using System;

namespace ActionFuncSamples
{
    public delegate int AddMethodDelegate(int a);
    public class DelegateSample
    {
        public void UseDelegate(AddMethodDelegate addMethod)
        {
            Console.WriteLine(addMethod(5));
        }
    }

    public class Helper
    {
        public int CustomAdd(int a)
        {
            return ++a;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Helper helper = new Helper();

            // .NET 1            
            AddMethodDelegate addMethod = new AddMethodDelegate(helper.CustomAdd);
            new DelegateSample().UseDelegate(addMethod);

            // .NET 2, anonymous delegates
            new DelegateSample().UseDelegate(delegate(int a) { return helper.CustomAdd(a); });

            // .NET 3.5
            new DelegateSample().UseDelegate(a => helper.CustomAdd(a));
        }
    }
}

Action<int> example1 = x => Console.WriteLine("Write {0}", x);
example1(5);

Func<int, string> example2 = x => string.Format("{0:n0}", x);
Console.WriteLine(example2(5000));

using System;

namespace ActionFuncSamples
{
    public interface ISchedule
    {
        void Run();
    }

    public class Runner
    {
        public void Exceute(ISchedule schedule)
        {
            schedule.Run();
        }
    }

    public class HelloSchedule : ISchedule
    {
        public void Run()
        {
            Console.WriteLine("Just Run!");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            new Runner().Exceute(new HelloSchedule());
        }
    }
}

using System;

namespace ActionFuncSamples
{
    public class Schedule
    {
        public void Exceute(Action run)
        {
            run();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            new Schedule().Exceute(() => Console.WriteLine("Just Run!"));
        }
    }
}

var json = JsonConvert.SerializeObject(obj, new JsonSerializerSettings
{
   ContractResolver = new CamelCasePropertyNamesContractResolver()
});

using Newtonsoft.Json;

namespace JsonNetTests
{
    public enum Color
    {
        Red,
        Green,
        Blue,
        White
    }

    public class Item
    {
        public string Name { set; get; }
        public Color Color { set; get; }
    }

    public class EnumTests
    {
        public string GetJson()
        {
            var item = new Item
            {
                Name = "Item 1",
                Color = Color.Blue 
            };

            return JsonConvert.SerializeObject(item, Formatting.Indented);
        }
    }
}

{
  "Name": "Item 1",
  "Color": 2
}

  [JsonConverter(typeof(StringEnumConverter))]
  public Color Color { set; get; }

return JsonConvert.SerializeObject(item, new JsonSerializerSettings
{
   Formatting = Formatting.Indented,
   Converters = { new StringEnumConverter() }
});

   public class Category
    {
        public int Id { get; set; }
        public string Name { get; set; }

        public virtual ICollection<Product> Products { get; set; }

        public Category()
        {
            Products = new List<Product>();
        }
    }

    public class Product
    {
        public int Id { get; set; }
        public string Name { get; set; }

        public virtual Category Category { get; set; }
    }

using System.Collections.Generic;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;

namespace JsonNetTests
{
    public class SelfReferencingLoops
    {
        public string GetJson()
        {
            var category = new Category
            {
                Id = 1,
                Name = "Category 1"
            };
            var product = new Product
            {
                Id = 1,
                Name = "Product 1"
            };

            category.Products.Add(product);
            product.Category = category;

            return JsonConvert.SerializeObject(category, new JsonSerializerSettings
            {
                Formatting = Formatting.Indented,
                Converters = { new StringEnumConverter() }
            });
        }
    }
}

 An unhandled exception of type 'Newtonsoft.Json.JsonSerializationException' occurred in Newtonsoft.Json.dll
Additional information: Self referencing loop detected for property 'Category' with type 'JsonNetTests.Category'. Path 'Products[0]'.

return JsonConvert.SerializeObject(category, new JsonSerializerSettings
{
   Formatting = Formatting.Indented,
   ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
   Converters = { new StringEnumConverter() }
});

return JsonConvert.SerializeObject(category, new JsonSerializerSettings
{
   Formatting = Formatting.Indented,
   PreserveReferencesHandling = PreserveReferencesHandling.Objects,
   Converters = { new StringEnumConverter() }
});

{
  "$id": "1",
  "Id": 1,
  "Name": "Category 1",
  "Products": [
    {
      "$id": "2",
      "Id": 1,
      "Name": "Product 1",
      "Category": {
        "$ref": "1"
      }
    }
  ]
}

// Create a graphics object for drawing.
Graphics gfxCaptchaImage = Graphics.FromImage(bitmap);

gfxCaptchaImage.PageUnit = GraphicsUnit.Pixel;
gfxCaptchaImage.SmoothingMode = SmoothingMode.HighQuality;
gfxCaptchaImage.Clear(Color.White);

// Create a Random Number from 1000 to 9999
int salt = CaptchaHelpers.CreateSalt();

public int CreateSalt()
{
   Random random = new Random();
   return random.Next(1000, 9999);
}

