Linq Group By Hierarchy

The LINQ Query. The GROUP BY clause is used with the SQL SELECT statement. cs file ===== using System; using System. The following examples show how to group data in various ways: By a single property. LinkedIn is the world's largest business network, helping professionals like Marco Russo discover inside connections to recommended job candidates, industry experts, and business partners. However, we don't want to merely wrap each segment and element up with angle brackets, we'd like to have some meaningful structure. Look how simple is write the follow SQL Query in LINQ C#: With SQL: select city from students group by city order by city Now in LINQ C#: from student in Students group student. The second edition of this acclaimed guide provi. Retrieve Salary by country along with grand total There are several ways to achieve this. But, nesting ngRepeats is fairly straightforward if you take on the. Or in other words, we can say that the grouping operator returns the group of elements based on the given key. NET programming model which expresses computation as queries on streams of objects. Projection operators provides cross joins and non equi joins like functionality. The LINQ GroupBy method offers grouping of data passing defining a key-selector to group the data. However nongeneric collections like the ArrayList do not implement the 'generic' IEnumerable interface. Can you show in a diagram what you want that grouping to look like or what you need it to look like. Unless we tell it not to, LINQ to SQL will help us ensure that multiple users working with the same record don't overwrite each other's changes. The crossed methods are not supported by LINQ to Entities (the list provided by MDSN is not up to date), because they cannot be translated to proper SQL database operations. But my query does not end there. ) But one drawback of LINQ - you have to know in advance, at compile time which fields to select, what filter conditions would be. One last group of extension methods offered by LINQ to XML is related to System. Its methods and query expressions often improve the readability of programs. LINQ Companies provides employee benefits, human capital management, business, auto, home, and life insurance for all of Florida. PowerPoint Presentation 1 LinQ Introduction Outline Goals of LinQ Anatomy of a LinQ query More expression examples LinQ to Objects LinQ to XML LinQ to SQL 2 Goals of LinQ. The following example shows how to create nested groups in a LINQ query expression. Claus Konrad said The Folder class is just a simple class with 2 string properties (label and path) as the interface {IFolder] prescribes. By Tracy Mah. EDI is a hierarchical format, much like XML, but the structure isn't explicit the way it is with XML. A LINQ query, often referred to as a query expression, consists of a combination of query clauses that identify the data sources and iteration variables for the query. using System; using System. SQL GROUP BY Examples Problem: List the number of customers in each country. the group of all Red items, it seems to me that it would be better to select all the Red items first, and then filter those according to the type. *FREE* shipping on qualifying offers. now i want create hierarchy list from this list using LINQ parent--->child--->subchild Employee--->Invoice--->InvoiceDetails List Data:. Create a C# console application. Out of the box, ngRepeat doesn't have any group-by control, like ColdFusion does. Recently, I had a particular requirement in a project where I had to flatten the hierarchy of an object type with children of the same type. LINQ allows queries to be executed that include grouping. adventures in software development. LINQ’s grouping operators expose a superset of SQL’s. DocumentDB LINQ to SQL: The DocumentDB SDK supports translation of the Where() operator for filtering, Select() for projection, OrderBy() and OrderByDescending() for sorting, SelectMany() for hierarchical navigation, as well as composition and chaining of these statements. With LINQ, we can use SelectMany() to do just that. The seventeenth part of the Windows Presentation Foundation Fundamentals tutorial looks deeper into the WPF layout controls. These allow the type of all of the values that are returned from a LINQ query to be specified. By the first letter of a string property. Generic; using System. The code in this section describes the usage of a derived table and a dynamic relation in the lower-level API. LINQ is a powerful feature. It's pretty straightforward to use his techniques to write recursive LINQ statements which is great because it allows you to decompose the recursion into a series of extension methods. We can then order and group the results of our query with a few simple LINQ operators: orderby x. The detail grids are created and populated in the DataSourceNeeded event handler. Through innovative methods and efficient techniques, Language Linq can quickly improve English ability and eliminate the barrier of language from the path to. Featured Web Development Tool free downloads and reviews. One technique you can utilize with XElement is the functional construction of XML as shown in the following code sample. I have a table named dbo. The most common source of multi-level indices is grouping (the previous