WORKING WITH THE DATA in visual C#

Printer Data Matrix in visual C# WORKING WITH THE DATA

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The storage space used by your files is usually more than adequate in current hosting packages, unless you have an exceptionally large number of images or files. Many hosting companies cheapest packages allow from 500MB of storage to as much as 4GB. Some offer considerably less. I would steer clear of those. As a rough guide to how much space you might need, WordPress itself, including the built-in themes and perhaps a couple more themes, is unlikely to be more than 2MB. But if you have a lot of images, photographs, product images, maps, charts, and so on, this amount can soon increase. My main web site uses just over 150MB for around 1,800 images, 70% of which are high-resolution photographs. If you were to store high-quality MP3 music files, then 350 such files might use up 1GB. If you stored lower-quality speech files, 350 of them might take only 400MB. The space taken by your database is significantly less. For example, my main blog with 1,100 posts and 58,000 comments uses just 21MB of storage space. You will need to monitor your storage space usage regularly. The way you check exactly how much space you are using is different from one hosting company to another. Generally, you can expect your administration pages, or control panel, to have an option to calculate the space you have used. How often you should check depends on how quickly your blog grows. That growth rate is something you will need to judge for yourself. Start by checking once a week and make a judgment after a month or two. If you are allocated, say, 1GB, and after a month, you ve used 10MB, then you don t really need to check too often. A monthly check should be enough to give you plenty of warning before you start to run out. If, after a couple of months, you ve used 400MB, you will need to monitor it more closely, perhaps on a weekly basis. If you do find yourself running low on space, or at least heading that way, you have several options. If you have a lot of high-resolution images, you should consider replacing the older ones with lower-resolution versions, if that won t detract from the value of your old posts. Similarly, if your community blog is a support site for your software and you offer downloads, you could consider removing the older versions. But make sure any old posts that link to them are updated. You don t want to leave bad links in your old posts. I ll show you how to check for bad links later in this chapter, in the Checking Your Links section. With regard to your database, there isn t really a lot you can do to reduce its size. The bulk of your database is your content: your posts and pages, your visitors comments, and your links. You don t want to get rid of any of that because it is the lifeblood of your blog. However, the spam comments can go, as described next.
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Figure 10-1. Mashup example source: housingmaps.com As a metaphor for a mashup, take this example from real life: a client hires a detective agency. As a result of the client s request for an investigation, a few detectives are assigned to handle the case. The detectives check all sorts of clues (data sources) found on the Internet, in public records, at the scene itself, etc. All of these clues (data) are processed, filtered, and formed to determine an answer. At that point, the responce is presented to the client with the findings of the investigation (Mashup). In recent years, the Web has been going through a transformation into what many call Web 2.0, a term first used by O Reilly to describe the transformation of the Web into a sharing and collaborative vehicle. To learn more, visit http://www.oreillynet.com/pub/a/oreilly/tim/news/2005/09/30/what-isweb-20.html.
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Figure 3 50. Configuring a Script functoid to call inline C#
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Encapsulate junk mail as MIME attachment: Moves mail flagged as spam into an attachment, which requires user interaction before the mail client will attempt to parse and present the message. Enable virus filtering: Enables ClamAv scanning for incoming
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If implementation inheritance is used, you should in many cases consider making all implementing classes private or hiding all implementing classes behind a signature. For example, the Microsoft.FSharp.Collections.Seq module provides many implementations of the seq<'T> interface but exposes no implementation inheritance. Nevertheless, hierarchies of classes are important in domains such as GUI programming, and the technique is used heavily by .NET libraries written in other .NET languages. For example, System.Windows.Forms.Control, System.Windows.Forms.UserControl, and System.Windows.Forms.RichTextBox are part of a hierarchy of visual GUI elements. Should you want to write new controls, then you must understand this implementation hierarchy and how to extend it. 11 shows a complete example of extending UserControl. However, even in this domain, implementation inheritance is often less important than you may think, because these controls can often be configured in powerful and interesting ways by adding function callbacks to events associated with the controls. Here is a simple example of applying the technique to instantiate and extend the partially implemented type TextOutputSink: /// An implementation of TextOutputSink, counting the number of bytes written type CountingOutputSinkByInheritance() = inherit TextOutputSink() let mutable count = 0 member sink.Count = count default sink.WriteChar c = count <- count + 1; System.Console.Write c The keywords override and default can be used interchangeably; both indicate that an implementation is being given for an abstract member. By convention, override is used when giving implementations for abstract members in inherited types that already have implementations, and default is used for