression)
        {
            return GetMember(expression).Name;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="expression"></param>
        /// <returns></returns>
        public static string PropertyDisplay<T>(this Expression<Func<T, object>> expression)
        {
            var propertyMember = GetMember(expression);
            var displayAttributes = propertyMember.GetCustomAttributes(typeof(DisplayNameAttribute), true);
            return displayAttributes.Length == 1 ? ((DisplayNameAttribute)displayAttributes[0]).DisplayName : propertyMember.Name;
        }
    }

public static string PropertyName<T>(this Expression<Func<T, object>> expression)

public static string PropertyDisplay<T>(this Expression<Func<T, object>> expression)

• M مخفف  Model می‌باشد و کار مدیریت داده‌ها را بر عهده دارد.
• V مخفف View  می‌باشد و وظیفه‌ی نمایش داده‌ها به کاربر را بر عهده دارد.
• C  مخفف  Controller می‌باشد و پل ارتباطی بین Model و  View می‌باشد و مدیریت درخواست‌ها را بر عهده دارد.

*,
*::before,
*::after {
  box-sizing: border-box
}

html {
  color: #444;
}

#root {
  max-width: 450px;
  margin: 2rem auto;
  padding: 0 1rem;
}

form {
  display: flex;
  margin-bottom: 2rem;
}

[type="text"],
button {
  display: inline-block;
  -webkit-appearance: none;
  padding: .5rem 1rem;
  border: 2px solid #ccc;
  border-radius: 4px;
}

button {
  cursor: pointer;
  background: #007bff;
  color: white;
  border: 2px solid #007bff;
  margin: 0 .5rem;
}

[type="text"] {
  width: 100%;
}

[type="text"]:active,
[type="text"]:focus {
  outline: 0;
  border: 2px solid #007bff;
}

[type="checkbox"] {
  margin-right: 1rem;
}

h1 {
  color: #222;
}

ul {
  padding: 0;
}

li {
  display: flex;
  align-items: center;
  padding: 1rem;
  margin-bottom: 1rem;
  background: #f4f4f4;
  border-radius: 4px;
}

li span {
  display: inline-block;
  padding: .5rem;
  width: 250px;
  border-radius: 4px;
  border: 2px solid transparent;
}

li span:hover {
  background: rgba(179, 215, 255, 0.52);
}

li span:focus {
  outline: 0;
  border: 2px solid #007bff;
  background: rgba(179, 207, 255, 0.52)
}

class View {
    constructor() {}

    // ایجاد یک المنت با کلاسهای استایل دلخواه
    createElement(tag, className) {
        const element = document.createElement(tag)
        if (className) element.classList.add(className)

        return element
    }

    // DOM انتخاب و گرفتن آیتمی خاص از 
    getElement(selector) {
        const element = document.querySelector(selector)

        return element
    }
}

get _todoText() {
  return this.input.value
}

_resetInput() {
  this.input.value = ''
}

  displayTodos(todos) {
    // حذف تمام نودها
    while (this.todoList.firstChild) {
      this.todoList.removeChild(this.todoList.firstChild)
    }

    // اگر هیچ آیتمی در آرایه نبود این پاراگراف با متن پیش فرض نمایش داده میشود
    if (todos.length === 0) {
      const p = this.createElement('p')
      p.textContent = 'Nothing to do! Add a task?'
      this.todoList.append(p)
    } else {
      // وعناصرمربوطه را ایجاد میکند liاگه درون آرایه آیتمی قرار دارد پس به ازای آن یک عنصر 
      todos.forEach(todo => {
        const li = this.createElement('li')
        li.id = todo.id

        const checkbox = this.createElement('input')
        checkbox.type = 'checkbox'
        checkbox.checked = todo.complete

        const span = this.createElement('span')
        span.contentEditable = true
        span.classList.add('editable')

        if (todo.complete) {
          const strike = this.createElement('s')
          strike.textContent = todo.text
          span.append(strike)
        } else {
          span.textContent = todo.text
        }

        const deleteButton = this.createElement('button', 'delete')
        deleteButton.textContent = 'Delete'
        li.append(checkbox, span, deleteButton)

        // نود ایجاد شده به لیست اضافه میکند
        this.todoList.append(li)
      })
    }

