public interface IPagedQueryModel
    {
        int Page { get; set; }
        int PageSize { get; set; }

        /// <summary>
        ///     Expression of Sorting.
        /// </summary>
        /// <example>
        ///     Examples:
        ///     "Name_ASC"
        /// </example>
        string SortExpression { get; set; }
    }

  public class PagedQueryModel : IPagedQueryModel, IShouldNormalize
    {
        public int Page { get; set; }
        public int PageSize { get; set; }

        /// <summary>
        ///     Expression of Sorting.
        /// </summary>
        /// <example>
        ///     Examples:
        ///     "Name_ASC"
        /// </example>
        public string SortExpression { get; set; }

        public virtual void Normalize()
        {
            if (Page < 1)
                Page = 1;

            if (PageSize < 1)
                PageSize = 10;

            if (SortExpression.IsEmpty())
                SortExpression = "Id_DESC";
        }
    }

    public class PagedQueryResult<TModel>
    {
        public PagedQueryResult()
        {
            Items = new List<TModel>();
        }
        public IEnumerable<TModel> Items { get; set; }
        public long TotalCount { get; set; }
    }

    public class PagedListModel<TModel>
    {
        public IPagedQueryModel Query { get; set; }

        public PagedQueryResult<TModel> Result { get; set; }
    }

    public abstract class CrudApplicationService<TEntity, TModel, TCreateModel, TEditModel, TDeleteModel,
        TPagedQueryModel, TDynamicQueryModel> : ApplicationService,
        ICrudApplicationService<TModel, TCreateModel, TEditModel, TDeleteModel, TPagedQueryModel, TDynamicQueryModel>
        where TEntity : Entity, new()
        where TCreateModel : class
        where TEditModel : class, IModel
        where TModel : class, IModel
        where TDeleteModel : class, IModel
        where TPagedQueryModel : PagedQueryModel, new()
        where TDynamicQueryModel : DynamicQueryModel

    {

        #region Properties

        protected IQueryable<TEntity> UnTrackedEntitySet => EntitySet.AsNoTracking();
        public IUnitOfWork UnitOfWork { get; set; }
        public IMapper Mapper { get; set; }
        protected IDbSet<TEntity> EntitySet => UnitOfWork.Set<TEntity>();

        #endregion

        #region ICrudApplicationService Members

        #region Methods

        public virtual async Task<PagedQueryResult<TModel>> GetPagedListAsync(TPagedQueryModel model)
        {
            Guard.ArgumentNotNull(model, nameof(model));

            var query = ApplyFiltering(model);

            var totalCount = await query.LongCountAsync().ConfigureAwait(false);

            var result = query.ProjectTo<TModel>(Mapper.ConfigurationProvider);

            result = result.ApplySorting(model);
            result = result.ApplyPaging(model);

            return new PagedQueryResult<TModel>
            {
                Items = await result.ToListAsync().ConfigureAwait(false),
                TotalCount = totalCount
            };
        }
        #endregion

        #endregion

        #region Protected Methods

        /// <summary>
        ///     Apply Filtering To GetPagedList and GetPagedListAsync
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        protected virtual IQueryable<TEntity> ApplyFiltering(TPagedQueryModel model)
        {
            Guard.ArgumentNotNull(model, nameof(model));

            return UnTrackedEntitySet;
        }
        #endregion
    }

    public static class QueryableExtensions
    {
        public static IQueryable<TModel> ApplySorting<TModel>(this IQueryable<TModel> query, IPagedQueryModel request)
        {
            Guard.ArgumentNotNull(request, nameof(request));
            Guard.ArgumentNotNull(query, nameof(query));

            return query.OrderBy(request.SortExpression.Replace('_', ' '));
        }

        public static IQueryable<TModel> ApplyPaging<TModel>(this IQueryable<TModel> query, IPagedQueryModel request)
        {
            Guard.ArgumentNotNull(request, nameof(request));
            Guard.ArgumentNotNull(query, nameof(query));

            return request != null
                ? query.Page((request.Page - 1) * request.PageSize, request.PageSize)
                : query;
        }
    }

public partial class RolesController : BaseController
{
    #region Fields
        private readonly IRoleService _service;
        private readonly ILookupService _lookupService;

