c# .net core barcode generator

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The DefaultIfEmpty operator supplies a default element for an empty sequence. DefaultIfEmpty uses the default keyword of generics. It returns null for reference types and zero for numeric value types. For structs, it returns each member of the struct initialized to zero or null depending on whether they are value or reference types. In our case, the default value is null, but we can test against default(Book) to decide what to display for books. We ve just seen group joins, inner joins, and left outer joins. There is one more kind of join operation we d like to introduce: cross joins. Cross join A cross join computes the Cartesian product of all the elements from two sequences. The result isasequencethatcontainsacombinationofeach element from the first sequence with each element from the second sequence. As a consequence, the number of elements in the result sequence is the product of the number of elements in each sequence. Before showing you how to perform a cross join, we d like to point out that in LINQ, it is not done with the Join operator. In LINQ terms, a cross join is a projection. It can be achieved using the SelectMany operator or by chaining from clauses in a query expression, both of which we introduced in section 4.4.2.

operations master A domain controller that has been assigned one or more special roles in an Active Directory domain. The domain controllers assigned these roles perform operations that are single-master (not permitted to occur at different places on the network at the same time). selective authentication A method of setting the scope of authentication differently for outgoing and incoming external and forest trusts. Selective trusts allow you to make flexible access control decisions between external domains in a forest. trust relationship A logical relationship established between domains to allow pass-through authentication, in which a trusting domain honors the logon authen tications of a trusted domain. User accounts and global groups defined in a trusted domain can be given rights and permissions in a trusting domain, even though the user accounts or groups don t exist in the trusting domain s directory.

Windows Media Player does not connect to Media Guide or to the Windows Media online artist information database. If you find you never connect to WindowsMedia.com and that Windows Media Player is consistently unable to download track information for your CDs, even when you know you have a functioning Internet connection, you might have inadvertently set the program to stay offline. To see if this is the case, open the File menu. If Work Offline is checked, choose this command to clear the check mark and go back online.

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As an example, let s say we want to display all the publishers and the books projected together, regardless of whether there is a link between them. We can add a column to indicate the correct association, as in figure 4.22. Listing 4.27 shows the query expression that yields this result.

Microsoft Windows XP Inside Out, Second Edition Windows Media Player 10 offers an extensive array of customization and configuration options. Some of these options simply change the Player s look and feel, but others have a major impact on the quality of your experience. For instance, the file format you choose to use when recording CD audio tracks affects both the quality of the recorded files and the amount of space they take up. In this chapter, we look at how Windows Media Player works and how you can fine-tune it for your own preferences. In 20, we examine the program s most popular use: creating and managing a digital music collection.

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A tree root domain is the highest-level domain in the tree; child and grandchild domains are arranged under it. Typically, the domain you select for a tree root should be the one that is most critical to the operation of the tree. A tree root domain can also be the forest root domain.