HttpContext.Current.Session["captchastring"] = salt;

string randomString = (salt).NumberToText(Language.Persian);

// Set up the text format.
var format = new StringFormat();
int faLCID = new System.Globalization.CultureInfo("fa-IR").LCID;
format.SetDigitSubstitution(faLCID, StringDigitSubstitute.National);
format.Alignment = StringAlignment.Near;
format.LineAlignment = StringAlignment.Near;
format.FormatFlags = StringFormatFlags.DirectionRightToLeft;

// Font of Captcha and its size
Font font = new Font("Tahoma", 10);

// Create a path for text 
GraphicsPath path = new GraphicsPath();

path.AddString(randomString, 
                font.FontFamily, 
                (int)font.Style, 
                (gfxCaptchaImage.DpiY * font.SizeInPoints / 72), 
                new Rectangle(0, 0, width, height), format);

gfxCaptchaImage.DrawPath(Pens.Navy, path);

//-- using a sin ware distort the image
int distortion = random.Next(-10, 10);
using (Bitmap copy = (Bitmap)bitmap.Clone())
{
          for (int y = 0; y < height; y++)
          {
              for (int x = 0; x < width; x++)
              {
                  int newX = (int)(x + (distortion * Math.Sin(Math.PI * y / 64.0)));
                  int newY = (int)(y + (distortion * Math.Cos(Math.PI * x / 64.0)));
                  if (newX < 0 || newX >= width) newX = 0;
                 if (newY < 0 || newY >= height) newY = 0;
                 bitmap.SetPixel(x, y, copy.GetPixel(newX, newY));
              }
         }
 }

//-- Draw the graphic to the bitmap
gfxCaptchaImage.DrawImage(bitmap, new Point(0, 0));

gfxCaptchaImage.Flush();

HttpResponseBase response = context.HttpContext.Response;
response.ContentType = "image/jpeg";
bitmap.Save(response.OutputStream, ImageFormat.Jpeg);

// Clean up.
font.Dispose();
gfxCaptchaImage.Dispose();
bitmap.Dispose();

public CaptchaImageResult CaptchaImage()
{
     return new CaptchaImageResult();
}

<img src="@Url.Action("CaptchaImage")"/>

[HttpPost]
public ActionResult Index(LogOnModel model)
{
      if (!ModelState.IsValid) return View(model);

      if (model.CaptchaInputText == Session["captchastring"].ToString()) 
             TempData["message"] = "تصویر امنتی را صحیح وارد کرده اید";
      else 
             TempData["message"] = "تصویر امنیتی را اشتباه وارد کرده اید";

      return View();
}

static async IAsyncEnumerable<int> RangeAsync(int start, int count)
{
  for (int i = 0; i < count; i++)
  {
    await Task.Delay(i);
    yield return start + i;
  }
}

    [ApiController]
    [Route("[controller]")]
    public class CustomerController : ControllerBase
    {
        private readonly IDictionary<int, Customer> _customers;
        private void FillCustomerFromMemory(int countOfCustomer)
        {
            for (int CustomerId = 1; CustomerId <= countOfCustomer; CustomerId++)
            {
                _customers.Add(key: CustomerId, new Customer($"name_{CustomerId}", CustomerId));
            }
        }
        public CustomerController()
        {
            _customers = new Dictionary<int, Customer>();
            FillCustomerFromMemory(countOfCustomer : 100);
        }
        [HttpGet]
        public async Task<IEnumerable<Customer>> Get()
        {
            var output = new List<Customer>();
            while (_customers.Any(_ => _.Key % 10 == 0))
            {
                var customer = _customers.First(_ => _.Key % 10 == 0);
                output.Add(new Customer(customer.Value.Name, customer.Key));
                await Task.Delay(500);
                _customers.Remove(customer);
            }
            return output;
        }

        public class Customer
        {
            public int Id { get; private set; }

            public string Name { get; private set; }
            public Customer(string name, int id)
            {
                Name = name;
                Id = id;
            }
        }
    }

  [HttpGet]
        public async IAsyncEnumerable<Customer> Get()
        {
            while (_customers.Any(_ => _.Key % 10 == 0))
            {
                var customer = _customers.First(_ => _.Key % 10 == 0);
                yield return new Customer(customer.Value.Name, customer.Key);
                _customers.Remove(customer);
                await Task.Delay(500);
            }
        }

const int TARGET = 80;
var _httpClient = new HttpClient();
using (var response = await _httpClient.GetAsync(
    "https://localhost:7284/customer",
     HttpCompletionOption.ResponseHeadersRead))
{
    var stream = await response.Content.ReadAsStreamAsync();

    var _jsonSerializerSettings = new JsonSerializerSettings();
    var _serializer = Newtonsoft.Json.JsonSerializer.Create(_jsonSerializerSettings);

    using TextReader textReader = new StreamReader(stream);
    using JsonReader jsonReader = new JsonTextReader(textReader);

    await using (stream.ConfigureAwait(false))
    {
        await jsonReader.ReadAsync().ConfigureAwait(false);
        while (await jsonReader.ReadAsync().ConfigureAwait(false) &&
               jsonReader.TokenType != JsonToken.EndArray)
        {
            Customer customer = _serializer!.Deserialize<Customer>(jsonReader);
            if (customer.Id == TARGET)
            {
                Console.WriteLine(customer.Id + " : " + customer.Name);
                break;
            }
        }
    }
}