        #endregion

    #region Constractor
        public RolesController(IRoleService service,  ILookupService lookupService)
        {
            Guard.ArgumentNotNull(service, nameof(service));
            Guard.ArgumentNotNull(lookupService, nameof(lookupService));

            _service = service;
            _lookupService = lookupService;
        }
        #endregion

    #region Index / List
    [HttpGet]
    public virtual async Task<ActionResult> Index()
    {
        var query = new RolePagedQueryModel();
        var result = await _service.GetPagedListAsync(query).ConfigureAwait(false);

        var pagedList = new PagedListModel<RoleModel>
        {
            Query = query,
            Result = result
        };

        var model = new RoleIndexViewModel
        {
            PagedListModel = pagedList,
            Permissions = _lookupService.GetPermissions()
        };
        return View(model);
    }
    [HttpGet, AjaxOnly, NoOutputCache]
    public virtual async Task<ActionResult> List(RolePagedQueryModel query)
    {
        var result = await _service.GetPagedListAsync(query).ConfigureAwait(false);

        var model = new PagedListModel<RoleModel>
        {
            Query = query,
            Result = result
        };

        return PartialView(MVC.Administration.Roles.Views._List, model);
    }
    #endregion
}

    public class RolePagedQueryModel : PagedQueryModel
    {
        public string Name { get; set; }
        public string Permission { get; set; }
    }

    public class RoleIndexViewModel
    {   
        public RoleIndexViewModel()
        {
            Permissions = new List<LookupItem>();
        }
        public IReadOnlyList<LookupItem> Permissions { get; set; }
        public PagedListModel<RoleModel> PagedListModel { get; set; }
    }

@model RoleIndexViewModel

@{
    ViewBag.Title = L("Administration.Views.Role.Index.Title");
    ViewBag.ActiveMenu = AdministrationMenuNames.RoleManagement;
}

<div class="row">
    <div class="col-md-12">
        <div id="filterPanel" class="panel-collapse collapse" role="tabpanel" aria-labelledby="filterPanel">
            <div class="panel panel-default margin-bottom-5">

                <div class="panel-body">
                    @using (Ajax.BeginForm(MVC.Administration.Roles.List(),
new AjaxOptions { UpdateTargetId = "RolesList", HttpMethod = "GET" }, new { id = "filterForm", data_submit_on_reset = "true" }))
                    {
                        <div class="row">
                            <div class="col-md-3">
                                <input type="text" name="Name" class="form-control" value="" placeholder="@L("Administration.Role.Fields.Name")" />
                            </div>
                            <div class="col-md-3">
                                @Html.DropDownList("Permission", Model.Permissions.ToSelectListItems(), L("Administration.Views.Role.FilterBy.Permission"),new {@class="form-control"})
                            </div>
                            <div class="col-md-3">

                                <button type="submit"
                                        role="button"
                                        class="btn btn-info">
                                    @L("Commands.Filter")
                                </button>
                                <button type="reset"
                                        role="button"
                                        class="btn btn-default">
                                    <i class="fa fa-close"></i>
                                    @L("Commands.Reset")
                                </button>
                            </div>
                        </div>
                    }
                </div>
            </div>
        </div>
    </div>
</div>

<div class="row">
    <div class="col-md-12" id="RolesList">
        @{Html.RenderPartial(MVC.Administration.Roles.Views._List, Model.PagedListModel);}
    </div>
</div>

  $(document).on("reset", "form[data-submit-on-reset]",
            function () {
                var form = this;
                setTimeout(function () {
                    $(form).submit();
                });
            });

@model PagedListModel<RoleModel>
@{
    Layout = null;
    var rowNumber = (Model.Query.Page - 1) * Model.Query.PageSize + 1;
    var refreshUrl = Url.Action(MVC.Administration.Roles.List().AddRouteValues(new RouteValueDictionary(Model.Query.ToDictionary())));
}

