ean 13 check digit c# Lesson 1: Creating a Client Application to Access a Remote Object in C#

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Lesson 1: Creating a Client Application to Access a Remote Object
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//C# Console.WriteLine(newPatient.PersonalInformation());
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9. On the Build menu, click Build LabConsumer to compile the project. After the project successfully builds, press Ctrl+F5 to start the program without debug ging. The console output should render something similar to this:
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Patient ID: 001 :: John Doe :: 123 Main Street :: Someplace, AZ 85000 01/12/2001; Diagnosis: cold | Treatment: take 2 and call me in the morning. 03/04/2005; Diagnosis: broken toe | Treatment: nothing.
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10. Close the console window for the LabConsumer project and the LabServer project.
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Lesson Summary
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There are two types of remotable objects: marshal-by-value and marshal-by reference. Marshal-by-value objects are serialized on the hosted server, transported to the client machine, deserialized, and behave as a locally defined object. Marshal-by-reference objects reside on the hosted server and calls from the client are transported to the object. A proxy object is used to serve as a local client representation of a marshal-by reference object so that the object appears to be a local object although it is on the server. There are two types of proxy objects: transparent proxy and real proxy. Real proxy is the base class for the transparent proxy. Real proxy can be extended to create custom proxy classes. The URL where a remote object can be located is required to successfully con nect to the object when connecting via HTTP or TCP. A communication channel is used to establish a communication conduit between your calling client code and the object on the server. The .NET Frame work provides three types of channels: HTTP, TCP, and IPC. Before a remote object can be accessed, it must be activated. The .NET Frame work provides two types of activation: server activation and client activation. Server-activated objects can be configured to be Singleton or SingleCall.
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Creating a Remoting Client Application
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Lesson Review
You can use the following questions to test your knowledge of the information in Les son 1, Creating a Client Application to Access a Remote Object. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. Which channel offers the best performance if the remote object and the client reside on the same computer (Select the best answer.) A. The IPC channel B. The HTTP channel C. The TCP channel D. The FTP channel 2. What methods does the .NET Framework provide for activating remote objects (Select all that apply.) A. Server-activated Singleton B. Client-activated C. Server-on-demand activation D. Server-activated SingleCall 3. How do marshal-by-value objects compare to marshal-by-reference objects (Select all that apply.) A. Marshal-by-value objects maintain state between client calls. B. A proxy object is created for marshal-by-value objects. C. Marshal-by-reference objects can directly access resources on the server. D. A proxy object is created for marshal-by-reference objects. E. Marshal-by-value objects can directly access resources on the server.
Lesson 2: How to Configure a Client Application Using a Configuration File
Lesson 2: How to Configure a Client Application Using a Configuration File
In Lesson 1, we focused on how to programmatically configure a client application to be able to access a remote object. Programmatically configuring a client application is perfectly viable, but client applications can also be configured using .NET Framework configuration files. To add a configuration file to a project using Visual Studio, rightclick the project in Solution Explorer and click Add, New Item, Application Configu ration File. By default, if your application is an ASP.NET application, the configuration file is named Web.config; in all other application types, the configuration file is named App.config.
After this lesson, you will be able to:
Create and configure an application to serve as a client that consumes services of a remote object by using an application configuration file. Identify and configure communication channels and the benefits inherent in each type of channel.
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