section has a number of. Entity Framework and LINQ to Entities supports most of the extension methods provided by Queryable class: If a Queryable method has no proper target SQL translation, this method is not supported by LINQ to Entities. The standard query operators defined by the LINQ project work over any IEnumerable-based information source, and are integrated with ADO. entities) are stored. The end result is a List>, which makes it easy for us to output as HTML:. I have got a table which goes something like this:. In SQL Server (Transact-SQL), you can create subqueries within your SQL statements. SQL SELECT Query with returning hierarchical data. To implement inheritance mapping in LINQ, you must specify the attributes and attribute properties on the root class of the inheritance hierarchy as described in the following steps. LINQ to Entities has a Group operator (literally Group By in Visual Basic and Group in C#) and a GroupBy method (with eight overloads). LINQ makes easy debugging due to its integration in the C# language. LINQ Query Syntax Tutorial Probably the most exciting new feature of LINQ is the ability to write in line SQL style queries, known as query expressions (using query syntax). SQL MAX() function with GROUP by, ORDER by: How the GROUP BY and ORDER BY clause along with the SQL MAX() can be used to find the maximum value of a column over each group. PowerPoint Presentation 1 LinQ Introduction Outline Goals of LinQ Anatomy of a LinQ query More expression examples LinQ to Objects LinQ to XML LinQ to SQL 2 Goals of LinQ. All joins are performed using an "equijoin" comparing the strict equality of the keys selected from the outer and inner iterables:. LINQ has nothing to do with returning parent objects as that is the responsibility of the LINQ provider you're using. So what you have from this is a list item for each group and contained within each a list of the children items. NET (LINQ to SQL) and System. LINQ doesn’t enforce immutability of course – you can start off with a mutable list and change its content at any time, for example, or change the properties of one of the objects referenced within it, or pass in a delegate with side-effects – but LINQ itself won’t introduce side-effects. Don't use LINQ? LINQ is slow, in general, but the fundamental solution is to reconsider the problem. use of constraint key word and select record from How to show record with Serial Number using. The group operator is used in conjunction with group-by functions. join Clause. Hierarchical data has a parent-child relationship that is not naturally represented in a relational database table. What to do if I want to obtain the item "My Object A" and all children under him, including. Ultimately it sounds like you want to invert the hierarchy which is not something you'd normally do with LINQ. Let us understand Rollup in SQL Server with examples. LinQ is published monthly by and for the Pride Community Services Organization members and community. NET LINQ C# SQL. Grouping and Joining Data - examines the standard query operators and query syntax used to group and join data. In general, the “first” sequence is given more importance than the “second” sequence in LINQ: it’s generally the one which is streamed, with the second sequence being buffered if necessary. Conclusion. In a program, we could use a List collection to represent this. Here is a simple demonstration of grouping by more than 1 column using customer table from. Restricted Read: Can view pages and documents, but cannot view historical versions or user permissions. Lots of blog posts and research papers are written about the topics of scaling up and scaling out. ) Group Join ZThe lambda expression for shaping is applied on the outer element and the set of all the inner elements that matches the outer one. Featured Model Hierarchy free downloads and reviews. This GROUP BY clause follows the WHERE clause in a SELECT statement and precedes the ORDER BY clause. Querying and Searching XML Documents Using LINQ to XML - examines querying and filtering XML documents using the LINQ to XML API. 1 RYA LINQ TP VALUATION Performance of Key Features and Interfaces in DryadLINQ CTP Hui Li, Ruan Yang, Yuduo Zhou, Judy Qiu July 31, 2011 SALSA Group, Pervasive Technology Institute, Indiana University. I cannot imagine if there is some other solution that is. 6m developers to have your questions answered on Query link table in Many to Many Relationship of Data Access, formerly OpenAccess ORM LINQ (LINQ specific questions). Note that grouping is not supported with simple data-binding (calling DataBind()). Chapter 2 examines LINQ to Objects, which means that you can use LINQ to query objects in a collection. groupBy function. Entity and System. Let us understand Rollup in SQL Server with examples. LINQ is the perfect tool to dynamically transform data at runtime, which makes it the perfect solution to add chart grouping functionality. 