<div class="panel panel-default margin-bottom-5">
    <table class="table table-bordered table-hover" id="RolesListTable" data-ajax-refresh-url="@refreshUrl" data-ajax-refresh-update="#RolesList">
        <thead>
            <tr>
                <th style="width: 5%;">
                    #
                </th>
                <th class="col-md-3 sortable">
                    @Html.SortableColumn("Name", L("Administration.Role.Fields.Name"), Model.Query, "RolesList", routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)))
                </th>
                <th class="col-md-3 sortable">
                    @Html.SortableColumn("DisplayName", L("Administration.Role.Fields.DisplayName"), Model.Query, "RolesList", routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)))
                </th>
                <th class="col-md-3 sortable">
                    @Html.SortableColumn("IsDefault", L("Administration.Role.Fields.IsDefault"), Model.Query, "RolesList", routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)))
                </th>
               
                <th style="width: 5%;"></th>
            </tr>
        </thead>

        <tbody>
           @foreach (var role in Model.Result.Items)
            {
                <tr>
                    <td>@(rowNumber++.ToPersianNumbers())</td>
                    <td>@role.Name</td>
                    <td>@role.DisplayName</td>
                    <td class="text-center">@Html.DisplayFor(a => role.IsDefault)</td>
                    <td class="text-center operations">
                      
                        <div class="btn-group">

                            <span class="fa fa-ellipsis-h dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"></span>
                            <ul class="dropdown-menu dropdown-menu-left">
                                <li>
                                    <a href="#"
                                       role="button"
                                       data-ajax="true"
                                       data-ajax-method="GET"
                                       data-ajax-update="#main-modal div.modal-content"
                                       data-ajax-url="@Url.Action(MVC.Administration.Roles.Edit(role.Id))"
                                       data-toggle="modal"
                                       data-target="#main-modal">
                                        <i class="fa fa-pencil"></i>
                                        @L("Commands.Edit")
                                    </a>
                                </li>
                                <li>
                                    <a href="#"
                                       role="button"
                                       id="delete-@role.Id"
                                       data-delete-url="@Url.Action(MVC.Administration.Roles.Delete())"
                                       data-delete-model='{"Id":"@role.Id","RowVersion":"@Convert.ToBase64String(role.RowVersion)"}'>
                                        <i class="fa fa-trash"></i>
                                        @L("Commands.Delete")
                                    </a>
                                </li>
                            </ul>
                        </div>
                    </td>
                </tr>
            }
        </tbody>
    </table>

</div>

<div class="row">
    <div class="col-md-8">
        @Html.Pager(Model, "RolesList", routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)))
        @Html.PageSize("RolesList", Model.Query, routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)), new { @class = "margin-right-5" }, "filterForm")
        @Html.Refresh("RolesList", Model.Query, routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)), L("Commands.Refresh"))
    </div>
</div>

    var refreshUrl = Url.Action(MVC.Administration.Roles.List().AddRouteValues(new RouteValueDictionary(Model.Query.ToDictionary())));

<table class="table table-bordered table-hover" id="RolesListTable" data-ajax-refresh-url="@refreshUrl" data-ajax-refresh-update="#RolesList">

<th class="col-md-3 sortable">
    @Html.SortableColumn("Name", L("Administration.Role.Fields.Name"), Model.Query, "RolesList", routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)))
</th>

        public static MvcHtmlString SortableColumn(this HtmlHelper html, string columnName,
            string columnDisplayName, IPagedQueryModel queryModel, string updateTargetId, Func<RouteValueDictionary, string> urlFactory)
        {
            var dictionary = queryModel.ToDictionary();

            var routeValueDictionary = new RouteValueDictionary(dictionary)
            {
                ["SortExpression"] = !queryModel.SortExpression.StartsWith(columnName)
                    ? $"{columnName}_DESC" : queryModel.SortExpression.EndsWith("DESC")
                        ? $"{columnName}_ASC" : queryModel.SortExpression.EndsWith("ASC")
                            ? string.Empty : $"{columnName}_DESC"
            };

            var url = urlFactory(routeValueDictionary);