    // برای خطایابی و نمایش در کنسول
    console.log(todos)
  }

class Controller {
  constructor(model, view) {
    this.model = model
    this.view = view

    // نمایش اطلاعات پیش فرض
    this.onTodoListChanged(this.model.todos)
  }

  onTodoListChanged = todos => {
    this.view.displayTodos(todos)
  }
}

handleAddTodo = todoText => {
  this.model.addTodo(todoText)
}

handleEditTodo = (id, todoText) => {
  this.model.editTodo(id, todoText)
}

handleDeleteTodo = id => {
  this.model.deleteTodo(id)
}

handleToggleTodo = id => {
  this.model.toggleTodo(id)
}

bindAddTodo(handler) {
  this.form.addEventListener('submit', event => {
    event.preventDefault()

    if (this._todoText) {
      handler(this._todoText)
      this._resetInput()
    }
  })
}

bindDeleteTodo(handler) {
  this.todoList.addEventListener('click', event => {
    if (event.target.className === 'delete') {
      const id = parseInt(event.target.parentElement.id)

      handler(id)
    }
  })
}

bindToggleTodo(handler) {
  this.todoList.addEventListener('change', event => {
    if (event.target.type === 'checkbox') {
      const id = parseInt(event.target.parentElement.id)

      handler(id)
    }
  })
}

this.view.bindAddTodo(this.handleAddTodo)
this.view.bindDeleteTodo(this.handleDeleteTodo)
this.view.bindToggleTodo(this.handleToggleTodo)

 this.todos = JSON.parse(localStorage.getItem('todos')) || []

_commit(todos) {
  this.onTodoListChanged(todos)
  localStorage.setItem('todos', JSON.stringify(todos))
}

deleteTodo(id) {
  this.todos = this.todos.filter(todo => todo.id !== id)

  this._commit(this.todos)
}

public class Category
{
    public int CategoryId { set; get; }
    public string CategoryName { set; get; }
 
    [JsonIgnore]
    public IList<Product> Products { set; get; }
}


public class Product
{
    public int ProductId { set; get; }
    public string ProductName { set; get; }
}

using System.Linq;
using System.Text;
using System.Web.Mvc;
using KendoUI12.Models;
using Newtonsoft.Json;
 
namespace KendoUI12.Controllers
{
 
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View(); // shows the page.
        }
 
        [HttpGet]
        public ActionResult GetCategories()
        {
            return new ContentResult
            {
                Content = JsonConvert.SerializeObject(CategoriesDataSource.Items),
                ContentType = "application/json",
                ContentEncoding = Encoding.UTF8
            };
        }
 
        [HttpGet]
        public ActionResult GetProducts(int categoryId)
        {
 
            var products = CategoriesDataSource.Items
                            .Where(category => category.CategoryId == categoryId)
                            .SelectMany(category => category.Products)
                            .ToList();
 
            return new ContentResult
            {
                Content = JsonConvert.SerializeObject(products),
                ContentType = "application/json",
                ContentEncoding = Encoding.UTF8
            };
        }
    }
}

<!--نحوه‌ی راست به چپ سازی -->
<div class="k-rtl k-header demo-section">
    <label for="categories">گروه‌ها: </label><input id="categories" style="width: 270px" />
    <label for="products">محصولات: </label><input id="products" disabled="disabled" style="width: 270px" />
</div>
 
@section JavaScript
{
    <script type="text/javascript">
        $(function () {
            $("#categories").kendoDropDownList({
                optionLabel: "انتخاب گروه...",
                dataTextField: "CategoryName",
                dataValueField: "CategoryId",
                dataSource: {
                    transport: {
                        read: {
                            url: "@Url.Action("GetCategories", "Home")",
                            dataType: "json",
                            contentType: 'application/json; charset=utf-8',
                            type: 'GET'
                        }
                    }
                }
            });
 
            $("#products").kendoDropDownList({
                autoBind: false, // won’t try and read from the DataSource when it first loads
                cascadeFrom: "categories", // the id of the DropDown you want to cascade from
                optionLabel: "انتخاب محصول...",
                dataTextField: "ProductName",
                dataValueField: "ProductId",
                dataSource: {
                    // When the serverFiltering is disabled, then the combobox will not make any additional requests to the server.
                    serverFiltering: true, // the DataSource will send filter values to the server
                    transport: {
                        read: {
                            url: "@Url.Action("GetProducts", "Home")",
                            dataType: "json",
                            contentType: 'application/json; charset=utf-8',
                            type: 'GET',
                            data: function () {
                                return { categoryId: $("#categories").val() };
                            }
                        }
                    }
                }
            });
        });
    </script>
 
    <style scoped>
        .demo-section {
            width: 100%;
            height: 100px;
        }
    </style>
}

@page "/hotel/rooms"

@if (Rooms is not null && Rooms.Any())
{

}
else
{
    <div style="position:fixed;top:50%;left:50%;margin-top:-50px;margin-left:-100px;">
        <img src="images/loader.gif" />
    </div>
}

@code {
    IEnumerable<HotelRoomDTO> Rooms = new List<HotelRoomDTO>();
    // ... 
}

  <body>
    <div id="app">
      <div
        style="
          position: fixed;
          top: 50%;
          left: 50%;
          margin-top: -50px;
          margin-left: -100px;
        "
      >
        <img src="images/ajax-loader.gif" />
      </div>
    </div>

namespace BlazorServer.Models
{
    public class HotelRoomDTO
    {
        // ...

        public int TotalDays { get; set; }
        public decimal TotalAmount { get; set; }
    }
}

@code
{
     HomeVM HomeModel = new HomeVM();
    // ...

    private async Task LoadRoomsAsync()
    {
        Rooms = await HotelRoomService.GetHotelRoomsAsync(HomeModel.StartDate, HomeModel.EndDate);
        foreach (var room in Rooms)
        {
            room.TotalAmount = room.RegularRate * HomeModel.NoOfNights;
            room.TotalDays = HomeModel.NoOfNights;
        }
    }
}

@if (Rooms is not null && Rooms.Any())
{
    <EditForm Model="HomeModel" OnValidSubmit="SaveBookingInfo" class="bg-light">
        <div class="pt-3 pb-2 px-5 mx-1 mx-md-0 bg-secondary">
            <DataAnnotationsValidator />
            <div class="row px-3 mx-3">
                <div class="col-6 col-md-4">
                    <div class="form-group">
                        <label class="text-warning">Check in Date</label>
                        <InputDate @bind-Value="HomeModel.StartDate" class="form-control" />
                    </div>
                </div>
                <div class="col-6 col-md-4">
                    <div class="form-group">
                        <label class="text-warning">Check Out Date</label>
                        <input @bind="HomeModel.EndDate" disabled="disabled"
                            readonly="readonly" type="date" class="form-control" />
                    </div>
                </div>
                <div class=" col-4 col-md-2">
                    <div class="form-group">
                        <label class="text-warning">No. of nights</label>
                        <select class="form-control" @bind="HomeModel.NoOfNights">
                            <option value="Select" selected disabled="disabled">(Select No. Of Nights)</option>
                            @for (var i = 1; i <= 10; i++)
                            {
                                <option value="@i">@i</option>
                            }
                        </select>
                    </div>
                </div>

                <div class="col-8 col-md-2">
                    <div class="form-group" style="margin-top: 1.9rem !important;">
                        @if (IsProcessing)
                        {
                            <button class="btn btn-success btn-block form-control">
                                <i class="fa fa-spin fa-spinner"></i>Processing...
                            </button>
                        }
                        else
                        {
                            <input type="submit" value="Update" class="btn btn-success btn-block form-control" />
                        }
                    </div>
                </div>
            </div>
        </div>
    </EditForm>

@code {
    bool IsProcessing;

    // ...

    private async Task SaveBookingInfo()
    {
        IsProcessing = true;
        HomeModel.EndDate = HomeModel.StartDate.AddDays(HomeModel.NoOfNights);
        await LocalStorage.SetItemAsync(ConstantKeys.LocalInitialBooking, HomeModel);
        await LoadRoomsAsync();
        IsProcessing = false;
    }
}

@foreach (var room in Rooms)
{
            <div class="row p-2 my-3 " style="border-radius:20px; border: 1px solid gray">
                <div class="col-12 col-lg-3 col-md-4">
                    <div id="carouselExampleIndicators_@room.Id"
                        class="carousel slide mb-4 m-md-3 m-0 pt-3 pt-md-0"
                        data-ride="carousel">
                        <ol class="carousel-indicators">
                            @{
                                int imageIndex = 0;
                                int innerImageIndex = 0;
                            }
                            @foreach (var image in room.HotelRoomImages)
                            {
                                if (imageIndex == 0)
                                {
                                    <li data-target="#carouselExampleIndicators_@room.Id"
                                        data-slide-to="@imageIndex" class="active"></li>