[HttpGet]
        public async IAsyncEnumerable<Customer> Get(CancellationToken cancellationToken)
        {
            while (!cancellationToken.IsCancellationRequested && _customers.Any(_ => _.Key % 10 == 0))
            {
                var customer = _customers.First(_ => _.Key % 10 == 0);
                yield return new Customer(customer.Value.Name, customer.Key);
                _customers.Remove(customer);
                await Task.Delay(500,cancellationToken);
            }
        }

const int TARGET = 80;
var _httpClient = new HttpClient();
var _cancelationTokenSource = new CancellationTokenSource();

using (var response = await _httpClient.GetAsync(
    "https://localhost:7284/customer",
     HttpCompletionOption.ResponseHeadersRead,
     _cancelationTokenSource.Token))
{
    var stream = await response.Content.ReadAsStreamAsync(_cancelationTokenSource.Token);

    var _jsonSerializerSettings = new JsonSerializerSettings();
    var _serializer = Newtonsoft.Json.JsonSerializer.Create(_jsonSerializerSettings);

    using TextReader textReader = new StreamReader(stream);
    using JsonReader jsonReader = new JsonTextReader(textReader);

    await using (stream.ConfigureAwait(false))
    {
        await jsonReader.ReadAsync(_cancelationTokenSource.Token).ConfigureAwait(false);
        while (await jsonReader.ReadAsync(_cancelationTokenSource.Token).ConfigureAwait(false) &&
               jsonReader.TokenType != JsonToken.EndArray)
        {
            Customer customer = _serializer!.Deserialize<Customer>(jsonReader);
            if (customer.Id == TARGET)
            {
                Console.WriteLine(customer.Id + " : " + customer.Name);
                _cancelationTokenSource.Cancel();
                break;
            }
        }
    }
}

 PM> Install-Package PostSharp

using System;

namespace AOP03
{
    public class MyType
    {
        public void DoSomething(string data, int i)
        {
            Console.WriteLine("DoSomething({0}, {1});", data, i);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            new MyType().DoSomething("Test", 1);
        }
    }
}

using System;
using PostSharp.Aspects;

namespace AOP03
{
    [Serializable]
    public class LoggingAspect : OnMethodBoundaryAspect
    {
        public override void OnEntry(MethodExecutionArgs args)
        {
            Console.WriteLine("On Entry");
        }

        public override void OnExit(MethodExecutionArgs args)
        {
            Console.WriteLine("On Exit");
        }

        public override void OnSuccess(MethodExecutionArgs args)
        {
            Console.WriteLine("On Success");
        }

        public override void OnException(MethodExecutionArgs args)
        {
            Console.WriteLine("On Exception");
        }
    }
}

    public class MyType
    {
        [LoggingAspect]
        public void DoSomething(string data, int i)
        {
            Console.WriteLine("DoSomething({0}, {1});", data, i);
        }
    }

 On Entry
DoSomething(Test, 1);
On Success
On Exit

public void DoSomething(string data, int i)
{
    <>z__Aspects.a0.OnEntry(null);
    try
    {
        Console.WriteLine("DoSomething({0}, {1});", data, i);
        <>z__Aspects.a0.OnSuccess(null);
    }
    catch (Exception)
    {
        <>z__Aspects.a0.OnException(null);
        throw;
    }
    finally
    {
        <>z__Aspects.a0.OnExit(null);
    }
}

 [Serializable]
[MulticastAttributeUsage(MulticastTargets.Method, TargetMemberAttributes = MulticastAttributes.Instance)]
public class LoggingAspect : OnMethodBoundaryAspect

 [assembly: LoggingAspect(AttributeTargetTypes = "AOP03.*")]

• سلمان معروفی 

/// <summary>
    /// Represents the lable 
    /// </summary>
    public class Tag
    {
        #region Ctor
        /// <summary>
        /// Create one instance of <see cref="Tag"/>
        /// </summary>
        public Tag()
        {
            Id = SequentialGuidGenerator.NewSequentialGuid();
        }
        #endregion

        #region Properties
        /// <summary>
        /// sets or gets Tag's identifier
        /// </summary>
        public virtual Guid  Id { get; set; }
        /// <summary>
        /// sets or gets Tag's name
        /// </summary>
        public virtual string Name { get; set; }
        #endregion

