CustomerOrdersViewModel.cs

namespace MongoDBApp.ViewModels
{
    [ImplementPropertyChanged]
    public class CustomerOrdersViewModel 
    {



        public ICommand EditCommand { get; set; }
        private IDialogService _dialogService; 

        public CustomerOrdersViewModel(IDataService<OrderModel> orderDataService, IDialogService dialogservice)
        {

                      
            this._orderDataService = orderDataService;
            this._dialogService = dialogservice;

            LoadCommands();
        }

       
        
        

        #region properties

        public string SelectedCustomerEmail { get; set; }

        public ObservableCollection<OrderModel> CustomerOrders { get; set; }

        public OrderModel SelectedOrder { get; set; }

        public ProductModel SelectedProduct { get; set; }

        public bool IsEnabled { get; set; }
        
       

       
        #endregion



        #region methods

       
       
        private void LoadCommands()
        {
            EditCommand = new CustomCommand(EditOrder, CanModifyOrder);
        }


        
        private bool CanModifyOrder(object obj)
        {

            if (SelectedOrder != null && SelectedOrder.Email != null && SelectedOrder.Date != null &&
                SelectedOrder.Id != null && SelectedProduct != null )
            {
                return true;
            }

            return false;
        }


        private void EditOrder(object obj)
        {
            Messenger.Default.Send<ProductModel>(SelectedProduct);
            _dialogService.ShowDetailDialog();         
        }


        private bool CanLoadWindow(object obj)
        {
            return true;
        }

        private void WindowLoaded(object obj)
        {
            Messenger.Default.Register<ProductModel>(this, OnUpdateProductMessageReceived);
        }


        private void OnUpdateOrderMessageReceived(CustomerModel customer)
        {
            SelectedCustomerEmail = customer.Email;
            LoadCustomerOrdersAsync(SelectedCustomerEmail);
            IsEnabled = true;
          
        }



        


       

        public async Task LoadCustomerOrdersAsync(string email)
        {
            var ordersResult = await _orderDataService.GetAllByEmailAsync(email);
            CustomerOrders = ordersResult.ToObservableCollection();
        }

        

        #endregion

    }
}

OrderModel.cs

using MongoDB.Bson;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MongoDBApp.Models;
using System.Threading.Tasks;
using System.ComponentModel;
using MongoDB.Bson.Serialization.Attributes;
using PropertyChanged;

namespace MongoDBApp.Models
{
    [ImplementPropertyChanged]
    public class OrderModel 
    {

        
        [BsonId]
        public ObjectId Id { get; set; }
        

        [BsonElement("email")]
        public string Email { get; set; }
        

        [BsonElement("date")]
        public BsonDateTime Date { get; set; }
       


        [BsonElement("ship_status")]
        public Boolean Status { get; set; }
        

        [BsonElement("products")]
        public List<ProductModel> Products { get; set; }
      
       
    }


    [ImplementPropertyChanged]
    public class ProductModel
    {


        [BsonElement("productId")]
        public string ProductId { get; set; }

        [BsonElement("price")]
        public float Price { get; set; }

        [BsonElement("description")]
        public string Description { get; set; }

        [BsonElement("quantity")]
        public int Quantity { get; set; }

    }

}

ProductView.xaml

<Window x:Class="MongoDBApp.Views.ProductView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        d:DesignHeight="300"
        d:DesignWidth="300"
        mc:Ignorable="d">

    <ScrollViewer>

        <Grid Margin="5">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="150" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="10" />
                <RowDefinition Height="20" />
                <RowDefinition Height="30" />
                <RowDefinition Height="80" />
                <RowDefinition Height="30" />
                <RowDefinition Height="30" />
                <RowDefinition Height="30" />
                <RowDefinition Height="30" />
            </Grid.RowDefinitions>
            <Label Grid.Row="2"
                   Content="Id"
                   FontWeight="Bold" />
            <TextBox Grid.Row="2"
                     Grid.Column="1"
                     Text="{Binding SelectedProduct.ProductId,
                                    Mode=TwoWay}" />
            <Label Grid.Row="3"
                   VerticalAlignment="Center"
                   Content="Description"
                   FontWeight="Bold" />
            <TextBox Grid.Row="3"
                     Grid.Column="1"
                     Height="75"
                     AcceptsReturn="True"
                     Text="{Binding SelectedProduct.Description,
                                    Mode=TwoWay}" />
            <Label Grid.Row="4"
                   Content="Price"
                   FontWeight="Bold" />
            <TextBox Grid.Row="4"
                     Grid.Column="1"
                     Text="{Binding SelectedProduct.Price,
                                    Mode=TwoWay}" />
            <Label Grid.Row="5"
                   Content="Order amount"
                   FontWeight="Bold" />
            <TextBox Grid.Row="5"
                     Grid.Column="1"
                     Text="{Binding SelectedProduct.Quantity,
                                    Mode=TwoWay}" />


            <StackPanel Grid.Row="9"
                        Grid.ColumnSpan="2"
                        Orientation="Horizontal">

                <Button Margin="5"
                        Command="{Binding SaveCommand}"
                        Content="Save" />
                <Button Margin="5"
                        Command="{Binding DeleteCommand}"
                        Content="Delete" />

            </StackPanel>

        </Grid>
    </ScrollViewer>
</Window>

ProductView.xaml.cs

using MongoDBApp.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace MongoDBApp.Views
{
    /// <summary>
    /// Interaction logic for ProductView.xaml
    /// </summary>
    public partial class ProductView : Window
    {
        private ProductViewModel ViewModel { get; set; }

        public ProductView()
        {
            InitializeComponent();
            ViewModel = new ProductViewModel();
            this.DataContext = ViewModel;

        }
    }
}

ProductViewModel.cs

namespace MongoDBApp.ViewModels
{
    [ImplementPropertyChanged]
    public class ProductViewModel 
    {

        public ProductViewModel()
        {


            Messenger.Default.Register<ProductModel>(this, OnSelectedProductReceived);
           
        }



        #region properties

        public ProductModel SelectedProduct { get; set; }
 
        #endregion



        #region methods

        
        public void OnSelectedProductReceived(ProductModel product)
        {
            SelectedProduct = product;
            
        }

        #endregion


    }
}