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Windows NT 4 networking APIs (Net APIs) are used by Windows NT 4 clients to gain access to Active Directory through SAM. NTDS API is used to look up SIDs and GUIDs in an Active Directory implementation (via DsCrackNames mostly) as well as for its main purposes, Active Directory management and replication. Several third parties have written applications that monitor Active Directory from these APIs. Active Directory is implemented as a database file that by default is named \%SystemRoot%\Ntds\Ntds.dit, and that is replicated across the domain controllers in a domain. The Active Directory directory service, which is a Windows service that executes in the Local Security Authority Subsystem (Lsass) process, manages the database, using DLLs that implement the on-disk structure of the database as well as provide transaction-based updates to protect the integrity of the database. The Active Directory database store is based on a version of the Extensible Storage Engine (ESE), also known as JET Blue, database used by Microsoft Exchange Server 2007, Desktop Search, and Windows Mail. The ESE library (%SystemRoot%\System32 \Esent.dll) provides routines for accessing the database, which are open for other applications to use as well. Figure 12-33 shows the Active Directory architecture.

This is why most of the calendar buttons use my custom form (frmCalendar) instead of the form that depends on the ActiveX control I recommend that you try the ActiveX control first If you find that your application has problems on some machines on which you attempt to install your application, you might need to get creative and build your own solution using native Access tools..

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The LINQ expression is more explicit than the corresponding SQL statement due to the fact that LINQ is designed to work not only with relational data, but other data sources as well, including objects and hierarchical sources. Since we ve accomplished our goal, we could easily stop here, but LINQ to SQL offers more functionality that we need to look into before moving on. Although there are times where forcing a relational construct into an objectoriented model is necessary, working with object hierarchies directly can often be more appropriate for application development.

Although you can certainly store and display photos in an Access application using the OLE Object data type, if your application might need to interact with a Web application, you cannot use this feature. Web applications, including data access pages, cannot handle the internal format of a stored OLE Object data type. Also, if your application needs to handle 872

Automating Your Application with Visual Basic hundreds or thousands of photos, you could easily exceed the two gigabyte file size limit for an mdb file. The alternative method is to store the pictures as files and save the picture path as a text field in your tables. However, you ll need to write code in your desktop or project application to display the pictures. The Housing Reservations database (Housing.mdb) is designed to work on the Web. Open the Housing.mdb sample database and then open the frmEmployees form, as shown in Figure 23-6. The employee picture you see is fetched from the path stored in the Photo field of the table.

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At the heart of the object/relational impedance mismatch is the clash between rows of data joined by identifying columns (relational) and memory constructs containing collections of objects (object-oriented). These objects can contain additional collections of objects. Thus where our database contains rows of books and subjects that we can join, it doesn t have an easy way to read a subject and then automatically show us the books associated with that subject. We need to explicitly tell the database to join the two tables to return the results. In an object-oriented world, we typically obtain an instance of an object, like the Subject. From the Subject, we can drill in to identify the Books that belong to that Subject. We could potentially also drill in through the book to see the Authors, or any other property that we choose to expose. Luckily, LINQ to SQL offers an easy way to navigate these object hierarchies. If we return to the definition of the Subject class, we may determine that we d like a method that allows us to drill into the books that belong to that subject. Typically, we d do that by lazy loading the books related to each subject as we called for them (see section 6.5.1 for more on lazy loading). Books would then be a property of a Subject object that we could drill into and work with as we wished. The mapping functionality in LINQ to SQL used in listing 6.20 shows how we can expose our collection of Book objects as a generic System.Data.Linq.EntitySet<Book> object and call it Books. Again, we will use the auto-implemented property syntax for brevity.

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