        #region NavigationProperties
        /// <summary>
        /// sets or gets Tag's posts
        /// </summary>
        public virtual ICollection<BlogPost> BlogPosts { get; set; }
        #endregion
    }

  /// <summary>
    /// Represents the Post's Draft
    /// </summary>
    public  class BlogDraft
    {
        #region Ctor
        /// <summary>
        /// create one instance of <see cref="BlogDraft"/>
        /// </summary>
        public  BlogDraft()
        {
            Id = SequentialGuidGenerator.NewSequentialGuid();
        }
        #endregion

        #region Properties
        /// <summary>
        /// gets or sets Id of post's draft
        /// </summary>
        public virtual  Guid Id { get; set; }
        /// <summary>
        /// gets or sets body of post's draft
        /// </summary>
        public virtual  string Body { get; set; }
        /// <summary>
        /// gets or set title of post's draft
        /// </summary>
        public virtual  string Title { get; set; }
        /// <summary>
        /// gets or sets tags of post's draft that seperated using ','
        /// </summary>
        public virtual  string TagNames { get; set; }
        /// <summary>
        /// gets or sets value indicating whether this draft is ready to publish
        /// </summary>
        public virtual  bool IsReadyForPublish { get; set; }
        /// <summary>
        /// ges ro sets DateTime that this draft added
        /// </summary>
        public virtual  DateTime CreatedOn { get; set; }
        /// <summary>
        /// gets or sets information of User-Agent
        /// </summary>
        public virtual string Agent { get; set; }
        /// <summary>
        /// gets or sets date that this draft publish as ready
        /// </summary>
        public virtual DateTime? ReadyForPublishOn { get; set; }
        #endregion

        #region NavigationProperties
        /// <summary>
        /// gets or sets Id of user that he is owner of this draft
        /// </summary>
        public virtual  long OwnerId { get; set; }
        /// <summary>
        /// gets or sets user that he is owner of this draft
        /// </summary>
        public virtual  User Owner { get; set; }
        #endregion
    }

/// <summary>
    /// Section of Rating
    /// </summary>
    public enum RatingSection
    {
        News,
        Announcement,
        ForumTopic,
        BlogComment,
        NewsComment,
        PollComment,
        AnnouncementComment,
        ForumPost,
        ...
    }


    /// <summary>
    /// Represents Rating Record regard by section type for Rating System
    /// </summary>
    public class UserRating
    {
        #region Ctor
        /// <summary>
        /// Create one instance of <see cref="UserRating"/>
        /// </summary>
        public UserRating()
        {
            Id = SequentialGuidGenerator.NewSequentialGuid();
        }
        #endregion

        #region Properties
        /// <summary>
        /// gets or sets Id of Rating Record
        /// </summary>
        public virtual Guid Id { get; set; }
        /// <summary>
        /// gets or sets value of rate
        /// </summary>
        public virtual double RatingValue { get; set; }
        /// <summary>
        /// gets or sets Section's Id 
        /// </summary>
        public virtual long SectionId { get; set; }
        /// <summary>
        /// gets or sets Section 
        /// </summary>
        public virtual RatingSection Section { get; set; }
        #endregion

        #region Navigation Properties
        /// <summary>
        /// gets or sets user that rate one section
        /// </summary>
        public virtual User Rater { get; set; }
        /// <summary>
        /// gets or sets Rater Id that rate one section
        /// </summary>
        public virtual long RaterId { get; set; }

        #endregion
    }

/// <summary>
    /// Represent the rating as ComplexType
    /// </summary>
    [ComplexType]
    public class Rating
    {
        /// <summary>
        /// sets or gets total of rating
        /// </summary>
        public virtual double? TotalRating { get; set; }
        /// <summary>
        /// sets or gets rater's count
        /// </summary>
        public virtual long? RatersCount { get; set; }
        /// <summary>
        /// sets or gets average of rating
        /// </summary>
        public virtual double? AverageRating { get; set; }
    }

/// <summary>
    /// Represents a base class for every content in system
    /// </summary>
    public abstract class BaseContent
    {
        #region Properties

