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How to read, scan, decode Data Matrix images in VB . NET class, ASP.NET Web & Windows applications.

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The VB . NET Data Matrix Barcode generator , provided by KeepDynamic.com, is a professional and highly-rated 2D (two-dimensional) barcode creator library. It helps . NET developers easily create Data Matrix barcodes in VB . NET projects.

We have been told endlessly that we should always include an order by clause if we want the data in a specific order, and not rely on an accidental sort performed by the group by. Although this is a dictate that we ought to follow unswervingly, that doesn t mean the optimizer actually has to perform both operations if it can find a cheaper alternative.

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An exception is a violation of an implicit assumption made by your code. For example, suppose that your application contains code to open a file that it depends on, but it doesn t first check that it can actually open the file. Here, your application is making an implicit assumption that the file will always be accessible. What happens if, when the code executes, it cannot access that file (for example, because it s missing or because the application doesn t have enough privileges to access it) The underlying .NET Framework class responsible for opening the file recognizes the reason why it can t open the file, and it throws an exception. When an exception is thrown, the exception dictates the application s subsequent execution path: If the application is able to catch the exception, then it will. For this to happen, the application must contain special exception-handling code. This kind of code is generally designed both to catch the exception and to handle it in a controlled way. If the application is unable to catch the exception, then it will bubble it up and eventually be caught by the CLR. This will result in an unfriendly exception message appearing on the page in the browser. This is the most undesirable result, and the one you want to avoid.

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vb.net data matrix reader

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There is an interesting follow-up to this point, though. In 9i, Oracle introduced a new algorithm for multicolumn aggregation. Script gby_onekey.sql in the online code suite demonstrates the principle. I have generated a small random data set, and queried it with the following SQL statement: select col1, col2, count(*) from t1 group by col1, col2 ; The output looks like this: COL1 ---A B B Y Z ... AD CC CE ... COL2 COUNT(*) ---- ---------Y 1 V 1 Y 1 TO 1 DU 1 K K DZ 1 1 1

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Of course, in the example of the code that opens a file, you could code the application to check that the file is accessible before it tries to open it, and to take an alternative execution path if the file is inaccessible. Then a missing file would no longer be an unexpected occurrence, and no exception would be thrown. But realistically, it s impossible to code for all of the many things that can go wrong. Your code should also be ready to catch general exceptions thrown as a result of unexpected situations. So, in fact, the example above tells us two things: When it s possible, we should avoid implicit assumptions in our applications, by writing code in our applications to anticipate places where things can go wrong and check for them. We should also include exception-handling code in our applications, in order to deal with those exceptions that we cannot anticipate. It s clear from the discussion so far that exceptions are a good way to deal with unexpected situations and errors (in particular, input errors) such as missing files, unexpected user input, and network failures. However, it s also worth noting that not all exceptions are thrown in this way. In fact, .NET also allows you to throw exceptions deliberately, so you can force the application to throw an exception in reaction to an expected problem. In the remainder of this chapter, we ll talk about exceptions: throwing them, catching them, and handling them.

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