2 Recursive Hierarchy. What This Book Covers Chapter 1 looks at the overall features of LINQ, and gives an overview of different operators provided by LINQ to operate on objects, XML, relational databases, etc. Chamberlin and Raymond F. , Consultation Visual Studio. Notice that the key used in the grouping comes back as the Key property, and interestingly enough the collection of items is the grouping itself (the grouping implements IEnumerable so iterating over the grouping iterates over all items in it). using System; using System. Text; using Microsoft. So far, the examples presented have shown how to retrieve and manipulate values from individual rows in a table. Retrieve Salary by country along with grand total There are several ways to achieve this. LINQ is the perfect tool to dynamically transform data at runtime, which makes it the perfect solution to add chart grouping functionality. Full Disclosure: This book was given to me for my review. 방법: 쿼리 식의 Null 값 처리(C# 프로그래밍 가이드) LINQ 쿼리에서 null 값을 처리하는 방법을 보여 줍니다. ProductName group x by x. I hope, this article will be helpful to understand how to write complex queries using LINQ or lambda. First LINQ query (Lines 5-7) selects only those DataRows from the DataTable that belong to hierarchy of one level above current (using input parameter as a filter). Language Integrated Query (LINQ, pronounced "link") is a Microsoft. In this post I am going to explain a little bit about the TDD, code coverage and feature coverage. This example shows how to group data, and then generate XML based on the grouping. I was recently going through the forums and found some developers struggling with queries involving Classes with One-To-Many Relationship. The value of the Qualifier attribute can be used to reference the hierarchy in grouping with rollup. The usage of SQL GROUP BY clause is, to divide the rows in a table into smaller groups. LINQ introduces another entire syntax to the C# language. Linq namespace. Linq for LINQ to XML, and System. ) For online information and ordering of this and other Manning books, please visitwww. It’s about LINQ again, but it’s no as low-level as the one from previous post. With LINQ, we can use SelectMany() to do just that. LINQ makes easy debugging due to its integration in the C# language. Grouping behavior is supported by the group by clause in LINQ. Create a C# console application. LINQ Query Operators, Part 2 You can nest a subquery in a select clause to build an object hierarchy. NET web site that displays data from the AdventureWorks sample database. In this tip I will show you how I resolve a problem I have faced regarding joining tables where a null matched is expected when using LINQ. EDI is a hierarchical format, much like XML, but the structure isn't explicit the way it is with XML. Linq for LINQ to XML, and System. In this paper, we present a hierarchical distributed Fog Computing architecture to support the integration of massive number of infrastructure components and services in future smart cities. Here generally the query ends with group by or select. Published: 26 Oct 2010 Abstract This article demonstrates the Group Expert and Hierarchical Grouping options using Crystal reports with the help of an ASP. I cannot imagine if there is some other solution that is. LINQ wurde federführend von Erik Meijer entwickelt und erschien erstmals mit. Please have a try and note this approach is used LINQ to Objects, while for using LINQ to Entities, unfortunately, the LINQ to Entities does not support such a cast. For instance, you may have the following data: Heading [] headings = new [] { new Heading { Level = 1, Text = "Intro"},. This is a more complex example involving GROUP JOINS. I cannot imagine if there is some other solution that is same short and clear as one that LINQ provides. I have some collection of groups and inside those groups I have individual elements. You typically use a GROUP BY clause in conjunction with an aggregate expression. 0 language extensions to support it. Notice that the key used in the grouping comes back as the Key property, and interestingly enough the collection of items is the grouping itself (the grouping implements IEnumerable so iterating over the grouping iterates over all items in it). Have you ever needed a way to re-curse an object hierarchy in a very generic and simple way. Developer & Platform Group. Join a community of over 2. You can also get directly to a grouping you want by using the indexer on the lookup, like:. You can use Enumerable. Words Mail Merge data source objects such as DataSet, DataTable, and others while working with LINQ Reporting Engine as well. The end result is a List>, which makes it easy for us to output as HTML:. using System; using System. SelectToken provides a method to query LINQ to JSON using a single string path to a desired JToken. NET code, but use VB. For instance, you may have the following data: Heading [] headings = new [] { new Heading { Level = 1, Text = "Intro"},. Whenever you hear the word projection while writing LINQ or lambda queries, it is nothing but your Select statement. 