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Sometimes, the lifetime of a resource isn t simple in the sense that it doesn t follow a stack discipline. In these cases, you should almost always adopt one of two techniques: Design objects that can own one or more resources and that are responsible for cleaning them up. Make sure these objects implement System.IDisposable. Use control constructs that help you capture the kind of computation you re performing. For example, when generating sequences of data (such as from a database connection), you should strongly consider using sequence expressions, discussed in 3. These may have internal use bindings, and the resources are disposed when each sequence iteration finishes. Likewise, when using asynchronous I/O, it may be helpful to write your computation as an asynchronous workflow. 13 and the following sections provide examples.

8. 9.

You should consider implementing the IDisposable interface on objects and types in the following situations: When you build an object that uses one or more IDisposable objects internally. When you re writing a wrapper for an operating system resource or some resource allocated and managed in a native (C or C++) DLL. In this case, you should also implement a finalizer by overriding the Object.Finalize method.

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You don t need to log into YouTube or have an account in order to view YouTube videos. You do need to be logged into an account to rate videos or view your subscriptions. From the YouTube app, press the Menu button, and then My account. You ll be given a choice to use any valid YouTube account registered with your phone. If you still have a YouTube account that isn t linked to an e-mail address, you can use it as well by clicking Add an account.

10. Install the CommuniGate Pro CLI Perl Module, CLI.pm. NOTE: As the number of mail threats on the Internet has grown, the variety of methods used to fight spam has also grown. One popular way to fight spam and viruses is to deploy a hardware device on the network that intercepts traffic as it enters the network, scanning for mail threats. Examples of these devices include products from Barracuda, SonicWall, and Cisco.

When you implement the System.Collections.Generic.IEnumerable<'T> (that is, sequence) interface on a collection. The IEnumerable interface isn t IDisposable, but it must generate System.Collection.Generic.IEnumerator<'T> values, and this interface inherits from IDisposable. For nearly all collection types, the disposal action returns without doing anything.

In addition to using hardware and software on your network to scan mail for viruses and spam, you can also outsource spam and virus filtration. In fact, it is recommended for all in-house mail servers as most of these services provide some kind of perimeter failover should your mail server go down. The basic idea is that the outsourced mail filtering solution directs your MX record to the vendor s web site, and they then filter the mail for you. This reduces the bandwidth overhead coming into your network if you run your own mail server and it also helps with staffing overhead dedicated to fighting spam. Outsourced filtration companies, such as Microsoft Exchange Hosted Solutions (EHS) and MX Logic, have gained wide adoption mainly because they require little maintenance, are inexpensive, and are fairly simple to implement.

Listing 8-6 shows an example that implements an object that reads lines from a pair of text files, choosing the file at random. You must implement the type IDisposable because the object owns two internal System.IO.StreamReader objects, which are IDisposable. Note that you explicitly check to see whether the object has already been disposed. Listing 8-6. Implementing IDisposable to Clean Up Internal Objects open System open System.IO type LineChooser(fileName1, fileName2) = let file1 = File.OpenText(fileName1) let file2 = File.OpenText(fileName2) let rnd = new System.Random() let mutable disposed = false let cleanup() = if not disposed then disposed <- true; file1.Dispose(); file2.Dispose(); interface System.IDisposable with member x.Dispose() = cleanup() member obj.CloseAll() = cleanup() member obj.GetLine() = if not file1.EndOfStream && (file2.EndOfStream || rnd.Next() % 2 = 0) then file1.ReadLine() elif not file2.EndOfStream then file2.ReadLine() else raise (new EndOfStreamException()) You can now instantiate, use, and dispose of this object as follows:

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