Question

Two methods:

var books = _myIBookRepository.RetrieveAllBooks();  
var bokexamples = _myIbokexamples Repository.RetrieveAllBookExample();

Two database table:

BookExample

• BokExampleID (primary key)
• BookID (Foreign key)
• OrderDetailID (Foreign key)

Book

• BookID (primary key)
• KategoryID (Foreign key)
• LanguageID (Foreign key)
• Title

BookID is a foreign key in table BookExample from table Book

If orderdetailID is NULL it means that this specfik bookexample is available in the store

Goal:
Display two column that is “Title” and “stock availiable”. “stock availiable” is a customized column that don’t exist in the database. “stock available” should contain numbers for instance 2 books of title …. is available.

Problem:
Having problem to find right source code in Linq in order to display these two column.

// Fullmetalboy

Answer 1

var query = from b in books
            select new
            {
                Title = b.Title,
                StockAvailable = bookexamples.Count(be => 
                        be.BookID == b.BookID && 
                        be.OrderDetailID == null
                    )
            };

If I understand your question right, this should be what you’re looking for.