public class ProductModel
    {
        public int Id { get; set; }

        [Display(Name = "نام کالا")]
        [Required(ErrorMessage = "{0} یک فیلد اجباری است و باید آن را وارد کنید.")]
        [StringLength(50, ErrorMessage = "طول {0} باید کمتر از {1} کاراکتر باشد.")]
        public string Name { get; set; }

        [Display(Name = "قیمت")]
        [Required(ErrorMessage = "{0} یک فیلد اجباری است و باید آن را وارد کنید.")]
        [DataType(DataType.Currency)]
        public double Price { get; set; }

        [Display(Name = "بارکد")]
        [Required(ErrorMessage = "{0} یک فیلد اجباری است و باید آن را وارد کنید.")]
        [StringLength(50, ErrorMessage = "طول {0} باید کمتر از {1} کاراکتر باشد.")]
        [Remote("IsProductExist", "Product", HttpMethod = "POST", ErrorMessage = "این بارکد از قبل در سیستم وجود دارد.")]
        public string Barcode { get; set; }
    }

        [HttpPost]
        [OutputCache(Location = OutputCacheLocation.None, NoStore = true)]
        public ActionResult IsProductExist(string barcode)
        {
            if (barcode == "123456789") return Json(false); // اگر محصول وجود داشت
            return Json(true);
        }

Install-Package mongocsharpdriver

  public class Author
    {
        public ObjectId Id { get; set; }
        public string Name { get; set; }
    }

public class Language
    {
        public ObjectId Id { get; set; }
        public string Name { get; set; }
    }

  public class Book
    {
        public ObjectId Id { get; set; }
        public string Title { get; set; }
        public string ISBN { get; set; }
        public int Price { get; set; }
        public List<Author> Authors { get; set; }
        public Language Language { get; set; }
    }

           var book =new Book()
           {
               Title = "Gone With Wind",
               ISBN = "43442424",
               Price = 50000,
               Language = new Language()
               {
                  Name = "Persian"
               },
               Authors = new List<Author>()
               {
                   new Author()
                   {
                       Name = "Margaret Mitchell"
                   },
                     new Author()
                   {
                       Name = "Ali Mahboobi (Translator)"
                   },
               }
           };

var client = new MongoClient();

 string connectionString = "mongodb://localhost:27017";
            MongoClientSettings settings = MongoClientSettings.FromUrl(new MongoUrl(connectionString));
            var client = new MongoClient(settings);

var db = client.GetDatabase("publisher");

var collection = db.GetCollection<Book>("books");

collection.InsertOneAsync(book);

       var client = new MongoClient();
            var db = client.GetDatabase("publisher");
            db.DropCollection("books");
            var collection = db.GetCollection<Book>("books");
            
            var book =new Book()
           {
               Title = "Gone With Wind",
               ISBN = "43442424",
               Price = 50000,
               Year = 1936,
               LastStock = DateTime.Now.AddDays(-13),
               Language = new Language()
               {
                  Name = "Persian"
               },
               Authors = new List<Author>()
               {
                   new Author()
                   {
                       Name = "Margaret Mitchell"
                   },
                     new Author()
                   {
                       Name = "Ali Mahboobi (Translator)"
                   },
               }
           };

            var book2 = new Book()
            {
                Title = "Jane Eyre",
                ISBN = "87897897",
                Price = 60000,
                Year = 1847,
                LastStock = DateTime.Now.AddDays(-5),
                Language = new Language()
                {
                    Name = "English"
                },
                Authors = new List<Author>()
               {
                   new Author()
                   {
                       Name = "Charlotte Brontë"
                   },
                   
