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The two main SOAPNET objects you ll use are the WSOperation and SoapMessage objects The WSOperation handles creating a request message object and sends it using an HttpTransport object SoapMessage exposes methods and properties that help you create the request message and parse the response message including Faults if any The example in listing 12-14 creates a WSOperation object then calls its Open method which takes the Web service URL and the SOAP Action Calling WSOperationOpen returns a SoapMessage object that represents the request message The WSOperation also exposes an HttpConnection property which can be used to set an HTTP proxy as in this example To create a SOAP request message, you first call BeginMessage indicating whether the message is RPC/encoded or document/literal Assuming the message is RPC/encoded as in this example, you then call AddRPCOperationElement and specify the operation s name, namespace prefix, and namespace URI In this example, the operation is called getElementBySymbol (it returns an element from the periodic table given its symbol) For each operation part (ie method parameter) you then call AddRPCPart and specify the part name and value In this example, the part s name is name and its value is the string na In addition to simple types such as strings and integers, AddRPCPart will also accept objects and arrays and will serialize them according to Section 5 encoding rules When you have finished writing the message, you call SoapMessageEndMessage When you call WSOperationSend, the request message is sent and the response message is parsed into another SoapMessage object that is returned from the Send method To determine whether the operation succeeded, you check the SoapMessageHasFault property which returns True if there was an error The procedure named ShowResults in listing 12-14 first checks for errors If there was a SOAP Fault returned, it will be accessible to you as the response message s Fault property which is simple a SoapException If there are no errors, you can read the returned information using the response message s BodyItems property which returns an XmlNodeList In the case of RPC/encoded messages, this list contains all XmlNode objects returned by the remote method call (ie the nodes inside the <methodCallResponse>.

.net ean 13 reader

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The HTML source for our sample, shown Listing 1114, contains a Fade animation that targets the BannerImage control and runs for a duration of 3 seconds We could have chosen almost any type of animation as long as it occurred when the OnLoad event red on the BannerImage image control This exibility provides a JavaScript-free way to set up animations of any type when a pattern such as this is used In fact, this is exactly how the Animation extender works; and if it weren t for the way it handles the OnLoad event, we would have used it in our example

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EAN13 Barcode Control - CodeProject
16 Sep 2008 ... Demonstrates creating EAN - 13 Barcodes with VB. NET . ... programs for hand held devices which came with an integrated barcode reader .

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Creating EAN - 13 Barcodes with C# - CodeProject
19 Apr 2005 ... NET 2005 - 7.40 Kb ... The EAN - 13 barcode is composed of 13 digits, which are made up of the following sections: the first 2 or 3 digits are the ...

In this case, the Notifier instance holds onto aReceiver reference and is hard-coded to notify that reference when it receives new information Such a tight coupling between Notifier and Receiver makes sense when oneNotifier instance must notify only one Receiver instance If that circumstance changes and a Notifier instance must notify numerous Receiver instances, or instances of other classes, the design must evolve This is exactly what occurred on Kent Beck and Erich Gamma's JUnit framework [Beck and Gamma] When users of the framework needed more than one party to observe changes to a TestResult instance, a hard-coded notification was refactored to use the Observer pattern (see the Example section for details) Every implementation of the Observer pattern leads to loose coupling between a subject (a class that is the source of notifications) and its observers The Observer interface makes this loose coupling possible To be notified of new information, a class need only implement the Observer interface and register itself with a subject The subject, in turn, holds onto a collection of instances that implement the Observer interface, notifying them when changes occur Classes that play the role of subject must contain a method for adding Observers and can optionally contain a method for removing Observers If there is never a need to remove Observers during the life of a subject instance, there's no need to implement the remove method Although this seems like basic common sense, many programmers fall into the trap of implementing this pattern exactly as they see its structure defined on class diagrams in books Two common Observer implementation problems to watch out for involve cascading notifications and memory leaks Cascading notifications occur when a subject notifies an observer, which, by also playing the role of subject, notifies other observers, and so on The result is an overly complicated design that's difficult to debug A Mediator [DP] implementation may help improve such code Memory leaks occur when an observer instance is not garbage collected because the instance is still referenced by a subject If you remember to always remove your observers from their subjects, you'll avoid memory leaks The Observer pattern is used often Because it isn't difficult to implement, you may be tempted to use this pattern before it's actually needed Resist that temptation! If you begin with a hard-coded notification, you can always evolve a design to use an Observer when you genuinely need one.

.net ean 13 reader

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Net is a port of ZXing, an open-source, multi-format 1D/2D barcode image processing library ... With the Barcode Reader SDK, you can decode barcodes from.

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element) In the case of document/literal messages, this list contains all XmlNode objects inside the response Body element That s all fine, but how does this help when the service requires a specific envelope namespace prefix like the CodeCraze newsgroup service The SoapMessage class exposes fields that let you set all namespace prefixes used in SOAP messages, including the SOAP envelope namespace prefix Listing 12-15 shows how to invoke the CodeCraze newsgroup service with SOAPNET Listing 12-18 Invoking a PHP Web service using SOAPNET (VBWSClientCode\12 \DotNetClient\Form1vb)

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The AJAX Control Toolkit comes with quite a bit of functionality that you can use to create truly interactive extenders that require much less coding than if you were to use the ASPNET 20 AJAX Extensions directly As you learned in this chapter, the toolkit provides a much richer environment for creating extender controls than using the ASPNET 20 AJAX Extensions alone In addition, the toolkit includes myriad controls you can either use or build on, making the toolkit a compelling alternative

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