how to generate barcode in c# Practice 2 in C#.NET

Generator QR in C#.NET Practice 2

Show the size of the ThreadPool by calling the ThreadPool.GetMinThreads and ThreadPool.GetMaxThreads methods. Change the number of the ThreadPool s threads by increasing and decreasing the threads using the ThreadPool.SetMinThreads and ThreadPool.SetMaxThreads methods. Run the application with different settings to see how the thread pool operates differently.

Take the application to different CPU configurations (single CPU, HyperThreaded CPU, and multiple CPUs), and see how the thread pool operates differently and how the minimum and maximum number of threads is different on different CPU platforms.

The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-536 certification exam content. You can set up the test so that it closely simulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.

For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.

8

This chapter covers two distinct topics: application domains and services. Application domains enable you to call external assemblies with the optimal efficiency and security. Services are a special type of assembly that runs in the background, presents no user interface, and is controlled by using special tools. This chapter discusses how to create and configure application domains, and how to develop and install services.

Exam objectives in this chapter:

Create a unit of isolation for common language runtime in a .NET Framework application by using application domains. (Refer System namespace.)

Create an application domain. Unload an application domain. Configure an application domain. Retrieve setup information from an application domain. Load assemblies into an application domain.

Implement, install, and control a service. (Refer System.ServiceProcess namespace.)

Inherit from ServiceBase class ServiceController class and ServiceControllerPermission class ServiceInstaller and ServiceProcessInstaller class SessionChangeDescription structure and SessionChangeReason enumeration

Lessons in this chapter:

Lesson 1: Creating Application Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437 Lesson 2: Configuring Application Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . 448 Lesson 3: Creating Windows Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 457

8

To complete the lessons in this chapter, you should be familiar with Microsoft Visual Basic or C# and be comfortable with the following tasks:

Create a console application in Microsoft Visual Studio using Visual Basic or C#. Add references to system class libraries to a project. Create text files. Add events to the event log.

Developers often need to run an external assembly. However, running an external assembly can lead to inefficient resource usage and security vulnerabilities. The best way to manage these risks is to create an application domain and call the assembly from within the protected environment.

After this lesson, you will be able to:

Describe the purpose of an application domain. Write code that makes use of the AppDomain class. Create an application domain. Launch an assembly within an application domain. Unload the application domain.

An application domain is a logical container that allows multiple assemblies to run within a single process but prevents them from directly accessing other assemblies memories. Application domains offer many of the features of a process, such as separate memory spaces and access to resources. However, application domains are more efficient than processes, enabling multiple assemblies to be run in separate application domains without the overhead of launching separate processes. Figure 8-1 shows how a single process can contain multiple application domains.