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The FCL ships 60 classes that implement the IAsyncResult pattern, including the following classes for which there is no equivalent class available that implements the EAP: the various Stream-derived classes (FileStream, IsolatedStorageFileStream, DeflateStream, GZipStream, and PipeStream), SqlCommand, and more . I should also point out that tools that produce Web service proxy classes, like WSDL .exe and SvcUtil .exe, can produce proxy classes that support both the APM and the EAP . If you look at the 17 classes listed above, they are all related to performing I/O-bound work except for one: BackgroundWorker . The BackgroundWorker class is designed for doing asynchronous compute-bound work, but unfortunately, a lot of developers use BackgroundWorker to perform synchronous I/O-bound work, which blocks a thread . I/Obound work should be performed using one of the other 16 EAP classes or any of the classes that support the APM . The BackgroundWorker class offers the following three events:

In both JDBC and ADO.NET, connection objects act as factories for creating command objects. The JDBC Connection interface defines methods for creating instances of the Statement, PreparedStatement, and CallableStatement interfaces: the createStatement, prepareStatement, and prepareCall methods, respectively. The ADO.NET equivalent is the IDbConnection.CreateCommand method; CreateCommand takes no arguments and returns an IDbCommand instance. Use of the CreateCommand method can be seen at the start of the InsertPeople, DeletePeople, and SetAge methods of DBDemo. Both the SQL and OLE Data Provider implementations of IDbCommand can be instantiated using constructors; however, use of the CreateCommand factory method ensures that the correct implementation of IDbCommand is always instantiated, provides default configuration for IDbCommand, and improves code portability.

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15. Compare the traffic in the Name Resolution 2 file to the traffic in the Name Reso lution 1 file saved in the My Captures folder on Computer1. Then answer the fol lowing questions in the spaces provided. What is the essential difference between the two captures

In Name Resolution 2, the first two frames are a DNS query and DNS response for the name computer1.domain1.local. In Name Resolution 1, the NetBIOS over TCP/IP (NetBT) protocol was used to resolve the name Computer2 on the LAN. This difference shows that DNS has replaced NetBIOS as the name resolution method on the network.

DoWork The method that you register with this event should contain the compute-

In Windows Server 2003 networks, DNS name resolution is attempted before NetBIOS name resolution. NetBIOS resolution was performed in the first example because DNS was not fully configured on the network.

This chapter introduces assemblies, which are the .NET unit of deployment, reuse, versioning, and security. Assemblies are a logical rather than a physical structure and include one or more modules and resources. Assemblies are self-describing, containing metadata in a manifest that describes the contents and dependencies of the assembly. The assembly manifest is the link between the data types contained in an assembly and the common language runtime (CLR). The CLR relies on the metadata in the assembly to load the assembly and required libraries, enforce security policies, handle version support, and perform type validation.

the code that updates the UI with progress information . This event is always raised on the GUI thread . The DoWork event handler method must periodically call BackgroundWorker s ReportProgress method to raise the ProgressChanged event .

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the code that updates the UI with the result of the compute-bound operation . This event is always raised on the GUI thread . The DoWork event handler method is passed a reference to a DoWorkEventArgs object . This object s Result property must be set to the value that the compute-bound operation wishes to return .

9. What is the restriction that applies to clients running Microsoft Windows 95 and Microsoft Windows NT 4 SP3 or earlier

This section demonstrates how to compile C# source files by using the C# compiler, csc.exe. This is a simple process, similar to using the javac compiler. The significant difference is the result of the compilation process, which we'll discuss in the "Assemblies" section later in this chapter. The csc.exe application can be found in the main directory of the .NET Framework installation, typically C:\<windows directory>\Microsoft.NET\Framework\v<version number>. As is the case with the other .NET command-line tools, csc.exe will not be added to your PATH environment variable during the installation process, so you'll need to do it manually. The following code represents the C# Hello World! application:

By default, these clients will not be able to log on to a domain through a domain controller run ning Windows Server 2003.

In the Converting the IAsyncResult APM to a Task section earlier in this chapter, I showed how to use the IAsyncResult APM to turn an asynchronous operation into a Task so that it could be used with the rest of the Task infrastructure . Well, it is also possible to turn an asynchronous operation using the EAP into a Task . The System.Threading.Tasks namespace defines a TaskCompletionSource class that looks like this:

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