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A value from the WatcherChangeTypes enumeration indicating which type of change has been detected Returns the fully qualified name of the file or directory that the event relates to Returns the name of the changed file or directory, relative to the directory being monitored
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1. Right-click SLVideoPlayer01 in Solution Explorer.
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WSE 2.0 ships with a useful utility called the X509 Certificate Tool. You can use this tool for several purposes: Browse installed certificates in the Current User and Local Computer certificate stores. Set permissions on the keys in the MachineKeys folder, which provides access to Local Computer certificates. Retrieve the base64 key identifier for installed certificate keys. Figure 5-6 shows you the X509 Certificate Tool with a selected certificate, which in this case is the private key certificate for the Local Computer user.
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Here there are occasional delays of just over 0.2 seconds, usually accompanied by TCP retransmissions, lost segments, and duplicate ACKs. Patterns like the following in Wireshark, or another packet-capture utility, suggest that a server administrator or network administrator had implemented the TcpAckFrequency advice found in the document titled Performance Tuning Guidelines for Windows Server 2003 on Microsoft s website ( No 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Time 1.487036 1.487149 1.487194 1.487322 1.487369 1.674851 1.675434 1.675518 1.675578 1.675661 1.675763 1.675809 1.675935 1.675982 1.676108 Source server-ip server-ip server-ip server-ip server-ip client-ip server-ip server-ip server-ip server-ip server-ip server-ip server-ip server-ip server-ip Dest. client-ip client-ip client-ip client-ip client-ip server-ip client-ip client-ip client-ip client-ip client-ip client-ip client-ip client-ip client-ip Protocol Info TNS Response, Data (6), Data TCP [TCP segment of a reassembled PDU] TNS Response, Data (6), Data TCP [TCP segment of a reassembled PDU] TNS Response, Data (6), Data TCP 49196 > ncube-lm [ACK] Seq=197 Ack=12414 TCP [TCP segment of a reassembled PDU] TNS Response, Data (6), Data TCP [TCP segment of a reassembled PDU] TNS Response, Data (6), Data TCP [TCP segment of a reassembled PDU] TNS Response, Data (6), Data TCP [TCP segment of a reassembled PDU] TNS Response, Data (6), Data TCP [TCP segment of a reassembled PDU]
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This code produces the following output:
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There are several ways the framework might ensure that the appropriate methods are implemented on each business object. A formal interface or abstract base class could be used to force business developers to implement each method. Alternatively, a base class could implement Overridable methods with default behaviors that could optionally be overridden by a business developer. Finally, it is possible to use reflection to dynamically invoke the methods. Since not all objects will implement all the methods listed in Table 4-10, the idea of an interface or base class with MustOverride methods isn t ideal. Another negative side effect of those approaches is that the methods end up being publicly available, so a UI developer could call them. Of course, that would be problematic, since these methods will be designed to be called only by the data portal infrastructure. Finally, defining the methods at such an abstract level prevents the use of strong typing. Since the data types of the parameters being passed to the server by the client are defined by the business application, there s no way the framework can anticipate all the types meaning that the parameters must be passed as type Object or another very generic base type. Implementing default Overridable methods is an attractive option because it doesn t force the business developer to implement methods that will never be called. This is the approach I used in CSLA .NET 1.0, and will use in this chapter as well. However, this approach suffers from the same lack of strong typing as the interface or abstract base class approach. Which brings us to the use of reflection. Reflection is much maligned as being slow, and it is in fact slower than making a native method call. However, it offers substantial benefits as well, most notably the ability to implement strongly typed data access methods on the business objects. The purpose behind reflection is to allow dynamic loading of types and then to allow dynamic invocation of methods on those types. And that s exactly what the data portal does.
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Next, expand the wsmessaging node, right-click the Triggers node, and select the New Trigger menu option. You will see a property page, shown in Figure 9-6. Enter the configuration information as shown, selecting the Retrieval processing type.
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The easiest and most common way to display any (validation) error notification is to display it next to the UIElement control, such as with the use of the DescriptionViewer control. However, there are cases where you would like to display errors as a summary at the end of the form to improve the usability and user experience. The traditional way is to use the ListBox control at the end of the form and implement custom code to display these errors within the ListBox. However, Silverlight provides a ValidationSummary control as part of the Silverlight SDK. In order to use ValidationSummary in XAML, you must reference the System.Windows.Controls.Data.Input namespace, add as a reference to the project and distribute the System.Windows.Controls.Data.Input assembly with your application. This control provides a list of current validation errors for the container. For this you do not need to write a single line of code. For example, if we have a layout container such as Grid or StackPanel with input controls in it along with the ValidationSummary control, a list of current validation errors of the parent container will be displayed automatically. You can also point the ValidationSummary to that different layout container using the Target property. It will then detect and display validation errors that occur in any of the contained input controls of the targeted container. We will further cover this control in 6.
4-18. Detect Ray-Model Collisions Using Per-Triangle Checks
Your transaction spans data sources, especially if it spans different relational databases. For example, if your transaction is moving information from Microsoft SQL Server into an Oracle database, MSDTC is an excellent option for managing the transaction. Your application has complex requirements around transactional composition. In this case, your services are designed to do different, autonomous pieces of work. Transaction coordinators are written that call these different services to accomplish a specific business process. The number of ways these services can be combined is high, or the requirements change and evolve often, and you anticipate introducing new transaction coordinators as newer versions of the product are introduced. Your application has customizable functionality, such that an end user, power user, or administrator has a tool that can affect how services are combined to do transactional work. As a corollary to these guidelines, if you can meet your transactional requirements with another resource manager, your solution will probably perform better. One option may be using transactions within SQL Server Transact-SQL (TSQL). This limits the transaction to a single command execution from your data access code. A stored procedure can call other stored procedures to enlist in the work of the transaction. Another option is to use ADO.NET transactions. These transactions are tied to a connection so that many commands can be executed against a single data store and enlisted in a single transaction. You can use this to dynamically generate SQL or to combine multiple stored procedure calls. These options are not nearly as flexible as COM+ transactions, but they are much better performers; thus, you should leverage them when they can do the job. See 12 for information on the transactional infrastructure built into the .NET Framework 2.0, which gives you options for upgrading transactions dynamically; this way, only the resource managers needed get enrolled on an as-needed basis.
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