        /// <summary>
        /// get or set identifier of record
        /// </summary>
        public virtual long Id { get; set; }
        /// <summary>
        /// gets or sets date of publishing content
        /// </summary>
        public virtual DateTime PublishedOn { get; set; }
        /// <summary>
        /// gets or sets Last Update's Date
        /// </summary>
        public virtual DateTime ModifiedOn { get; set; }
        /// <summary>
        /// gets or sets the blog pot body
        /// </summary>
        public virtual string Body { get; set; }
        /// <summary>
        /// gets or sets the content title
        /// </summary>
        public virtual string Title { get; set; }
        /// <summary>
        /// gets or sets value  indicating Custom Slug
        /// </summary>
        public virtual string SlugUrl { get; set; }
        /// <summary>
        /// gets or sets meta title for seo
        /// </summary>
        public virtual string MetaTitle { get; set; }
        /// <summary>
        /// gets or sets meta keywords for seo
        /// </summary>
        public virtual string MetaKeywords { get; set; }
        /// <summary>
        /// gets or sets meta description of the content
        /// </summary>
        public virtual string MetaDescription { get; set; }
        /// <summary>
        /// gets or sets 
        /// </summary>
        public virtual string FocusKeyword { get; set; }
        /// <summary>
        /// gets or sets value indicating whether the content use CanonicalUrl
        /// </summary>
        public virtual bool UseCanonicalUrl { get; set; }
        /// <summary>
        /// gets or sets CanonicalUrl That the Post Point to it
        /// </summary>
        public virtual string CanonicalUrl { get; set; }
        /// <summary>
        /// gets or sets value indicating whether the content user no Follow for Seo
        /// </summary>
        public virtual bool UseNoFollow { get; set; }
        /// <summary>
        /// gets or sets value indicating whether the content user no Index for Seo
        /// </summary>
        public virtual bool UseNoIndex { get; set; }
        /// <summary>
        /// gets or sets value indicating whether the content in sitemap
        /// </summary>
        public virtual bool IsInSitemap { get; set; }
        /// <summary>
        /// gets or sets a value indicating whether the content comments are allowed 
        /// </summary>
        public virtual bool AllowComments { get; set; }
        /// <summary>
        /// gets or sets a value indicating whether the content comments are allowed for anonymouses 
        /// </summary>
        public virtual bool AllowCommentForAnonymous { get; set; }
        /// <summary>
        /// gets or sets  viewed count by rss
        /// </summary>
        public virtual long ViewCountByRss { get; set; }
        /// <summary>
        /// gets or sets viewed count 
        /// </summary>
        public virtual long ViewCount { get; set; }
        /// <summary>
        /// Gets or sets the total number of  comments
        /// <remarks>The same as if we run Item.Comments.where(a=>a.Status==Status.Approved).Count()
        /// We use this property for performance optimization (no SQL command executed)
        /// </remarks>
        /// </summary>
        public virtual int ApprovedCommentsCount { get; set; }
        /// <summary>
        /// Gets or sets the total number of  comments
        /// <remarks>The same as if we run Item.Comments.where(a=>a.Status==Status.UnApproved).Count()
        /// We use this property for performance optimization (no SQL command executed)</remarks></summary>
        public virtual int UnApprovedCommentsCount { get; set; }
        /// <summary>
        /// gets or sets value  indicating whether the content is logical deleted or hidden
        /// </summary>
        public virtual bool IsDeleted { get; set; }
        /// <summary>
        /// gets or sets rating complex instance
        /// </summary>
        public virtual Rating Rating { get; set; }
        /// <summary>
        /// gets or sets value indicating whether the content show with rssFeed
        /// </summary>
        public virtual bool ShowWithRss { get; set; }
        /// <summary>
        /// gets or sets value indicating maximum days count that users can send comment
        /// </summary>
        public virtual int DaysCountForSupportComment { get; set; }
        /// <summary>
        /// gets or sets information of User-Agent
        /// </summary>
        public virtual string Agent { get; set; }
        /// <summary>
        /// gets or sets icon name with size 200*200 px for snippet 
        /// </summary>
        public virtual string SocialSnippetIconName { get; set; }
        /// <summary>
        /// gets or sets title for snippet
        /// </summary>
        public virtual string SocialSnippetTitle { get; set; }
        /// <summary>
        /// gets or sets description for snippet
        /// </summary>
        public virtual string SocialSnippetDescription { get; set; }
        /// <summary>
        /// gets or sets body of content's comment
        /// </summary>
        public virtual byte[] RowVersion { get; set; }
        /// <summary>
        /// gets or sets name of tags seperated by comma that assosiated with this content fo increase performance
        /// </summary>
        public virtual string TagNames { get; set; }
        /// <summary>
        /// gets or sets counter for Content's report
        /// </summary>
        public virtual int ReportsCount { get; set; }
        #endregion

        #region NavigationProperties

        /// <summary>
        /// get or set user that create this record
        /// </summary>
        public virtual User Author { get; set; }

        /// <summary>
        /// gets or sets Id of user that create this record
        /// </summary>
        public virtual long AuthorId { get; set; }
        /// <summary>
        /// get or set  the tags integrated with content
        /// </summary>
        public virtual ICollection<Tag> Tags { get; set; }
        #endregion

    }

 /// <summary>
    /// Represents link for implemention linkback
    /// </summary>
    public class LinkBack
    {

        #region Ctor
        /// <summary>
        /// create one instance of <see cref="LinkBack"/>
        /// </summary>
        public LinkBack()
        {
            CreatedOn = DateTime.Now;
            Id = SequentialGuidGenerator.NewSequentialGuid();
        }
        #endregion

