using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;

namespace LinqToRSS
{
 public static class LanguageExtender
 {
     public static string SafeValue(this XElement input)
     {
         return (input == null) ? string.Empty : input.Value;
     }

     public static DateTime SafeDateValue(this XElement input)
     {
         return (input == null) ? DateTime.MinValue : DateTime.Parse(input.Value);
     }
 }

 public class RssEntry
 {
     public string Title { set; get; }
     public string Description { set; get; }
     public string Link { set; get; }
     public DateTime PublicationDate { set; get; }
     public string Author { set; get; }
     public string BlogName { set; get; }
     public string BlogAddress { set; get; }
 }

 public class Rss
 {
     static XElement selectDate(XElement date1, XElement date2)
     {
         return date1 ?? date2;
     }

     public static List<RssEntry> GetEntries(string feedUrl)
     {
         //applying namespace in an XElement
         XName xn = XName.Get("{http://purl.org/dc/elements/1.1/}creator");//{namespace}root
         XName xn2 = XName.Get("{http://purl.org/dc/elements/1.1/}date");

         var feed = XDocument.Load(feedUrl);
         if (feed.Root == null) return null;

         var items = feed.Root.Element("channel").Elements("item");
         var feedQuery =
             from item in items
             select new RssEntry
                        {
                            Title = item.Element("title").SafeValue(),
                            Description = item.Element("description").SafeValue(),
                            Link = item.Element("link").SafeValue(),
                            PublicationDate =
                                selectDate(item.Element(xn2), item.Element("pubDate")).SafeDateValue(),
                            Author = item.Element(xn).SafeValue(),
                            BlogName = item.Parent.Element("title").SafeValue(),
                            BlogAddress = item.Parent.Element("link").SafeValue()
                        };

         return feedQuery.ToList();
     }
 }

 class Program
 {
     static void Main(string[] args)
     {
         List<RssEntry> entries = Rss.GetEntries("http://weblogs.asp.net/aspnet-team/rss.aspx");
         if (entries != null)
             foreach (var item in entries)
                 Console.WriteLine(item.Title);

         Console.WriteLine("Press a key...");
         Console.ReadKey();
     }
 }
}

<?xml version="1.0" encoding="UTF-8" ?>
<?xml-stylesheet type="text/xsl" href="http://weblogs.asp.net/utility/FeedStylesheets/rss.xsl" media="screen"?>
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/">
<channel>
 <title>Latest Microsoft Blogs</title>
 <link>http://weblogs.asp.net/aspnet-team/default.aspx</link>
 <description />
 <dc:language>en</dc:language>
 <generator>CommunityServer 2007 SP1 (Build: 20510.895)</generator>
 <item>
   <title>Comments on my recent benchmarks.</title>
   <link>http://misfitgeek.com/blog/aspnet/comments-on-my-recent-benchmarks/</link>
   <pubDate>Mon, 10 Aug 2009 23:33:59 GMT</pubDate>
   <guid isPermaLink="false">c06e2b9d-981a-45b4-a55f-ab0d8bbfdc1c:7166225</guid>
   <dc:creator>Misfit Geek: msft</dc:creator>
   <slash:comments>0</slash:comments>
   <wfw:commentRss xmlns:wfw="http://wellformedweb.org/CommentAPI/">http://weblogs.asp.net/aspnet-team/rsscomments.aspx?PostID=7166225</wfw:commentRss>
   <comments>http://misfitgeek.com/blog/aspnet/comments-on-my-recent-benchmarks/#comments</comments>
   <description>Overall I’ve been pretty impressed ...</description>
   <category domain="http://weblogs.asp.net/aspnet-team/archive/tags/ASP.NET/default.aspx">ASP.NET</category>
 </item>
</channel>
</rss>

var items = feed.Root.Element("channel").Elements("item");

XName.Get("{mynamespace}root");
//or
XName.Get("root", "mynamespace");

public class OrderItem
    {
        public int OrderItemID { get; set; }
        public int Quantity { get; set; }
        public string ItemCode { get; set; }
        public string Description { get; set; }
    }

    public class Order
    {
        public Order()
        {
            Items = new List<OrderItem>();
        }
        public int OrderID { get; set; }        
        public string Description { get; set; }         
        public decimal TotalWeight { get; set; }         
        public string ShippingMethod { get; set; }
        public List<OrderItem> Items { get; set; } 
    }

OrderInfo.ShippingMethod

TotalAmount + (OrderInfo.TotalWeight * 0.50m) 

static void Main(string[] args)
        {
            Order myOrder = new Order
            {
                OrderID = 1,
                Description = "Need some stuff",
                ShippingMethod = "2ndDay",
                TotalWeight = 100
            };
            IDictionary<String, object> input = new Dictionary<String, Object>
            {
                { "OrderInfo",myOrder}
            };
            IDictionary<String, Object> output = WorkflowInvoker.Invoke(new OrderWF(), input);
            Decimal total = (Decimal)output["TotalAmount"];
            Console.WriteLine("Workflow returned ${0} for my order total", total);
            Console.WriteLine("Press ENTER to exit"); 
            Console.ReadLine();

            //Activity workflow1 = new OrderWF();
            //WorkflowInvoker.Invoke(workflow1);
        }

public async Task Sample()
{
    var customers = await GetCustomersFromSomeWhere();

    foreach (var customer in customers)
    {
        await DoSomethingWithCustomer(customer);
    }
}

public async Task Sample()
{
    var customers = await GetCustomersFromSomeWhere();
    await Task.WhenAll(customers.Select(c => DoSomethingWithCustomer(c)));
}

public async Task Sample()
{
    var customers = await GetCustomersFromSomeWhere();

    await customers.Select(c => Observable.FromAsync(() => DoSomethingWithCustomer(c))).Merge(maxConcurrent: 25);
}

public async Task Sample()
{
    var customers = await GetCustomersFromSomeWhere();

    ActionBlock<Customer> action = new ActionBlock<Customer>(c => DoSomethingWithCustomer(c), new ExecutionDataflowBlockOptions
    {
        MaxDegreeOfParallelism = 25
    }); 

    foreach (var customer in customers)
    {
        action.Post(customer);
    }

    action.Complete();

    await action.Completion;
}

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

   <authentication mode="Forms">
     <forms
       …
        name="MyCookieName"
       slidingExpiration="true"
       timeout="43200"
       />
   </authentication>