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As an alternative to the Cast operator, you can also use the OfType operator. The difference is that OfType only returns objects from a source collection that are of a certain type. For example, if you have an ArrayList that contains Book and Publisher objects, calling theArrayList.OfType<Book>() returns only the instances of Book from the ArrayList. As time goes by, you re likely to encounter nongeneric collections less and less because generic collections offer type checking and improved performance. But until then, if you want to apply your LINQ expertise to all collections including nongeneric ones, the Cast and OfType operators and explicitly typed from iteration variables are your friends! Querying nongeneric collections was the first common scenario we wanted to show you. We ll now introduce a completely different scenario that consists of grouping query results by composite keys. Although grouping by multiple criteria seems like a pretty simple task, the lack of a dedicated syntax for this in query expressions does not make how to do it obvious.

The Player s playback controls, shown in Figure 19-11, look and function like those on common consumer devices, such as CD players and video cassette recorders.

Hisecdc.inf In order to apply Hisecdc.inf to a domain controller, all of the domain controllers in all trusted or trusting domains must run Windows 2000 or later. If a domain controller is configured with Hisecdc.inf, the following constraints apply:

A user with an account in that domain cannot connect to any member server from a client unless both the client and the target server are running Windows 2000 or later and can use Kerberos-based authentication and the client is configured to send NTLM version 2 responses. Lightweight Directory Access Protocol (LDAP) clients cannot bind with the Active Directory LDAP server unless data signing is negotiated. Bind requests using ldap_simple_bind or ldap_simple_bind_s are rejected. By default, all Microsoft LDAP clients that ship with Windows XP request data signing if Transport Layer Security/Secure Sockets Layer (TLS/SSL) is not already being used. If TLS/SSL is being used, then data signing is considered to be negotiated.

19

System Root Security Template (Rootsec.inf)

Figure 19-11.

When we introduced grouping in chapter 4, we grouped results by a single property, as in the following query:

The system root security template specifies the new root permissions introduced with Windows XP. By default, Rootsec.inf defines these permissions for the root of the sys tem drive. This template can be used to reapply the root directory permissions if they are inadvertently changed, or the template can be modified to apply the same root permissions to other volumes. The template does not overwrite explicit permissions defined on child objects; it propagates only the permissions inherited by child objects.

The Play button becomes a Pause button while the Player is playing. The Mute button is a toggle; click one time for silence, a second time for sound. The Next and Previous buttons move ahead and back one item within the current playlist. You can drag the slider in the Seek control to move to a different place within the item that s currently playing. For example, to start the current track over again, you would drag the Seek slider all the way to the left.

Secure Templates (Securedc.inf and Securews.inf)

Windows Media Player skips when you play a CD. If you get skippy performance, try switching your CD drive to analog playback. Choose Tools, Options, and then click the Devices tab. Select your CD drive and click Properties. In the Playback section of the Properties dialog box, select Analog. If this doesn t solve the problem, select Digital again, and then try selecting Use Error Correction (in the same dialog box).

The secure templates define enhanced security settings that are least likely to impact application compatibility, such as password, lockout, and audit settings. Additionally, the secure templates limit the use of LAN Manager and NTLM authentication protocols by configuring clients to send only NTLM version 2 responses and configuring servers to refuse LAN Manager responses. Clients that run LAN Manager include Windows for Workgroups as well as Windows 95 and Windows 98 platforms that do not have the DS Client Pack installed. If the DS Client Pack is installed on Windows 95 or Windows 98, those clients can use NTLM version 2. Windows Me and Windows XP Professional support NTLM version 2 without additional modification. Securews.inf apply: