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To succeed in using objects and relational databases together, you need to understand both paradigms, along with their differences, and then make intelligent tradeoffs based on that knowledge. The main goal of LINQ and LINQ to SQL is to get rid of, or at least reduce, the need to worry about these limits. An impedance mismatch forces you to choose one side or the other as the primary side. With LINQ, Microsoft chose the programming language side, because it s easier to adapt the C# and VB.NET languages than to change SQL or XML. With LINQ, the aim is toward deeply integrating the capabilities of data query and manipulation languages into programming languages. LINQ removes many of the barriers among objects, databases, and XML. It enables us to work with each of these paradigms using the same language-integrated facilities. For example, we are able to work with XML data and data coming from a relational database within the same query.

Notice that you use an index number to fetch the column you want and that the index starts at zero. You can reference the fifth column in the query (UnitPrice) by asking for the Column(4) property of the combo box. Notice also that the code uses the Me shortcut object to reference the form object where this code is running. So, every time you pick a different product, the AfterUpdate event occurs for the ProductID combo box, and this code fills in the related price automatically. If you open the frmContacts form in Design view, select the fsubContactProducts form on the Products tab, and examine the Link Child and Link Master properties, you ll find that the two forms are linked on ContactID. However, the tblContactProducts table also needs a CompanyID field in its primary key. Code in the module for the fsubContactProducts form handles fetching the default CompanyID for the current contact, so you don t need an intermediary subform that would clutter the form design. If you still have the module for the fsubContactProducts form open in the VBE window, you can find the code in the Form_BeforeInsert procedure. The code is as follows:

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Private Sub Form_BeforeInsert(Cancel As Integer) Dim varCompanyID As Variant First, disallow insert if nothing in outer form If IsNothing(Me.Parent.ContactID) Then MsgBox "You must define the contact information on a new row before "attempting to sell a product", vbCritical, gstrAppTitle Cancel = True Exit Sub End If Try to lookup this contact s Company ID varCompanyID = DLookup("CompanyID", "qryContactDefaultCompany", _ "(ContactID = " & Me.Parent.ContactID.Value & ")") If IsNothing(varCompanyID) Then If not found, then disallow product sale MsgBox "You cannot sell a product to a Contact that does not have a "related Company that is marked as the default for this Contact." " Press Esc to clear your edits and click on the Companies tab " "to define the default Company for this Contact.", vbCritical, _ gstrAppTitle Cancel = True Else Assign the company ID behind the scenes Me.CompanyID = varCompanyID End If End Sub

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Because code is worth a thousand words, let s take a look at a quick code sample using the power of LINQ to retrieve data from a database and create an XML document in a single query. Listing 1.5 creates an RSS feed based on relational data.

Although the Transactdemo tool presents you with the option to roll back or commit the current transaction, the Fsutil utility allows commits or rollbacks to any ongoing transaction your account has access to. Go back to the command prompt where you ran Transactdemo and press C to commit the transaction, after which the file becomes a standard nontransacted file. Transactional APIs TxF implements transacted versions of the Windows file I/O APIs, which use the suffix Transacted: Create APIs CreateDirectoryTransacted, CreateFileTransacted, CreateHardLinkTransacted, CreateSymbolicLinkTransacted Find APIs FindFirstStreamTransacted FindFirstFileNameTransacted, FindFirstFileTransacted,

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var database = new RssDB("server=.; initial catalog=RssDB"); XElement rss = new XElement("rss", new XAttribute("version", "2.0"), new XElement("channel", new XElement("title", "LINQ in Action RSS Feed"), new XElement("link", "http://LinqInAction.net"), new XElement("description", "The RSS feed for this book"), from post in database.Posts orderby post.CreationDate descending Creating select new XElement("item", XML new XElement("title", post.Title), new XElement("link", "posts.aspx id="+post.ID), new XElement("description", post.Description), from category in post.Categories select new XElement("category", category.Description) ) ) );

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