            var aTag = new TagBuilder("a");
            aTag.Attributes.Add("href", "#");
            aTag.Attributes.Add("data-ajax", "true");
            aTag.Attributes.Add("data-ajax-method", "GET");
            aTag.Attributes.Add("data-ajax-update", updateTargetId.StartsWith("#") ? updateTargetId : $"#{updateTargetId}");
            aTag.Attributes.Add("data-ajax-url", url);
            aTag.InnerHtml = columnDisplayName;

            var iconCssClass = !queryModel.SortExpression.StartsWith(columnName)
                ? "fa-sort"
                : queryModel.SortExpression.EndsWith("DESC")
                    ? "fa-sort-down"
                    : "fa-sort-up";

            var iTag = new TagBuilder("i");
            iTag.AddCssClass($"fa {iconCssClass}");

            return new MvcHtmlString($"{aTag}\n{iTag}");
        }

public static IDictionary<string, object> ToDictionary(this object source)
{
    return source.ToDictionary<object>();
}

public static IDictionary<string, T> ToDictionary<T>(this object source)
{
    if (source == null)
        throw new ArgumentNullException(nameof(source));

    var dictionary = new Dictionary<string, T>();

    foreach (PropertyDescriptor property in TypeDescriptor.GetProperties(source))
    {
        AddPropertyToDictionary(property, source, dictionary);
    }
    return dictionary;
}

private static void AddPropertyToDictionary<T>(PropertyDescriptor property, object source,
    IDictionary<string, T> dictionary)
{
    var value = property.GetValue(source);

    var items = value as IEnumerable;

    if (items != null && !(items is string))
    {
        var i = 0;
        foreach (var item in items)
        {
            dictionary.Add($"{property.Name}[{i++}]", (T)item);
        }
    }
    else if (value is T)
    {
        dictionary.Add(property.Name, (T)value);
    }

}

var routeValueDictionary = new RouteValueDictionary(dictionary)
{
    ["SortExpression"] = !queryModel.SortExpression.StartsWith(columnName)
        ? $"{columnName}_DESC" : queryModel.SortExpression.EndsWith("DESC")
            ? $"{columnName}_ASC" : queryModel.SortExpression.EndsWith("ASC")
                ? string.Empty : $"{columnName}_DESC"
};

<div class="row">
    <div class="col-md-8">
        @Html.Pager(Model, "RolesList", routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)))
        @Html.PageSize("RolesList", Model.Query, routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)), new { @class = "margin-right-5" }, "filterForm")
        @Html.Refresh("RolesList", Model.Query, routeValueDictionary => Url.Action(MVC.Administration.Roles.List().AddRouteValues(routeValueDictionary)), L("Commands.Refresh"))
    </div>
</div>

public static MvcHtmlString Pager<TModel>(this HtmlHelper html, PagedListModel<TModel> model,
        string updateTargetId, Func<RouteValueDictionary, string> urlFactory)
{
    return html.PagedListPager(
        new StaticPagedList<TModel>(model.Result.Items, model.Query.Page, model.Query.PageSize,
            (int)model.Result.TotalCount), page =>
       {
           var dictionary = model.Query.ToDictionary();
           var routeValueDictionary = new RouteValueDictionary(dictionary) { ["Page"] = page };
           return urlFactory(routeValueDictionary);
       }, PagedListRenderOptions.EnableUnobtrusiveAjaxReplacing(
            new PagedListRenderOptions
            {
                DisplayLinkToFirstPage = PagedListDisplayMode.Always,
                DisplayLinkToLastPage = PagedListDisplayMode.Always,
                DisplayLinkToPreviousPage = PagedListDisplayMode.Always,
                DisplayLinkToNextPage = PagedListDisplayMode.Always,
                MaximumPageNumbersToDisplay = 6,
                DisplayItemSliceAndTotal = true,
                DisplayEllipsesWhenNotShowingAllPageNumbers = true,
                ItemSliceAndTotalFormat = $"تعداد کل: {model.Result.TotalCount.ToPersianNumbers()}",
                FunctionToDisplayEachPageNumber = page => page.ToPersianNumbers(),
            },
            new AjaxOptions
            {
                AllowCache = false,
                HttpMethod = "GET",
                InsertionMode = InsertionMode.Replace,
                UpdateTargetId = updateTargetId
            }));
}