               }
            };


            var book3 = new Book()
            {
                Title = "White Fang",
                ISBN = "43442424",
                Price = 50000,
                Year = 1936,
                LastStock = DateTime.Now.AddDays(-13),
                Language = new Language()
                {
                    Name = "English"
                },
                Authors = new List<Author>()
               {
                   new Author()
                   {
                       Name = "Jack London"
                   },
                     new Author()
                   {
                       Name = "Philippe Mignon"
                   },
               }
            };

            var book4 = new Book()
            {
                Title = "The Lost Symbol",
                ISBN = "43442424",
                Price = 3500000,
                Year = 2009,
                LastStock = DateTime.Now.AddDays(-17),
                Language = new Language()
                {
                    Name = "Persian"
                },
                Authors = new List<Author>()
               {
                   new Author()
                   {
                       Name = "Dan Brown"
                   },
                     new Author()
                   {
                       Name = "Mehrdad"
                   },
               }
            };

            var book7 = new Book()
            {
                Title = "The Lost Symbol",
                ISBN = "43442424",
                Price = 47000000,
                Year = 2009,
                LastStock = DateTime.Now.AddDays(-56),
                Language = new Language()
                {
                    Name = "Persian"
                },
                Authors = new List<Author>()
               {
                   new Author()
                   {
                       Name = "Dan Brown"
                   },
                     new Author()
                   {
                       Name = "Mehrdad"
                   },
               }
            };
            var book5= new Book()
            {
                Title = "The Help",
                ISBN = "45345e3er3",
                Price = 9000000,
                Year = 2009,
                LastStock = DateTime.Now.AddDays(-2),
                Language = new Language()
                {
                    Name = "Enlish"
                },
                Authors = new List<Author>()
               {
                   new Author()
                   {
                       Name = "Kathryn Stockett"
                   },
                    
               }
            };

            var book6 = new Book()
            {
                Title = "City of Glass",
                ISBN = "454534545",
                Price = 500000,
                Year = 2009,
                LastStock = DateTime.Now,
                Language = new Language()
                {
                    Name = "Persian"
                },
                Authors = new List<Author>()
               {
                   new Author()
                   {
                       Name = "Cassandra Clare"
                   },
                   new Author()
                   {
                       Name = "Ali"
                   },

               }
            };
            var books = new List<Book> {book, book2, book3, book4, book5, book6,book7};

            collection.InsertManyAsync(books);

            var client = new MongoClient();
            var db = client.GetDatabase("publisher");
            var collection = db.GetCollection<Book>("books");
            
            var filter=new BsonDocument();
            var docs = collection.Find(filter).ToList();
            foreach (var book in docs)
            {
                Console.WriteLine(book.Title + " By "+ book.Authors[0].Name);
            }

Gone With Wind By Margaret Mitchell
Jane Eyre By Charlotte Brontë
White Fang By Jack London
The Lost Symbol By Dan Brown
The Help By Kathryn Stockett
City of Glass By Cassandra Clare
The Lost Symbol By Dan Brown

var filter = Builders<Book>.Filter.Eq("Year", 2009);

            var docs = collection.Find(filter).ToList();
            foreach (var book in docs)
            {
                Console.WriteLine(book.Title + " By "+ book.Authors[0].Name);
            }

The Lost Symbol By Dan Brown
The Help By Kathryn Stockett
City of Glass By Cassandra Clare
The Lost Symbol By Dan Brown

   // var filter=new BsonDocument();
            var filterBuilder = Builders<Book>.Filter;
            var filter= filterBuilder.Eq("Year", 2009) | filterBuilder.Gte("Price",700000);

            var docs = collection.Find(filter).ToList();
            foreach (var book in docs)
            {
                Console.WriteLine(book.Title + " By "+ book.Authors[0].Name);
            }

Gone With Wind By Margaret Mitchell
White Fang By Jack London
The Lost Symbol By Dan Brown
The Help By Kathryn Stockett
City of Glass By Cassandra Clare
The Lost Symbol By Dan Brown

var docs = collection.AsQueryable().Where(x => x.Year == 2009 || x.Price <= 50000).ToList();

  var sort = Builders<Book>.Sort.Ascending("Title").Descending("Price");
            var docs = collection.Find(filter).Sort(sort).ToList();
            foreach (var book in docs)
            {
                Console.WriteLine(book.Title + " By "+ book.Authors[0].Name);
            }

City of Glass By Cassandra Clare
Gone With Wind By Margaret Mitchell
The Help By Kathryn Stockett
The Lost Symbol By Dan Brown
The Lost Symbol By Dan Brown
White Fang By Jack London