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CHAPTER 6 s CREATING YOUR OWN TEMPLATES
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that I think I might want to reuse, I add it to ProfilerLib, so make sure you check out the project files to see what other time-saving routines are already written for you. As you'd expect by now from my code, there's a sample program, DoNothing, in the Tests directory under the ProfilerLib directory. It's the simplest profiler you can make and shows you exactly how to use ProfilerLib. It does process all notifications, but it simply beeps when initializing and unloading. That's my patented "Debug-by-Ear" method of development. Additionally, all the other utilities I wrote that utilize the Profiling API use ProfilerLib as their base classes, so you can see more advanced usage. ProfilerLib has saved me a ton of time, and I hope it will save you a great deal of time as well. ExceptionMon Once I had ProfilerLib up and running, I was able to start ExceptionMon. Looking at the ICorProfilerCallback interface, you'll see that you have all sorts of amazing callbacks to let you know exactly what processing is happening when an exception occurs. It's almost like someone at Microsoft was reading my mind! At an initial glance, you might think that ExceptionMon was absolutely trivial to implement. As usual, reality was a little bit different. In my design for ExceptionMon, I wanted to record which exception was thrown, which finally handlers were called, and where the exception was handled. The exception handling notification methods in the ICorProfilerCallback interface, listed in the following code, fit the bill exactly. The fact that you also get the function IDs as well as the object ID of the exception thrown and caught is icing on the cake. STDMETHOD ( ExceptionThrown ) ( ObjectID thrownObjectId ) ; STDMETHOD functionId ) ; ( ExceptionUnwindFinallyEnter ) ( FunctionID
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Overview
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How the CLR Controls the Layout of a Type s Fields
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n Note The compressed data returned by zlib is full 8-bit data, so might not be suitable to use in e-mails or
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Choosing ISPs
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22.3 Bag of Testing Tricks
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Sharing a folder is an easy process in Windows SBS because, as usual, there s a wizard to guide you. Start by opening the Windows SBS Console and then clicking Shared Folders And Web Sites. In the Tasks pane, click Add A New Shared Folder and follow these steps:
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TABLE 12-3
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The XmlDataSource control is a special type of data source control that supports both tabular and hierarchical views of data. The tabular view of XML data is just a list of nodes at a given level of hierarchy, whereas the hierarchical view shows the complete hierarchy. An XML node is an instance of the XmlNode class; the complete hierarchy is an instance of the XmlDocument class. The XML data source supports both read-only and read-write scenarios. The XmlDataSource control can accept XML input data as a relative or absolute filename assigned to the DataFile property or as a string containing the XML content assigned to the Data property. If schema information is not included in the source files, it can be passed in as a separate SchemaFile or Schema string. (This model is nearly identical to that of DataSetDataSource.) Once the input data for the XML data source is supplied, the control exposes that data through the IDataSource or the IHierarchicalDataSource interface. In general, the XmlDataSource control is commonly bound to a hierarchical control, such as the TreeView. To understand how the XML data source works, consider the following small XML file, named data.xml:
The optimizer typically uses the unordered nonclustered index scan + lookups access method when the following conditions are in place: The query is selective enough The optimal index for a query does not cover it The index doesn't maintain the sought keys in order For example, such is the case when you filter a column that is not the first key column in the index. The access method will involve an unordered full scan of the leaf level of the index, followed by a series of lookups. As I mentioned, the query must be selective enough to justify this access method; otherwise, with too many lookups it will be more expensive than simply scanning the whole table. To figure out the selectivity of the query, SQL Server will need statistics on the filtered column (a histogram with the distribution of values). If such statistics do not exist, SQL Server will create them. For example, the following query will use such an access method against the index idx_nc_sid_od_cid , created on the key columns (shipperid, orderdate, custid ), where custid is not the first key column in the list: SELECT orderid, custid, empid, shipperid, orderdate FROM dbo.Orders WHERE custid = 'C0000000001';
28. Managing Construction
Appendices