public static MvcHtmlString PageSize(this HtmlHelper html, string updateTargetId, IPagedQueryModel queryModel, Func<RouteValueDictionary, string> urlFactory, object htmlAttributes = null, string filterFormId = null, params int[] numbers)
{
    if (numbers.Length == 0)
        numbers = new[] { 10, 20, 30, 50, 100 };

    var dictionary = queryModel.ToDictionary();

    var routeValueDictionary = new RouteValueDictionary(dictionary)
    {
        [nameof(IPagedQueryModel.Page)] = 1
    };
    routeValueDictionary.Remove(nameof(IPagedQueryModel.PageSize));

    var url = urlFactory(routeValueDictionary);

    var formTag = new TagBuilder("form");
    formTag.Attributes.Add("action", url);
    formTag.Attributes.Add("method", "GET");
    formTag.Attributes.Add("data-ajax", "true");
    formTag.Attributes.Add("data-ajax-method", "GET");
    formTag.Attributes.Add("data-ajax-update", updateTargetId.StartsWith("#") ? updateTargetId : $"#{updateTargetId}");
    formTag.Attributes.Add("data-ajax-url", url);

    if (htmlAttributes != null)
        formTag.MergeAttributes(HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));

    formTag.AddCssClass("form-inline inline");

    var items = numbers.Select(number =>
        new SelectListItem
        {
            Value = number.ToString(),
            Text = number.ToString().ToPersianNumbers(),
            Selected = queryModel.PageSize == number
        });

    formTag.InnerHtml = html.DropDownList(nameof(IPagedQueryModel.PageSize), items, new { @class = "form-control page-size", onchange = "$(this.form).submit();" }).ToString();

    if (filterFormId.IsEmpty()) return new MvcHtmlString($"{formTag}");

    // ReSharper disable once MustUseReturnValue
    var scriptBlock = $"<script type=\"text/javascript\"> if(window.jQuery){{$('form#{filterFormId}').find('input[name=\"{nameof(IPagedQueryModel.PageSize)}\"]').remove();\n $('form#{filterFormId}').append(\"<input type='hidden' name='{nameof(IPagedQueryModel.PageSize)}' value='{queryModel.PageSize}'/>\")}}</script>";

    return new MvcHtmlString($"{formTag}\n{scriptBlock}");
}

    formTag.InnerHtml = html.DropDownList(nameof(IPagedQueryModel.PageSize), items, new { @class = "form-control page-size", onchange = "$(this.form).submit();" }).ToString();

  var scriptBlock = $"<script type=\"text/javascript\"> if(window.jQuery){{$('form#{filterFormId}').find('input[name=\"{nameof(IPagedQueryModel.PageSize)}\"]').remove();\n $('form#{filterFormId}').append(\"<input type='hidden' name='{nameof(IPagedQueryModel.PageSize)}' value='{queryModel.PageSize}'/>\")}}</script>";

public static MvcHtmlString Refresh(this HtmlHelper html, string updateTargetId, IPagedQueryModel queryModel,
    Func<RouteValueDictionary, string> urlFactory, string label = null)
{
    var dictionary = queryModel.ToDictionary();

    var routeValueDictionary = new RouteValueDictionary(dictionary);

    var url = urlFactory(routeValueDictionary);

    var aTag = new TagBuilder("a");
    aTag.Attributes.Add("href", "#");
    aTag.Attributes.Add("role", "button");
    aTag.Attributes.Add("data-ajax", "true");
    aTag.Attributes.Add("data-ajax-method", "GET");
    aTag.Attributes.Add("data-ajax-update", updateTargetId.StartsWith("#") ? updateTargetId : $"#{updateTargetId}");
    aTag.Attributes.Add("data-ajax-url", url);
    aTag.AddCssClass("btn btn-default");

    var iTag = new TagBuilder("i");
    iTag.AddCssClass("fa fa-refresh");

    aTag.InnerHtml = $"{iTag} {label}";

    return new MvcHtmlString(aTag.ToString());
}

/// <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>
    /// 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 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
    }