private MongoDB.Document CreateDocument(ProductSales productSales)
        {
            var document = new MongoDB.Document();
            document.Add("product-id", productSales.ProductId);
            document.Add("product-name", productSales.ProductName);
            document.Add("vendor-name", productSales.VendorName);
            document.Add("total-quantity-sold", productSales.TotalQuantitySold);
            document.Add("total-incomes", productSales.TotalIncome);

            return document;
        }
 private BsonDocument CreateBson(ProductSales productSales)
 {
     var document = new BsonDocument
     {
         { "product-id" , productSales.ProductId },
         { "product-name" , productSales.ProductName },
         { "vendor-name" , productSales.VendorName },
         { "total-quantity-sold" , productSales.TotalQuantitySold },
         { "total-incomes" , productSales.TotalIncome }
     };
     return document;
 }