6m developers to have your questions answered on Query link table in Many to Many Relationship of Data Access, formerly OpenAccess ORM LINQ (LINQ specific questions). The Language Integrated Query (LINQ) Project will offer an integrated programming experience, enabling developers to query object, relational and XML data directly from within C# and Visual Basic – without having to use multiple programming languages. We can then order and group the results of our query with a few simple LINQ operators: orderby x. Today I was writing a Linq query in which I wanted to applying grouping to query based on more than 1 column and also apply filter on the group more like having clause. LINQ enables you to query and manipul shows how. In this blog I will show how to use Kettle to run SAP extractions created with Xtract Universal to load it into an Oracle Database. In this article, I will demonstrate how to query a Hierarchical Parent-Child Structure using LINQ. When it is necessary to group by multiple keys, the selector must include an expression. Its methods and query expressions often improve the readability of programs. Each tool minimizes and simplifies the code required to manage collections. NET, and unstructured data sources. We will use the following Employees table for the examples in this video. This example shows how to group data, and then generate XML based on the grouping. This is a more complex example involving GROUP JOINS. The LINQ to ADO. What is also the data type of MyInfo. LINQ-like syntax using tagged templates. With the XAML code of the MainPage, a CollectionViewSource is instantiated. DocumentDB LINQ to SQL: The DocumentDB SDK supports translation of the Where() operator for filtering, Select() for projection, OrderBy() and OrderByDescending() for sorting, SelectMany() for hierarchical navigation, as well as composition and chaining of these statements. The second edition of this acclaimed guide provi. Build powerful LINQ queries, handle hierarchical and relational data, use lambdas and expression trees, and develop multi-threaded applications. Advanced querying using Entity Framework Code First and LINQ. @weitzhandler currently, the Include(string) is supposed to be used for dynamic include generation, just like you did in the example above. x Introduction All sample code shown in this book is available for downloading from the book Web site. Lets see an example of LINQ group by using comprehension query syntax. dbml”(LINQ to SQL) file when added in the application. Queryable classes. Enumerable class that I find I'm using more and more is the SelectMany( ) method - it wasn't obvious at all to me when I first saw it what it's purpose is. LINQ to SQL vs. Below, you'll find two examples of the usage of group by in a Linq to LLBLGen Pro query: one groups on multiple fields, the other one shows how to produce a hierarchical set where per group key (the field(s) the set was grouped on) the matching data elements (e. Tahir Hassan's Blog. 6m developers to have your questions answered on Query link table in Many to Many Relationship of Data Access, formerly OpenAccess ORM LINQ (LINQ specific questions). Professional ADO. I have to list the number of documents related to items in a hierarchical tree. You can traverse GameObject hierarchy tree easily and you can add GameObject to hierarchy structure easily. LINQ allows usage of a single LINQ syntax while querying many diverse data. XML Schema 1. Calling these crossed methods throws NotSupportedException at. Grouping is one of the most powerful capabilities of LINQ. tid? Because if you create a grouping it will return a hierarchical data object. You may need to transform this data into a hierarchy, such as an XML tree. In the code in Listing 7. Issuu company logo page 10 Learn how one group is using the Pulse nightclub tragedy to. SQL GROUP BY Examples Problem: List the number of customers in each country. Join Olivia Chiu Stone for an in-depth discussion in this video Group queries with lambda expressions, part of LINQ with C# Essential Training within a hierarchy. See How to: Configure inheritance by using the O/R Designer. You can use common Aspose. We had to write several lines of code, compile them, and then execute the resulting program, just to obtain the result of a simple sentence written on the screen. SelectMany() to aggregate all the Items collections from your ColdFood members, and the do a simpler LINQ query on that result. Out of the box, ngRepeat doesn't have any group-by control, like ColdFusion does. LINQ's hierarchical structure shines a clarifying light on the relational data in your programs. LINQ to GameObject is GameObject extensions for Unity that allows traverse hierarchy and append GameObject like LINQ to XML. We will build dynamic queries based upon which plot element the user clicks while keeping our original data source intact (raw and unorganized). Should I use. description. The value of the Qualifier attribute can be used to reference the hierarchy in grouping with rollup. In the last post I showed how AutoMapper and its LINQ projection can prevent SELECT N+1 problems and other lazy loading problems. This article explores how to use Entity Framework 6 to manage the retrieval and display of hierarchical data such as you might find in a menu system. Grouping behavior is supported by the group by clause in LINQ. Represents a JSON object. All traverse methods return IEnumerable and deferred exectuion. But, nesting ngRepeats is fairly straightforward if you take on the. LINQ is a powerful feature. now i want create hierarchy list from this list using LINQ parent--->child--->subchild Employee--->Invoice--->InvoiceDetails List Data:. In the case you run into this again and you DO control the db schema, you can take two different approaches. Hierarchical data has a parent-child relationship that is not naturally represented in a relational