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Normally, Access displays the rows in your recordset in the order in which they re retrieved from the database. You can add sorting information to determine the sequence of the data in a query. Click in the Sort row for the field you want to sort on, and select Ascending or Descending from the drop-down list. In the example shown in Figure 7-24, the query results are to be sorted in descending order based on the calculated NewTotalCharge field. (Note that I have given the calculated field a field name.) The recordset will list the most expensive reservations first. The resulting Datasheet view is shown in Figure 7-25 on the next page. You can find this query saved as qryXmplChargeCalcSorted in the HousingDataCopy.mdb sample database.

public void UpdateSubject(Subject cachedSubject) { LinqBooksDataContext context = new LinqBooksDataContext(); context.Subjects.Attach(cachedSubject); cachedSubject.Name = @"Testing update"; context.SubmitChanges(); }

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In this example, we begin with the existing, unchanged object. This object could have been cached in an ASP.NET Session object or supplied as a parameter of our method. We connect the object to the DataContext using the Attach method B. Once it is attached, the context s change- and identity-tracking service can monitor the changes we re going to apply. Any subsequent changes C will be tracked by the change-tracking service and updated accordingly. Remember that the object must be attached prior to making the changes or else the change tracking will not be aware of the changes. If you try to attach a value already updated, as is typical in a web service scenario, you can t just attach this already-changed version unless the object has some special characteristics. If you implement a TimeStamp column in your object, as we did with the Author object, you can attach the author object using the overloaded Attach method as follows:

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The boot video driver is called, which in turn displays the Windows startup screen, which by default consists of a black screen and a progress bar If the quietboot boot option was used, this step will not occur..

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context.Authors.Attach(cachedAuthor, True)

Why specifying sort criteria is important When Microsoft Access solves a query, it tries to do it in the most efficient way. When you first construct and run a query, Access might return the rows in the sequence you expect (for example, in primary key sequence of the table). However, if you want to be sure Access always returns rows in this order, you must specify sort criteria. As you later add and remove rows in your database, Access might decide that fetching rows in a different sequence might be faster, which, in the absence of sorting criteria, might result in a different row sequence than you intended.

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You can also sort on multiple fields. Access honors your sorting criteria from left to right in the design grid. If, for example, you want to sort by FacilityID ascending and then by NewTotalCharge descending, you should include the FacilityID field to the left of the NewTotalCharge field. If the additional field you want to sort is already in the design grid but in the wrong location, click the column selector box (the tinted box above the field row) to select the entire column and then click the selector box again and drag the field to its new location. If you want the field that is out of position to still appear where you originally placed it, add the field to the design grid again in the correct sorting sequence, clear the Show check box (you don t want two copies of the field displayed), and set the Sort specification. Figure 7-26 shows the query shown in Figure 7-24 modified to sort first by FacilityID and then by NewTotalCharge, but leaves FacilityID displayed after ReservationID. I saved this query in the HousingDataCopy.mdb sample database as qxmplChargeCalcSortedTwo.

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LINQ releases through the beta cycle used the Add and Remove methods on the table objects. When Visual Studio 2008 was finished, the names for these methods were changed to InsertOnSubmit and RemoveOnSubmit. Earlier documentation may still refer to the earlier API.

Figure 24-20. The message box that appears if the Switchboard Manager does not find a valid Switchboard form and Switchboard Items table in your database.

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