        #region Properties
        /// <summary>
        /// gets or sets link's Id
        /// </summary>
        public virtual Guid Id { get; set; }
        /// <summary>
        /// gets or sets text for show Link
        /// </summary>
        public virtual string Title { get; set; }
        /// <summary>
        /// gets or sets link's address 
        /// </summary>
        public virtual string Url { get; set; }
        /// <summary>
        /// gets or set value indicating whether this link is internal o external
        /// </summary>
        public virtual LinkBackType Type { get; set; }
        /// <summary>
        /// gets or sets date that this record is added
        /// </summary>
        public virtual DateTime CreatedOn { get; set; }
        #endregion

        #region NavigationProperties
        /// <summary>
        /// gets or sets Post that associated
        /// </summary>
        public virtual BlogPost Post { get; set; }
        /// <summary>
        /// gets or sets id of Post that associated
        /// </summary>
        public virtual long PostId { get; set; }
        #endregion
    }


 /// <summary>
    /// represents Type of ReferrerLinks
    /// </summary>
    public enum LinkBackType
    {
        /// <summary>
        /// Internal link
        /// </summary>
        Internal,
        /// <summary>
        /// External Link
        /// </summary>
        External
    }

  /// <summary> 
    /// Represents a blog post
    /// </summary>
    public  class BlogPost : BaseContent
    {
        #region Ctor
        /// <summary>
        /// Create one Instance of <see cref="BlogPost"/>
        /// </summary>
        public BlogPost()
        {
            Rating = new Rating();
            PublishedOn = DateTime.Now;
        }
        #endregion

       #region Properties
        /// <summary>
        /// gets or sets Status of LinkBack Notifications
        /// </summary>
        public virtual LinkBackStatus LinkBackStatus { get; set; }
        #endregion

        #region NavigationProperties

        /// <summary>
        /// get or set  blog post's Reviews
        /// </summary>
        public virtual ICollection<BlogComment> Comments { get; set; }
        /// <summary>
        /// get or set collection of links that reference to this blog post
        /// </summary>
        public virtual ICollection<LinkBack> LinkBacks { get; set; }
        /// <summary>
        /// get or set Collection of Users that Contribute on this post
        /// </summary>
        public virtual ICollection<User> Contributors  { get; set; }
        
        #endregion
    }


  /// <summary>
    /// Represents Status for ReferrerLinks
    /// </summary>
    public enum  LinkBackStatus
    {
        [Display(Name ="غیرفعال")]
        Disable,
        [Display(Name = "فعال")]
        Enable,
        [Display(Name = "لینک‌ها داخلی")]
        JustInternal,
        [Display(Name = "لینک‌ها خارجی")]
        JustExternal
    }

  /// <summary>
    /// Represents a base class for every comment in system 
    /// </summary>

    public abstract class BaseComment
    {
        #region Properties
        /// <summary>
        /// get or set identifier of record
        /// </summary>
        public virtual long Id { get; set; }
        /// <summary>
        /// gets or sets date of creation 
        /// </summary>
        public virtual DateTime CreatedOn { get; set; }
        /// <summary>
        /// gets or sets displayName of this comment's Creator if  he/she is Anonymous
        /// </summary>
        public virtual string CreatorDisplayName { get; set; }
        /// <summary>
        /// gets or sets body of blog post's comment
        /// </summary>
        public virtual string Body { get; set; }
        /// <summary>
        /// gets or sets body of blog post's comment
        /// </summary>
        public virtual Rating Rating { get; set; }
        /// <summary>
        /// gets or sets informations of agent
        /// </summary>
        public virtual string UserAgent { get; set; }
        /// <summary>
        /// gets or sets siteUrl of Creator if he/she is Anonymous
        /// </summary>
        public virtual string SiteUrl { get; set; }
        /// <summary>
        /// gets or sets Email of Creator if he/she is anonymous
        /// </summary>
        public virtual string Email { get; set; }
        /// <summary>
        /// gets or sets status of comment
        /// </summary>
        public virtual CommentStatus Status { get; set; }
        /// <summary>
        /// gets or sets Ip Address of Creator
        /// </summary>
        public virtual string CreatorIp { get; set; }
        /// <summary>
        /// gets or sets datetime that is modified
        /// </summary>
        public virtual DateTime? ModifiedOn { get; set; }
        /// <summary>
        /// gets or sets counter for report this comment
        /// </summary>
        public virtual int ReportsCount { get; set; }
        #endregion

        #region NavigationProperties

        /// <summary>
        /// get or set user that create this record
        /// </summary>
        public virtual User Creator { get; set; }

        /// <summary>
        /// get or set Id of user that create this record
        /// </summary>
        public virtual long? CreatorId { get; set; }
        #endregion
    }

public enum CommentStatus
    {
        /* 0 - approved, 1 - pending, 2 - spam, -1 - trash */
        [Display(Name = "تأیید شده")]
        Approved = 0,
        [Display(Name = "در انتظار بررسی")]
        Pending = 1,
        [Display(Name = "جفنگ")]
        Spam = 2,
        [Display(Name = "زباله دان")]
        Trash = -1
    }

