c# qr code generator library ChAPTER 12 in C#.net

Get QR-Code in C#.net ChAPTER 12

Something you know Something you have Something you are
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On most systems, you don t need to take any special configuration steps to set up a network adapter, regardless of whether it s for an Ethernet, wireless, or HomePNA adapter. The Plug and Play code in Windows handles all the work of installing drivers. If you install an internal adapter and Windows includes a signed driver for that adapter, the driver should be installed automatically when Windows detects the adapter (if Windows cannot find a built-in driver, you ll be prompted to supply the location of the driver files). For an external adapter connected to a USB or IEEE 1394 port, the driver installs like one for an internal adapter, and thereafter loads and unloads dynamically when you attach or remove the adapter.
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Securing the Branch Office
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<Grid x:Name="LayoutRoot"> <data:DataGrid></data:DataGrid> </Grid> 3. 4. Build the application by selecting Build Build Solution from the main menu.
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Part I Overview and Configuration
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8 CROSS-REFERENCE
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The XML reader will loop through the nodes, moving from one record to the next, as shown here: void ProcessNotes(XmlTextReader reader) { try { while(reader.Read()) { if (reader.NodeType == XmlNodeType.Text) MessageBox.Show(reader.Value); } } catch {} finally { MessageBox.Show("Closed..."); } } The connection remains open until the reader is closed. Next store the results in a string variable and use that string to create a new XmlTextReader object. (See 2.) This technique gives you an extra advantage: you can work with the reader while you are disconnected from the database. An XML Reader for Data Readers An XML reader can work on top of different data containers, including streams, files, and text readers. By writing a custom XML reader, you can also navigate non-XML data using the same XML reader metaphor. In this case, you create a virtual XML tree and make the underlying data look like XML. (In 2, you learned how to visit CSV files the XML way.) The ability to expose result sets via XML is specific to SQL Server 2000 and potentially to any other native managed provider for DBMS systems with full support for XML queries. You can't, for example, use the ExecuteXmlReader method with an object of class OleDbCommand. Recall from the section "Under the Hood of ExecuteXmlReader," on page 366, the internal structure of ExecuteXmlReader. The ExecuteXmlReader method simply creates an XML text reader based on the internal stream used to carry data back and forth. What about creating a custom XML reader by building a virtual XML tree around the provider-specific data reader In this way, you could easily extend any .NET Framework data provider by using the ExecuteXmlReader method. This method is not as effective as using the internal stream, but it does work and can be applied to all data providers. Building the XML Data Reader Let's rework the CSV reader example from 2 and build an XmlDataReader class inheriting from XmlReader, as follows: public class XmlDataReader : XmlReader { 299
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TABLE 4-1
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NOTE E
For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.
When naming constants, name the abstract entity the constant represents rather than the number the constant refers to. FIVE is a bad name for a constant (regardless of whether the value it represents is 5.0). CYCLES_NEEDED is a good name. CYCLES_NEEDED can equal 5.0 or 6.0. FIVE = 6.0 would be ridiculous. By the same token, BAKERS_DOZEN is a poor constant name; DONUTS_MAX is a good constant name.
Part III:
Entering Formulas
Dynamic Data, XBAP, MVC, AJAX, and Silverlight
Page 241 Specifying a Profile for Presentation Playback When you publish your presentation to a Web server and distribute it with multiple profiles over a network, you can send your audience a separate playback address for each one. This is how you match the various profiles to your audience. If, for example, you offer two bit rates, such as 300Kbps and 33.6-Kbps, viewers can choose which address (and therefore profile) best fits their connection speed. You can do this whether the viewer types the address into the Internet Explorer Address Bar or you create HTML links to your presentation. To understand how to create the addresses, it helps to know how the Publish Wizard works when it encodes multiple profiles. When going through the Publish Wizard: 1. Producer generates a list of valid profiles and displays them in the Publish Wizard as check box items. 2. You click the check boxes to select the profiles you want to use for publishing. 3. Behind the scenes, Producer assigns an index number to each profile you select, starting with the highest bit rate profile and counting up from zero. For example, if you only select one profile, it has the index number 0 by default. If you select three profiles, they have index numbers 0, 1, and 2, with 0 corresponding to the highest bit rate profile you selected, and 2 corresponding to the lowest. After you complete the Publish Wizard, Producer automatically creates separate Windows Media files for each profile you select, and copies each file to the appropriate destination folder. Producer also creates and copies a Windows Media metafile (with a .asx file name extension) for each profile. This metafile is called a playlist. The playlist acts as a shortcut to the Windows Media files. Producer names each playlist by prefixing the word Media with an index number that corresponds to the profile you selected, such as 0Media.asx, 1Media.asx, 2Media.asx, and so forth. Each playlist is a shortcut to the Windows Media file that was encoded using the profile that corresponds to the index number in the playlist file name. If you publish a presentation using an e-service, the index numbers may not be assigned to each profile in the order mentioned previously. E-service authors have control over how profiles are numbered, so you may need to inquire about this information from the e-service provider. To create a playback address for each profile, append a # character as a separator character to the playback address, and then append the text profile= index number (without
double nominal = 1.0; double sum = 0.0; for ( int i = 0; i < 10; i++ ) { sum += 0.1; } if ( nominal == sum ) {
Check for overflow in intermediate results The number at the end of the equation isn t the only number you have to worry about. Suppose you have the following code:
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