These methods of disambiguating a type are useful, but in some scenarios, you need to go further . Imagine that the Australian Boomerang Company (ABC) and the Alaskan Boat Corporation (ABC) are each creating a type, called BuyProduct, which they intend to ship in their respective assemblies . It s likely that both companies would create a namespace called ABC that contains a type called BuyProduct . Anyone who tries to develop an application that needs to buy both boomerangs and boats would be in for some trouble unless the programming language provides a way to programmatically distinguish between the assemblies, not just between the namespaces . Fortunately, the C# compiler offers a feature called extern aliases that gives you a way to work around this rarely occurring problem . Extern aliases also give you a way to access a single type from two (or more) different versions of the same assembly . For more information about extern aliases, see the C# Language Specification . In your library, when you re designing types that you expect third parties to use, you should define these types in a namespace so that compilers can easily disambiguate them . In fact, to reduce the likelihood of conflict, you should use your full company name (not an acronym or abbreviation) to be your top-level namespace name . Referring to the Microsoft .NET Framework SDK documentation, you can see that Microsoft uses a namespace of Microsoft for Microsoft-specific types . (See the Microsoft.CSharp, Microsoft.VisualBasic, and Microsoft.Win32 namespaces as examples .) Creating a namespace is simply a matter of writing a namespace declaration into your code as follows (in C#):
The catalog zone can contain two types of catalog parts: a PageCatalogPart control and a DeclarativeCatalogPart control. As mentioned, the former is a sort of placeholder for the Web parts that the user removes from the page. The DeclarativeCatalogPart control contains the list of Web parts that users can add to their page. The Web parts managed by the page catalog are those statically declared in the .aspx source file. The Web parts managed by the DeclarativeCatalogPart are not instantiated and managed until they are explicitly added to the page. The following code defines new externally available Web parts:
Lesson 1
If Setup fails for any reason, it automatically rolls back the installation, removing the newly installed image and restoring the original Windows installation from its saved location. After a successful upgrade, most of these temporary folders are deleted. The $INPLACE.~TR and $WINDOWS.~Q folders are preserved, to allow you to recover files and settings that were not properly migrated.
Appraiser, but many orders of magnitude faster than brute-force cracking. Zhu Shuanglei implemented the same technique in the immensely popular Rainbow Crack tool, which can crack almost any hash format out there. Precomputed hash attacks are often referred to as Rainbow Cracks or Rainbow Table Attacks after that tool. Precomputed hash attacks have created immense media buzz, and many, many people, and many self-styled security experts have opined about how bad they are and how they work only because Windows is flawed and how Microsoft needs to fix Windows to prevent them. Typically they accompany these claims with statements about how (of course) other operating systems had the foresight to protect against these attacks. These characterizations are gross simplifications that fail to account properly for either history or reality. First, Windows is not flawed in that it does not take into account precomputed hash attacks in its design. It is true that use of a salt in the password-hashing mechanism would combat precomputed hash attacks. However, it simply was not (and still is not) an interesting threat to protect against. As I mentioned earlier, if an attacker has access to your hashes, your computer or network is already in the worst state of health you have already been hacked at least as badly as what the attacker can do with those password hashes by cracking them. Furthermore, do not be lured into thinking that the designers of competing operating systems had the foresight to protect against these attacks. Salts were added to protect against the fact that the password file was world-readable. Precomputed hash attacks were not relevant when those platforms were designed. Keeping hundreds of gigabytes, or even terabytes, of password hashes was not particularly feasible when the computer had 16KB of core memory and a tape drive. Second, it makes no sense whatsoever to start salting Windows password hashes to protect against precomputed hash attacks. Consider how the authentication protocols work. If you change the hashing mechanisms, you must also introduce a new authentication protocol because the old ones rely on the old hashes. The last time a new authentication protocol was actually retired was in Windows Vista when LM was retired. That took 13 years from the introduction of its replacement. Changing the hashing mechanism to add a salt would certainly stop precomputed hash attacks. However, it would take 13 years or so before the old NT hashes were gone. And, because password hashes are plaintext equivalent, with or without a salt, it would not solve the real problem. Anyone who claims that merely salting passwords is a necessary change to Windows either has not thought the problem through, or fails to understand it.
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