/// <summary>
    /// Represents a blog post's comment
    /// </summary>
    public class BlogComment : BaseComment
    {
        #region Ctor
        /// <summary>
        /// Create One Instance for <see cref="BlogComment"/>
        /// </summary>
        public BlogComment()
        {
            Rating = new Rating();
            CreatedOn = DateTime.Now;
        }
        #endregion

        #region NavigationProperties
        /// <summary>
        /// gets or sets BlogComment's identifier for Replying and impelemention self referencing
        /// </summary>
        public virtual long? ReplyId { get; set; }
        /// <summary>
        /// gets or sets blog's comment for Replying and impelemention self referencing
        /// </summary>
        public virtual BlogComment Reply { get; set; }
        /// <summary>
        /// get or set collection of blog's comment for Replying and impelemention self referencing
        /// </summary>
        public virtual ICollection<BlogComment> Children { get; set; }
        /// <summary>
        /// gets or sets post that this comment sent to it
        /// </summary>
        public virtual BlogPost Post { get; set; }
        /// <summary>
        /// gets or sets post'Id that this comment sent to it
        /// </summary>
        public virtual long PostId { get; set; }
        #endregion
    }

using StructureMap;
using StructureMap.Configuration.DSL;
using SoCPatterns.Layered.Repository;
using SoCPatterns.Layered.Model;

namespace SoCPatterns.Layered.WebUI
{
    public class BootStrapper
    {
        public static void ConfigureStructureMap()
        {
            ObjectFactory.Initialize(x => x.AddRegistry<ProductRegistry>());
        }
    }
    public class ProductRegistry : Registry
    {
        public ProductRegistry()
        {
            For<IProductRepository>().Use<ProductRepository>();
        }
    }
}

namespace SoCPatterns.Layered.WebUI
{
    public class Global : System.Web.HttpApplication
    {
        protected void Application_Start(object sender, EventArgs e)
        {
            BootStrapper.ConfigureStructureMap();
        }
    }
}

namespace SoCPatterns.Layered.WinUI
{
    static class Program
    {
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            BootStrapper.ConfigureStructureMap();
            Application.Run(new Form1());
        }
    }
}

<asp:DropDownList AutoPostBack="true" ID="ddlCustomerType" runat="server">
    <asp:ListItem Value="0">Standard</asp:ListItem>
    <asp:ListItem Value="1">Trade</asp:ListItem>
</asp:DropDownList>
<asp:Label ID="lblErrorMessage" runat="server" ></asp:Label>
<asp:Repeater ID="rptProducts" runat="server" >
    <HeaderTemplate>
        <table>
            <tr>
                <td>Name</td>
                <td>RRP</td>
                <td>Selling Price</td>
                <td>Discount</td>
                <td>Savings</td>
            </tr>
            <tr>
                <td colspan="5"><hr /></td>
            </tr>
    </HeaderTemplate>
    <ItemTemplate>
            <tr>
                <td><%# Eval("Name") %></td>
                <td><%# Eval("RRP")%></td>
                <td><%# Eval("SellingPrice") %></td>
                <td><%# Eval("Discount") %></td>
                <td><%# Eval("Savings") %></td>
            </tr>
    </ItemTemplate>
    <FooterTemplate>
        </table>
    </FooterTemplate>
</asp:Repeater>

