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vbali (1) [Avatar] Offline

Can anyone help me with creating class definition for BookAuthor class used in chapter 7 page 244?

I keep on getting following error message: "Invalid association mapping for member 'Author.BookAuthors'. 'BookAuthor' is not an entity."

Here is my code for BookAuthor and Author class

class BookAuthor
public Guid Author { get; set; }

public Guid Book { get; set; }

public int? AuthorOrder { get; set; }

class Author
[Column(Storage = "iD", Name = "ID", DbType = "UniqueIdentifier NOT NULL", IsPrimaryKey = true, CanBeNull = false)]
private Guid iD;

public Guid ID
get { return iD; }
set { iD = value; }

[Column(Name="FirstName", DbType="varchar(30) not null", CanBeNull=false, UpdateCheck=UpdateCheck.Never)]
public string FirstName { get; set; }

[Column(Name="LastName", DbType="varchar(30) not null", CanBeNull = false, UpdateCheck=UpdateCheck.Never)]
public string LastName { get; set; }

[Column(Name="WebSite", DbType="varchar(200)", UpdateCheck=UpdateCheck.Never)]
public string WebSite { get; set; }

[Column(Name = "IsUpdated", DbType = "RowVersion not null", IsDbGenerated = true, IsVersion = true, CanBeNull = false,
UpdateCheck = UpdateCheck.Always)]
public byte[] RowVersion { get; set; }

private EntitySet<BookAuthor> _BookAuthors = null;

[Association(Name = "FK_BookAuthor_Author", Storage = "_BookAuthors", OtherKey = "Author", ThisKey = "ID")]
public EntitySet<BookAuthor> BookAuthors
return this._BookAuthors;