database table. I cannot imagine if there is some other solution that is. Language Integrated Query (LINQ), as well as the C# 3. WPF DataGrid is also used for showing group of items. I probably should have called it Documents for consistency. In this course, LINQ Fundamentals with C# 6. Retrieve Salary by country along with grand total There are several ways to achieve this. …The into keyword can also be used with the select…or group clauses to signal a query continuation. This example shows how to group data, and then generate XML based on the grouping. Using this approach you can load an unlimited number of detail levels, which can be populated from the same table (self-reference). Full Disclosure: This book was given to me for my review. On the other hand, if you are using. Entity and System. NULLs are considered equivalent for grouping purposes. LINQ Programming details cutting-edge techniques to effectively assimilate XML, SQL, ADO. groupBy function. Integrate data queries into. Handling data structures, we sometimes have to extract and flatten nested collections into a single one. I hope, this article will be helpful to understand how to write complex queries using LINQ or lambda. LINQ to XML does introduce a new class hierarchy in. Here is the problem: Use the Invoice Class provided to create an array of Invoice Objects. A few more interesting and lesser-known LINQ to SQL techniques. When using any grouping function, the word by is sufficient for representing the group operator. Can you show in a diagram what you want that grouping to look like or what you need it to look like. XAML Code - CollectionViewSource and ListView. In addition to the actual data to return, LINQ queries can also specify additional information, such as sort order, and grouping of the returned data. LINQ to SQL. ProductName group x by x. There are many collection sorting methods. Telerik RadGrid allows such data manipulation through the custom paging mechanism integrated in the control. AnalysisServices; using Microsoft. LINQ allows usage of a single LINQ syntax while querying many diverse data. LINQ doesn’t enforce immutability of course – you can start off with a mutable list and change its content at any time, for example, or change the properties of one of the objects referenced within it, or pass in a delegate with side-effects – but LINQ itself won’t introduce side-effects. In this section, we will illustrate how summary information can be obtained from groups of rows in a table. In the code in Listing 7. Net à Montréal. # re: How to Retrieve subclass objects of type from List using LINQ and Generics I am a standard visitor to your site and have continually delighted in the kind of work that you do. Notice that the key used in the grouping comes back as the Key property, and interestingly enough the collection of items is the grouping itself (the grouping implements IEnumerable so iterating over the grouping iterates over all items in it). Hi, I would like to transform a flat list into a hierarchical list. The join clause is used to define a one-to-one relationship between the elements two iterables. NET Framework 3. They are defined in the System. C# Joins and Associations in Typed and Untyped DataSets. In LINQ, grouping operators pick the elements of the sequence or collection which contains common attributes and serve them in a group. Entity Framework and LINQ to Entities supports most of the extension methods provided by Queryable class: If a Queryable method has no proper target SQL translation, this method is not supported by LINQ to Entities. This is a more complex example involving GROUP JOINS. NET languages. This property is only used for fields in the SelectFields collection. Join Operators in LINQ it yields a hierarchical result, grouped by each outer element. Summarizing Values: GROUP BY Clause and Aggregate Functions. Posts about Object-relational mapping written by lukaseder. This part discusses how to query SQL database with the defined mapping classes. The results of the grouping can use automatic naming, and in other cases can be explicitly named. The 3 query expressions use an orderby element, orderby element ascending, and orderby element descending syntax. As millions of years pass, layers of rock are added to the ground. and I think it provides better visibility on how to deal with more complex cases than a simple single level hierarchy:. XmlDocument) is the standard DOM-style API for XML. This article shows how to use LINQ to Objects and the jQuery Accordion to display the result of a database query in such a fashion within Razor Web Pages. (At least, those questions concerning regular expressions. OfType is also useful if you are working with an inheritance hierarchy and only want to select objects of a specific subtype from a collection. Part 101 - Grouping sets in SQL Server ROLLUP in SQL Server is used to do aggregate operation on multiple levels in hierarchy. If you use Linq to LLBLGen or QuerySpec (recommended) you're derived tables / dynamic relations automatically. This article explains how to convert data from a self referencing table (adjacency model) to a hierarchy of nested collections (nested set model). net MVC hierarchical data from two LINQ to SQL tables as html tiered list for use as treeview 3. LINQ Query Syntax Tutorial