                                }
                                else
                                {
                                    <li data-target="#carouselExampleIndicators_@room.Id"
                                        data-slide-to="@imageIndex"></li>
                                }
                                imageIndex++;
                            }
                        </ol>
                        <div class="carousel-inner">
                            @foreach (var image in room.HotelRoomImages)
                            {
                                var imageUrl = $"{ImagesBaseAddress}/{image.RoomImageUrl}";
                                if (innerImageIndex == 0)
                                {
                                    <div class="carousel-item active">
                                        <img class="d-block w-100" style="border-radius:20px;"
                                            src="@imageUrl" alt="First slide">
                                    </div>
                                }
                                else
                                {
                                    <div class="carousel-item">
                                        <img class="d-block w-100" style="border-radius:20px;"
                                            src="@imageUrl" alt="First slide">
                                    </div>
                                }

                                innerImageIndex++;
                            }
                        </div>
                        <a class="carousel-control-prev" href="#carouselExampleIndicators_@room.Id"
                            role="button" data-slide="prev">
                            <span class="carousel-control-prev-icon" aria-hidden="true"></span>
                            <span class="sr-only">Previous</span>
                        </a>
                        <a class="carousel-control-next" href="#carouselExampleIndicators_@room.Id"
                            role="button" data-slide="next">
                            <span class="carousel-control-next-icon" aria-hidden="true"></span>
                            <span class="sr-only">Next</span>
                        </a>
                    </div>
                </div>
}

var imageUrl = $"{ImagesBaseAddress}/{image.RoomImageUrl}";

@code {
   string ImagesBaseAddress = "https://localhost:5006";

@foreach (var room in Rooms)
{
                <div class="col-12 col-lg-9 col-md-8">
                    <div class="row pt-3">
                        <div class="col-12 col-lg-8">
                            <p class="card-title text-warning" style="font-size:xx-large">@room.Name</p>
                            <p class="card-text">
                                @((MarkupString)room.Details)
                            </p>
                        </div>
                        <div class="col-12 col-lg-4">
                            <div class="row pb-3 pt-2">
                                <div class="col-12 col-lg-11 offset-lg-1">
                                    <a href="@($"hotel/room-details/{room.Id}")" class="btn btn-success btn-block">Book</a>
                                </div>
                            </div>
                            <div class="row ">
                                <div class="col-12 pb-5">
                                    <span class="float-right">
                                        <span class="float-right">Occupancy : @room.Occupancy adults </span><br />
                                        <span class="float-right pt-1">Room Size : @room.SqFt sqft</span><br />
                                        <h4 class="text-warning font-weight-bold pt-4">
                                            <span style="border-bottom:1px solid #ff6a00">
                                                @room.TotalAmount.ToString("#,#.00;(#,#.00#)")
                                            </span>
                                        </h4>
                                        <span class="float-right">Cost for  @room.TotalDays nights</span>
                                    </span>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
}

      <asp:ScriptManager runat="server" ID="scMan1">
          <CompositeScript>
              <Scripts>
                  <asp:ScriptReference Path="~/flash_detect.js" />
                  <asp:ScriptReference Path="~/jquery.min.js"  />
              </Scripts>
          </CompositeScript>
      </asp:ScriptManager>

<script src="/ScriptResource.axd?d=cAKulKR-axYxbFwMRvm-IlAnHOZjn3-BvtfYzmKItFijWImCOZdjuDVGIFvqZLFX0" type="text/javascript"></script>

• - کم شدن رفت و برگشت‌ها به سرور. به این صورت مرورگر تنها یکبار درخواست دریافت اسکریپت فوق را به سرور ارسال می‌کند و نه چندین بار به ازای هر یک از اسکریپت‌های سایت.

• - کش شدن خودکار اسکریپت‌ حاصل. (هدرهای لازم اضافه می‌شوند)

• - اگر مرورگر HTTP compression را پشتیبانی کند، نتیجه حاصل GZip شده ارائه می‌گردد.