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network resources such as files, printers, and network services as if the client were physically connected to the remote access server s network. Windows provides two types of remote access: Dial-up remote access is used by clients that connect to a remote access server via a telephone or other telecommunications infrastructure. The telecommunications medium is used to create a temporary physical or virtual connection between the client and the server. Virtual private network (VPN) remote access lets a VPN client establish a virtual pointto-point connection to the server over an IP network such as the Internet. Windows also supports the Secure Socket Transmission Protocol (SSTP), which is a newer tunneling protocol for VPN connections that has the ability to pass through most firewalls and routers that block PPTP or L2TP/IPSec traffic. It does so by packaging PPP data over the SSL channel of the HTTPS protocol. Because the latter operates on port 443 and is usually part of typical Web browsing behavior, it is much more likely to be available than traditional VPN tunneling protocols. Remote access differs from remote control solutions because remote access acts as a proxy connection to a Windows network, whereas remote control software executes applications on a server, presenting a user interface to the client.

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Finding the rows that differ in this way has the added benefit of displaying the calculated difference. If you re only interested in finding the rows that differ but don t care about the amount of the difference, you don t need the second expression at all. You can find the rows you want by placing the expression <>[TotalCharge] in the Criteria line under the first expression you entered. This asks Access to compare the amount calculated at the straight daily rate with the value in the TotalCharge field stored in the record and display the row only when the two values are not equal.

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To accomplish the same thing with LINQ, we need to observe that we re looking for books where the subject exists or is null. The DefaultIfEmpty() extension method comes to our rescue, as shown in listing 6.18.

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var query = from subject in Subjects join book in books on subject.SubjectId equals book.SubjectId into joinedBooks from joinedBook in joinedBooks.DefaultIfEmpty() select new { subject.Name, joinedBook.Title, joinedBook.Price };

Adding parentheses to expressions for clarity You might have noticed that I placed an extra set of parentheses around the original expression we built to calculate the amount at the daily rate before subtracting that amount from the stored value. If you study Table 7-4 carefully, you ll see that I really didn t have to do this because Access would perform the multiplication before doing the final subtract. However, I find it s a good practice to add parentheses to make the sequence of operations crystal clear I don t always remember the order of precedence rules, and I don t want to have to go looking up the information in Help every time I build an expression. Adding the parentheses makes sure I get the results I want.

So far, you have built fairly simple expressions. When you want to create a more complex expression, sometimes the Expression Builder can be useful, as discussed in the next section.

For more complex expressions, Access provides a utility called the Expression Builder. Let s say you want to double-check the total amount owed for a reservation in the sample database. You have to work with several fields to do this CheckInDate, CheckOutDate, DailyRate, and WeeklyRate. You need to calculate the number of weeks to charge at the WeeklyRate and then charge the remaining days at the DailyRate. To see how the Expression Builder works, start a new query on the tblReservations table. Click in an empty field in the design grid, and then click the Build button on the toolbar. Access opens the Expression Builder window shown in Figure 7-20.

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In this case, we tell LINQ that we want to join the books and subjects and place the results in a new temporary object called joinedBooks. Then we want to view the results from the Subjects and the joined Books, using the DefaultIfEmpty extension method to return a default value if the subject doesn t contain a book.

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Now that we can combine our books and subjects, let s return to the original query we started at the beginning of the chapter to see how far we ve come. Listing 6.19 shows the end result.

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