DialogService.cs

using MongoDBApp.Views;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace MongoDBApp.Services
{
    class DialogService : IDialogService
    {

        Window productView = null;
        ProductView _productView;

        public DialogService()
        {
            _productView = new ProductView();
        }


        public void CloseDetailDialog()
        {

            if (productView != null)
                productView.Close(); 
        }

        public void ShowDetailDialog()
        {
            _productView.ShowDialog();
        }
    }
}