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
    this.cmbCustomerType = new System.Windows.Forms.ComboBox();
    this.dgvProducts = new System.Windows.Forms.DataGridView();
    this.colName = new System.Windows.Forms.DataGridViewTextBoxColumn();
    this.colRrp = new System.Windows.Forms.DataGridViewTextBoxColumn();
    this.colSellingPrice = new System.Windows.Forms.DataGridViewTextBoxColumn();
    this.colDiscount = new System.Windows.Forms.DataGridViewTextBoxColumn();
    this.colSavings = new System.Windows.Forms.DataGridViewTextBoxColumn();
    ((System.ComponentModel.ISupportInitialize)(this.dgvProducts)).BeginInit();
    this.SuspendLayout();
    //
    // cmbCustomerType
    //
    this.cmbCustomerType.DropDownStyle =                                                                                                                                                                             System.Windows.Forms.ComboBoxStyle.DropDownList;
    this.cmbCustomerType.FormattingEnabled = true;
    this.cmbCustomerType.Items.AddRange(new object[] {
        "Standard",
        "Trade"});
    this.cmbCustomerType.Location = new System.Drawing.Point(12, 90);
    this.cmbCustomerType.Name = "cmbCustomerType";
    this.cmbCustomerType.Size = new System.Drawing.Size(121, 21);
    this.cmbCustomerType.TabIndex = 3;
    //
    // dgvProducts
    //
    this.dgvProducts.ColumnHeadersHeightSizeMode =     System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
    this.dgvProducts.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
    this.colName,
    this.colRrp,
    this.colSellingPrice,
    this.colDiscount,
    this.colSavings});
    this.dgvProducts.Location = new System.Drawing.Point(12, 117);
    this.dgvProducts.Name = "dgvProducts";
    this.dgvProducts.Size = new System.Drawing.Size(561, 206);
    this.dgvProducts.TabIndex = 2;
    //
    // colName
    //
    this.colName.DataPropertyName = "Name";
    this.colName.HeaderText = "Product Name";
    this.colName.Name = "colName";
    this.colName.ReadOnly = true;
    //
    // colRrp
    //
    this.colRrp.DataPropertyName = "Rrp";
    this.colRrp.HeaderText = "RRP";
    this.colRrp.Name = "colRrp";
    this.colRrp.ReadOnly = true;
    //
    // colSellingPrice
    //
    this.colSellingPrice.DataPropertyName = "SellingPrice";
    this.colSellingPrice.HeaderText = "Selling Price";
    this.colSellingPrice.Name = "colSellingPrice";
    this.colSellingPrice.ReadOnly = true;
    //
    // colDiscount
    //
    this.colDiscount.DataPropertyName = "Discount";
    this.colDiscount.HeaderText = "Discount";
    this.colDiscount.Name = "colDiscount";
    //
    // colSavings
    //
    this.colSavings.DataPropertyName = "Savings";
    this.colSavings.HeaderText = "Savings";
    this.colSavings.Name = "colSavings";
    this.colSavings.ReadOnly = true;
    //
    // Form1
    //
    this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
    this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
    this.ClientSize = new System.Drawing.Size(589, 338);
    this.Controls.Add(this.cmbCustomerType);
    this.Controls.Add(this.dgvProducts);
    this.Name = "Form1";
    this.Text = "Form1";
    ((System.ComponentModel.ISupportInitialize)(this.dgvProducts)).EndInit();
    this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.ComboBox cmbCustomerType;
private System.Windows.Forms.DataGridView dgvProducts;
private System.Windows.Forms.DataGridViewTextBoxColumn colName;
private System.Windows.Forms.DataGridViewTextBoxColumn colRrp;
private System.Windows.Forms.DataGridViewTextBoxColumn colSellingPrice;
private System.Windows.Forms.DataGridViewTextBoxColumn colDiscount;
private System.Windows.Forms.DataGridViewTextBoxColumn colSavings;

using System;
using System.Collections.Generic;
using SoCPatterns.Layered.Model;
using SoCPatterns.Layered.Presentation;
using SoCPatterns.Layered.Service;
using StructureMap;

namespace SoCPatterns.Layered.WebUI
{
    public partial class Default : System.Web.UI.Page, IProductListView
    {
        private ProductListPresenter _productListPresenter;
        protected void Page_Init(object sender, EventArgs e)
        {
            _productListPresenter = new ProductListPresenter(this,ObjectFactory.GetInstance<Service.ProductService>());
            this.ddlCustomerType.SelectedIndexChanged +=
                delegate { _productListPresenter.Display(); };
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            if(!Page.IsPostBack)
                _productListPresenter.Display();
        }
        public void Display(IList<ProductViewModel> products)
        {
            rptProducts.DataSource = products;
            rptProducts.DataBind();
        }
        public CustomerType CustomerType
        {
            get { return (CustomerType) int.Parse(ddlCustomerType.SelectedValue); }
        }
        public string ErrorMessage
        {
            set
            {
                lblErrorMessage.Text =
                    String.Format("<p><strong>Error:</strong><br/>{0}</p>", value);
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using SoCPatterns.Layered.Model;
using SoCPatterns.Layered.Presentation;
using SoCPatterns.Layered.Service;
using StructureMap;

namespace SoCPatterns.Layered.WinUI
{
    public partial class Form1 : Form, IProductListView
    {
        private ProductListPresenter _productListPresenter;
        public Form1()
        {
            InitializeComponent();
            _productListPresenter =
                new ProductListPresenter(this, ObjectFactory.GetInstance<Service.ProductService>());
            this.cmbCustomerType.SelectedIndexChanged +=
                delegate { _productListPresenter.Display(); };
            dgvProducts.AutoGenerateColumns = false;
            cmbCustomerType.SelectedIndex = 0;
        }
        public void Display(IList<ProductViewModel> products)
        {
            dgvProducts.DataSource = products;
        }
        public CustomerType CustomerType
        {
            get { return (CustomerType)cmbCustomerType.SelectedIndex; }
        }
        public string ErrorMessage
        {
            set
            {
                MessageBox.Show(
                    String.Format("Error:{0}{1}", Environment.NewLine, value));
            }
        }
    }
}