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In this chapter, I ll show you how to add data members to a type. Specifically, we ll look at constants and fields.

You can configure the number of columns and rows the IFrame will span. The column layout will be limited to the number of columns specified in the layout of the tab, header, or footer in which you added the IFrame.

Disabled unless connection sharing is necessary through this computer . Most networks would use a router to provide this functionality . Disabled unless IPv6 over IPv4 is in use, which is not common .

Step Into, Step Over, and Step Out Now that I've described breakpoints and the symbol engine, I want to explain how debuggers implement the excellent Step Into, Step Over, and Step Out functionality. I didn't implement these features in WDBG because I wanted to concentrate on the core portions of the debugger. Step Into, Step Over, and Step Out require source and disassembly views that allow you to keep track of the current executing line or instruction. After you read the discussion in this section, you'll see that the core architecture of WDBG has the infrastructure you need to wire these features in and that adding these features is mostly an exercise in UI programming. Step Into, Step Over, and Step Out all work with one-shot breakpoints, which are breakpoints that the debugger discards after the breakpoints trigger. Step Into works differently depending on whether you're debugging at the source level or the disassembly level. When debugging at the source level, the debugger must rely on oneshot breakpoints because a single high-level language line translates into one or more assembly language lines. If you set the CPU into single-step mode, you would be singlestepping individual instructions, not the source lines. At the source level, the debugger knows the source line you're on. When you execute the debugger's Step Into command, the debugger uses the symbol engine to look up the address of the next line to execute. The debugger will do a partial disassembly at the next line address to see whether the line is a call instruction. If the line is a call instruction, the debugger will set a one-shot breakpoint on the first address of the function the debuggee is about to call. If the next line address isn't a call instruction, the debugger sets a one-shot breakpoint there. After setting the one-shot breakpoint, the debugger will release the debuggee so that it runs to the freshly set one-shot breakpoint. When the one-shot breakpoint triggers, the debugger will replace the opcode at the one-shot location and free any memory associated with the one-shot breakpoint. If the user is working at the disassembly level, Step Into is much easier to implement because the debugger will just force the CPU into single-step execution. Step Over is similar to Step Into in that the debugger must look up the next line in the symbol engine and does the partial disassembly at the line address. The difference is that in Step Over, the debugger will set a one-shot breakpoint after the call instruction if the line is a call. The Step Out operation is in some ways the simplest of the three. When the user selects the Step Out command, the debugger walks the stack to find the return address for the current function and sets a one-shot breakpoint on that address. The processing for Step Into, Step Over, and Step Out seems straightforward, but there's one small twist that you need to consider. If you write your debugger to handle Step Into, Step Over, and Step Out, what are you going to do if you've set the one-shot breakpoint for those cases and a regular breakpoint triggers before the one-shot breakpoint As a debugger writer, you have two choices. The first is to leave your one-shot breakpoints alone so that they trigger. The other option is to remove your one-shot breakpoint when the debugger notifies you that a regular breakpoint triggered. The latter option is what the Visual Studio .NET debugger does. Either way of handling this case is correct, but by removing the one-shot breakpoint for Step Into, Step Over, and Step Out, you avoid user confusion. If you allow the one-shot breakpoint to trigger after the normal breakpoint, the user can easily be left wondering why the debugger stopped at an odd location.

<Area Id="SFA" ResourceId="Area_Sales" Icon="/_imgs/sales_24x24.gif" DescriptionResourceId="Sales_Description">

Primary In this kind of zone, the zone data provides the original source data for all domains in the zone. Zone data can be backed up from this zone to a second ary zone. Secondary This kind of zone is an authoritative backup zone for the primary zone or for other secondary zones. Stub This server hosts a stub zone, which is a copy of a zone containing only those resource records necessary to identify the authoritative DNS servers for the master zone.

Syntactical Shortcut #3: No Need to Wrap Local Variables in a Class Manually to Pass Them to a Callback Method

Encoder Description Properties Static read-only property used to get an ASCIIEncoding instance. ASCII BigEndianUnicode Static read-only property used to get a UnicodeEncoding instance configured for big-endian byte ordering. Gets the name for the encoding that can be used in mail agent body tags. BodyName Gets the code page identifier for the encoding. CodePage Static read-only property used to get an encoding for the system's Default current ANSI code page. Gets a human-readable name for the encoding. EncodingName Gets the name for the encoding for use in mail agent header tags. HeaderName IsBrowserDisplay Gets an indication of whether the encoding can be used for display in browser clients. Gets an indication of whether the encoding can be used for saving by IsBrowserSave browser clients.

Ruby Standard Library Documentation (http://www.ruby-doc.org/stdlib/): Documentation for the Ruby standard libraries in Ruby 1.8 (at the time of writing). Each library is presented separately, making it easier to read than the core documentation. RubyForge (http://rubyforge.org/): The home for open source Ruby projects. Any Ruby developer can sign up and promote his or her own libraries, or simply download existing libraries for free. RubyForge hosts the default RubyGems repository (see 7). GitHub is quickly becoming a more popular place to host open source Ruby projects, however. Ruby Application Archive (http://raa.ruby-lang.org/): A repository of applications and libraries for Ruby. It has largely been superseded by RubyForge (and to a certain extent, GitHub), but is still used to host a number of projects. Programming Ruby: The Pragmatic Programmer s Guide, First Edition, by David Thomas and Andrew Hunt (Addison Wesley Longman, 2001) (http://www.rubycentral.com/book/): A free, online copy of the first edition of a Ruby book, targeted to an old version of Ruby (1.6, at the time of writing). Ruby Quickref (http://www.zenspider.com/Languages/Ruby/QuickRef.html): A quick-fire set of references and reminders that act as a cheat sheet for Ruby, listing reserved words, regular expression syntax, language constructions, special variables, and more.

Sometimes a simple mathematical transformation isn t powerful enough to make the jump from data like Age to a table key. Some such cases are suited to the use of an indexed access scheme. When you use indexes, you use the primary data to look up a key in an index table and then you use the value from the index table to look up the main data you re interested in. Suppose you run a warehouse and have an inventory of about 100 items. Suppose further that each item has a four-digit part number that ranges from 0000 through 9999. In this case, if you want to use the part number to key directly into a table that describes some aspect of each item, you set up an index