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The DSADD command, introduced in 2, is used to add objects to Active Direc tory. To add a group, use the syntax dsadd group GroupDN The GroupDN parameter is one or more distinguished names for the new user objects. If a DN includes a space, surround the entire DN with quotation marks. The GroupDN parameter can be entered one of the following ways:

Figure 1-13

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As you can see, when you query the UDT without calling a property, you see the raw byte form of the type. For the value 0xC375050000000000000000000000020003555344, the first 16 bytes shown in bold type represent the decimal value. It is placed before the string simply because we wrote it out before the string in the Write method. Of course, it is very important to read the data in the same order that you write it in the Read method; otherwise, you will end up with some really nasty bugs. If you were to use the native format instead, you wouldn t need to worry about this. However, because the native format is very limited as to which data types can be used, you typically will need to use the user-defined format. The last 4 bytes of the type are the string that represents the currency code 03555344 (03 = three characters in the string, followed by the hexadecimal representation of each character: 55H/85D = U, 53H/83D = S, and 44H/68D = D). As with UDFs, the result of a UDT s method can be persisted and indexed (in this case, it must be persisted to be indexed) using a computed column. Consider the following T-SQL example, where we create a persisted computed column to index the currency code of the price in the Production.TestProducts table and then query the column for the number of prices that are noted in Swedish kronor (SEK):

You are an application developer for Contoso, Inc. For the last two years, you have been developing and maintaining an internal customer relationship management system. Recently, the Contoso Sales group has asked for a way to send confirmation e-mails to customers before making changes to their account information. Your manager asks you to interview key people and then come to her office to answer her questions about your design choices.

1. What are two benefits of storing XML in a text column in SQL Server 2005 2. What are two disadvantages of storing XML in a text column in SQL Server 2005

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Fortunately, WCF detects this situation and raises an InvalidOperationException. However, suppose the situation is not only acceptable but required In this case, you must mark the service object as having a ConcurrencyMode of Reentrant. As has been mentioned, a Reentrant service operates in the same manner as a Single service. The difference is that when the service object executes a callback method or makes a call to another service, the lock is released. This allows other requests to be processed. When the response from the callback or other service is received, it is queued (along with other requests) so that it can reacquire the lock and complete its work. Reentrancy does pose a potential problem regarding the state of the service object. Because sending a request to the callback method or downstream call releases the lock on the service object, other requests can be processed. Those requests can modify the state that is maintained within the service object. Now when the callback method or downstream call has finished processing, the state is not the same as when the request to the callback method or downstream call was made. This can be alleviated by placing a manual lock on the service resource. However, even with manual synchronization, you must ensure that a deadlock situation doesn t occur. For example, if the original request locks the state resource and then sends a request to the callback method or downstream call without unlocking, the next request would grab a lock on the service object but be unable to get the lock for the state resource.

"VB Public Sub DeleteCustomer(ByVal customerId As Integer) Try " Create ServiceConfig and set properties to define the behavior " of the services. Dim svc As New ServiceConfig() svc.Transaction = TransactionOption.RequiresNew svc.TransactionTimeout = 30 svc.TransactionDescription = "Service without Component" svc.TrackingAppName = "AdventureWorks advanced" svc.TrackingComponentName = "12" svc.TrackingEnabled = True ServiceDomain.Enter(svc) " Use data access layer for database interaction

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