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Printer Data Matrix ECC200 in visual C#.net OVERVIEW OF .NET APPLICATION ARCHITECTURE

CHAPTER 2: T yping Tips, Copy/Paste, and Search
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Factory Method
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SILVERLIGHT CONCEPTS
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CHAPTER 14 ARRAYS
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To deploy your application to the cloud you will need a Windows Azure account. If you do not have one yet, what are you waiting for Go and sign up for one now at http://www.microsoft.com/ windowsazure/account/.
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CHAPTER 23 OTHER TOPICS
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Define and use native types Define and use managed types Define native functions Define managed functions Native instructions* Managed instructions (IL) Build 32-/64-bit agnostic assemblies Use the .NET Framework Use the CRT Use the Standard C++ Library Use ATL Use MFC App domain aware Reflection on built assembly Call functions via P/Invoke
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Option
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Figure 3-3. Top SQL section from an ASH report
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WS-Security Authentication and Digital Signatures with Web Services Enhancements Matt Powell (Microsoft) Whitepaper (December 2002) Located at MSDN Home Web Services Home Building Web Services Enhancements (WSE)
Figure 20-10. The compiler produces a class that is both an enumerable and an enumerator. It also produces the method that returns the class object.
that folder, find the appropriate CreateTable file (either 2000 or 2005) for your SQL Server and execute that file on the database. This creates the table tblPurchaseOrders. Within the SQL folder in the 2 folder, you ll also find a VB file called SQLDBAccess.vb. You ll use this file throughout the book to provide data access code, so you don t need to re-create that code in each chapter. If you re unfamiliar with OOP concepts, this is a class file, and will be used as a class. By using this file as a class, you can access its functionality many times. Create a new VB Sequential Workflow Console Application called VBPurchaseOrderConsole. You ll also find this application already completed in the 2\VBPurchaseOrderApplication folder. Change the name of the workflow file (workflow1.vb) to PurchaseOrderProcess.vb. Right-click the workflow and add the following private variables to be used by the public properties (which will receive the parameters): Private Private Private Private Private Private Private StrPurchaseOrderNumber as string StrPartNumber as string DtePurchaseDate As Date DteExpectedDate As Date StrBuyerLogin As String StrBuyerName As String IntQuantityOrdered As Integer
Figure 10-5. Migrated row depiction So, a migrated row is a row that had to move from the block it was inserted into onto some other block. Why is this an issue Your application will never know; the SQL you use is no different. It only matters for performance reasons. If you go to read this row via an index, the index will point to the original block. That block will point to the new block. Instead of doing the two or so I/Os to read the index plus one I/O to read the table, you ll need to do yet one more I/O to get to the actual row data. In isolation, this is no big deal you won t even notice it. However, when you have a sizable percentage of your rows in this state, with many users accessing them, you ll begin to notice this side effect. Access to this data will start to slow down (additional I/Os and the associated latching that goes with the I/O add to the access time), your buffer cache efficiency goes down (you need to buffer two blocks instead of just the one you would if the rows were not migrated), and your table grows in size and complexity. For these reasons, you generally do not want migrated rows (but do not lose sleep if a couple hundred/thousand rows in a table of thousands or more rows are migrated!). It is interesting to note what Oracle will do if the row that was migrated from the block on the left to the block on the right in Figure 10-5 has to migrate again at some future point in time. This would be due to other rows being added to the block it was migrated to and then updating this row to make it even larger. Oracle will actually migrate the row back to the original block and, if there is sufficient space, leave it there (the row might become unmigrated). If there isn t sufficient space, Oracle will migrate the row to another block altogether and change the forwarding address on the original block. As such, row migrations will always involve one level of indirection. So, now we are back to PCTFREE and what it is used for: it is the setting that will help you to minimize row migration and row chaining (discussed later) when set properly.
The Save() method is implemented in BusinessBase and BusinessListBase, and typically requires no change or customization. Remember that the framework s Save() method includes checks to ensure that objects can only be saved if IsValid and IsDirty are True. This helps to optimize data access by preventing the update of invalid or unchanged data.
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