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Answer the following questions for your manager: 1. How can we keep the application from hanging up 2. How can the application be developed so that noncritical methods never throw exceptions

was working with a small group within a major university that offered technical classes to faculty, staff, and sometimes students of the university. They purchased a

To successfully master the objectives covered in this chapter, complete the following tasks. You should complete at least Practices 1 and 2. You can complete Practice 3 for a more in-depth understanding of interoperation.

public void SetProgress(int val)

Create a Web service project and add a console application project. In the console application, add a Web reference to the Web service and examine the contents of the proxy class. Use the console application created in Practice 1 and call a Web method in a regular fashion. Then, invoke the same method asynchronously. Add the OneWay attribute to one of the Web methods in the Web ser vice you created in Practice 1. Modify the method so that it intentionally throws an exception. Call the Web method from the console application and ensure that no exception is thrown back to the client.

database application to manage their class schedule, including student enrollments,

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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 70-529 certification exam content. You can set up the test so that it closely sim ulates 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 section titled How to Use the Prac tice Tests in this book s Introduction.

instructors, classrooms, and resources. The database created by the application was fully normalized and was locked so that modifications to the schema could not be made. The training coordinator wanted to write a query that would return the course number, course title, classroom assigned, instructor assigned, and the number of seats still available. To accomplish this, she needed to join 11 tables because of the structure of the database. Because she had the permissions required, she developed a Web-based application that included her SELECT statement joining 11 tables. Because of many factors, including limited resources on the server, additional overhead caused by the Web-based application, and locking contention that her query caused, there were many problems with several databases housed on this server while she ran her query. After this situation, she temporarily lost her privileges to write new queries directly against the production server. Luckily, shortly after this time, they upgraded their database to SQL Server 2005 and the company from which they purchased the database added permissions for them to create indexed views, which helped solve the 11-table join problem.

if (ProgressBar1.InvokeRequired) { SetProgressDelegate del = new SetProgressDelegate(SetProgress); this.Invoke(del, new object[]{val}); }

8

The most common type of JOIN operation involving more than two tables is an INNER JOIN. The following sample expands on the INNER JOIN sample from earlier in this lesson and adds an e-mail address from the Person.EmailAddress table:

It s been noted that there are two primary technologies that the .NET Framework pro vides for implementing a communications layer in distributed applications, .NET XML Web Services and .NET Remoting. With respect to the client code, there are many similarities to using either technology because of the nature of the distributed communications. For instance, both typically require an additional machine to host a separate application. Because of latency inherent in network communications, issues regarding responsive user interfaces need to be addressed. And, as with all applica tions, asynchronous invocations may be necessary to enhance usability. This chapter will address remote method invocations and event management in .NET Remoting.

ProgressBar1.Value = val;

Exam objectives in this chapter:

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