implementations of abstract members that didn t previously have implementations. Implementations are also free to override and modify default implementations such as the implementation of WriteString provided by TextOutputSink. Here is an example: { new TextOutputSink() with member sink.WriteChar c = System.Console.Write c member sink.WriteString s = System.Console.Write s } You can also build new partially implemented types by extending existing partially implemented types. The following example takes the TextOutputSink type from the previous section and adds two abstract members called WriteByte and WriteBytes, adds a default implementation for WriteBytes, adds an initial implementation for WriteChar, and overrides the implementation of WriteString to use WriteBytes. The implementations of WriteChar and WriteString use the .NET functionality to convert the Unicode characters and strings to bytes under System.Text.UTF8Encoding, documented in the .NET Framework class libraries:
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What should you know about datasets Well, all you have to know is how to create a dataset and a data table inside the dataset. Starting in 4, you ll notice that each reporting project makes use of a dataset. The data table inside the dataset is identical in
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Once the cursor is within a table, you can move from cell to cell using the Tab key. Alternatively, you can move backward through the cells by pressing Shift+Tab. To add more rows or columns, click the relevant icon on the Table toolbar (the fourth and fifth buttons on the bottom row). To split an existing cell, ensure your cursor is inside it, right-click, select Cell from the menu, and then click Split. If you want to total figures within a table, click in an empty cell, and then click the Sum icon on the Table toolbar (the Greek sigma symbol on the right side of the bottom row). This is similar to inserting a function in a spreadsheet. The cell holds the formula for the sum and clicking additional cells, or a range of cells, adds them to the sum.
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4. Please add the following columns into the data table: your data table should look like Figure 7-6: CustomerID (System.String) FirstName (System.String) LastName (System.String) EmailAddress (System.String) CountryRegionName (System.String)
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Exposing an Existing Application As a Portlet
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Within a BizTalk orchestration, you can call or start other orchestrations without sending a message outside an orchestration s context. BizTalk orchestrations can function as traditional functions, calling one another synchronously or asynchronously. Using the Call Orchestration shape allows a parent orchestration to call a child orchestration with a set of parameters and receive output back (synchronous). Using the Start Orchestration shape allows a parent orchestration to call a child orchestration with any set of parameters and move on, independent of receiving a result back (asynchronous). As an example, assume that you would like to synchronously call an orchestration to perform a validation routine on a message. 1. 2. 3. 4. Open the BizTalk project that contains the orchestration that you would like to perform the Call Orchestration functionality. Drag a Call Orchestration shape from the toolbox onto your design surface. Click the exclamation mark (tool tip) on the shape. Select No Called Orchestration Click to Configure. The Call Orchestration Configuration dialog box appears. In the Call Orchestration Configuration dialog box, select the orchestration you wish to call, as shown in Figure 5 31. In this dialog box, you can also select parameters that can be passed by an orchestration. Parameters are passed in the form of .NET variables. Only orchestration types that have Activation set to False that is, only orchestrations that are invoked from another process will be available for selection. In this instance, this is the calling orchestration rather than message instantiation.
Breakpoints
The code creates an XmlTextWriter object by passing the path of the destination XML file to the constructor. Then a FileStream is created for reading data from the image file. The contents of the file are read by using the Read() method of the FileStream class, which accepts three parameters: the byte array to read the data into, the start index in the byte array from where the writing should start, and the length of data to read. The XmlTextWriter then starts writing the document. It first writes the XML processing instruction and the <imagefile> element. The <imagefile> element has two attributes: filename and size. The filename attribute stores the complete path of the image file that is being serialized as XML. The size attribute contains the size of the source image file. Image files contain nontextual data. You have a couple of options when you want to serialize nontextual data into XML files. You can use either hexadecimal encoding or Base64 encoding for the serialization. In our example, we use Base64 encoding. To write data into Base64 format, the XmlTextWriter class provides a method called WriteBase64(), which accepts three parameters: a byte array that contains the nontextual data, the index of the byte array from which the writing should start, and the length of data to write. The WriteBase64() method writes the supplied byte array as a Base64 string inside the destination XML element. Figure 3-17 shows how the XML file looks after serializing an image file.
After the installation, when you first open the software, you ll see a screen asking you to choose a method for creating your package (see Figure 6-21). Select PREINSTALLED on the left-hand side of the screen and you ll see a listing of each software package installed on the computer. Select the appropriate titles (or use Command-A to select them all) and click on the Choose button.
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