Probably the most exciting new feature of LINQ is the ability to write in line SQL style queries, known as query expressions (using query syntax). Telerik RadGrid allows such data manipulation through the custom paging mechanism integrated in the control. Even complex relational models become intuitive and easy to manipulate. NET WebForms, ASP. The simplest(?) way to do tree-based queries in SQL The other day I was looking around at "tree" model libraries for Django, and I noticed that there are an awful lot of algorithms people use to manage hierarchies in SQL out there, but the one that is simplest (at least in my view) seems to not be very widely known at all. entities) are stored. Grouping Operators in LINQ - The operators put data into some groups based on a common shared attribute. Queryable classes. ) Select Many ZEach object in the result set may contain a collection or array. 101 LINQ Samples Learn how to use LINQ in your applications with these code samples, covering the entire range of LINQ functionality and demonstrating LINQ with SQL, DataSets, and XML. Advanced querying using Entity Framework Code First and LINQ. I have a table that has 3 colums Id ParentId Name The table links to itself with ParentId -> Id Id like to somehow grab all the parents until ParentId == null i've quickly searched for "LIN. I cannot imagine if there is some other solution that is same short and clear as one that LINQ provides. SelectToken provides a method to query LINQ to JSON using a single string path to a desired JToken. LINQ was designed to be fast, so it came as a bit of a surprise to me when I ran a simple comparison (between a regular loop above and a LINQ query which does the same thing) – and found LINQ to be slower. LINQ doesn’t enforce immutability of course – you can start off with a mutable list and change its content at any time, for example, or change the properties of one of the objects referenced within it, or pass in a delegate with side-effects – but LINQ itself won’t introduce side-effects. You typically use a GROUP BY clause in conjunction with an aggregate expression. They also improve readability, portability, filtering, grouping, and ordering; all with minimal coding. Entity for EF's Entity SQL. The basic syntax of a GROUP BY clause is shown in the following code block. Here is simple. Its methods and query expressions often improve the readability of programs. LINQ allows usage of a single LINQ syntax while querying many diverse data. Or better yet we all wanted to have Grid in Grid or hierarchical grids showing one Customer in a row and her Orders in a grid in another grid cell. You can also get directly to a grouping you want by using the indexer on the lookup, like:. I love LINQ to interact with SQL in C#, but When it comes to arrays or lists, It's very rare it is more readable or more maintainable than a classic for loop. Find 34098+ best results for "linq to sql hierarchical data" web-references, pdf, doc, ppt, xls, rtf and txt files. description. I expected that would be easy with LINQ, but quickly realized that there is no method in the. I want to write LINQ query to get all questions where the question Title begins with numbers. As millions of years pass, layers of rock are added to the ground. Net à Montréal. the group of all Red items, it seems to me that it would be better to select all the Red items first, and then filter those according to the type. Model Hierarchy Software Informer. Key; As you can see, LINQ supports the "group by" clause to. You can apply this concept to other list-bound controls. The need to combine results in multiple SQL Server tables for producing a list of records or summary reports are often a challenge to us as a developer. Language Integrated Query (LINQ), as well as the C# 3. We specify how an element is transformed into a collection of other elements. Chapter 2 examines LINQ to Objects, which means that you can use LINQ to query objects in a collection. I really enjoyed reading Wes Dyers blog post on the Y-combinator. Class Invoice includes four properties- a PartNumber (type integer), a PartDescription (type String), a Quantity of the item being purchased (type Integer), and a Price (type Decimal). Approve: Can edit and approve pages, list items, and documents. NET LINQ C# SQL. Group Join Clause Describes the Group By clause, which groups the elements of a query result and can be used to apply aggregate functions to each group. Efficient querying with LINQ, AutoMapper and Future queries 11 March, 2014. LINQ was supposed to outperform the loop. XAML Code - CollectionViewSource and ListView. i have the below data , employee column consider as parent and each employee have invoice as child and each invoice have invoicedetails as subchild. By default, this displays the name of the group, for example, ShipCountry, followed by the current group and the number of items in the group. NET web site that displays data from the AdventureWorks sample database. To implement inheritance mapping in LINQ, you must specify the attributes and attribute properties on the root class of the inheritance hierarchy as described in the following steps. The Grid allows developers to add detail grids on the fly to create a treeview-like hierarchy. jqSuite a set of user inteface UI components for Javascript, ASP.