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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
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12 Which of the following object types allow you to view read-only, forward-only data A DataAdapter B DataSet C DataReader D DataCommand 13 Which of the following statements is correct A The DataSource property refers to the dataset object, and the DisplayMember refers to the field B The DataMember property refers to the dataset object, and the DataSource refers to the field C The DataMember property refers to the field, and the DataSource refers to the dataset object D The DisplayMember property refers to the dataset object, and the DataSource refers to the field 14 Why does the data not display using the following code
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studentConnectionOpen(); studentCommand = studentConnectionCreateCommand(); studentCommandCommandType = CommandTypeText; studentCommandCommandText = "SELECT * FROM Student"; studentAdapter = new SqlDataAdapter (studentCommand); studentSet = new DataSet(); thistxtFirstNameDataBindingsAdd ("Text", studentSet, "FirstName");
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A The command object is instantiated incorrectly B The dataset object is instantiated incorrectly C The data binding is done incorrectly D The dataset has not been populated 15 What have you forgotten to do if you see the following dialog box when running your program
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20: Data in Windows Forms
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A Provide the correct database credentials B Handle data exceptions C Populate the dataset D Read 20
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Test Answers
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1 C 2 C 3 D 4 B 5 A 6 A 7 D 8 E 9 B The command type is Text not StoredProcedure 10 B The exception is caused by the column named Name 11 F 12 C 13 A 14 D 15 B (Well, it could be D!!) PART III
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CHAPTER
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Web Services and COM
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In this chapter, you will Learn how to consume (instantiate and invoke) a web service Be able to instantiate and invoke a COM or COM+ component Understand how to call native functions using platform invoke
Those of you who have done enterprise programming, whereby you create remote objects and invoke their methods from another remote object, will find this chapter exciting Those of you who have never done any remote-method invocations will also find this chapter exciting The ability to build objects on a server and invoke their methods from a client is the true nature of enterprise programming Remember that a server can be an application running on any machine that provides services to a client, which is simply an application that requests services of the server Whether you call it DCOM (Distributed Component Object Model), RMI (Remote Method Invocation), EJB (Enterprise JavaBeans), or CORBA (Common Object Request Broker Architecture), it all has the same objective You want to instantiate an object that resides elsewhere on a network Once that object is created, you want to send it messages and ask it to invoke its methods and return the results to you In the world of Microsoft Visual C# NET and the NET Framework, we call this Web Services In this chapter, we will explore Web Services from the client side (accessing them from our Windows application) The subject of creating Web Services is the topic of Part V of this book and the 70-320 examination, and you will need to understand how to instantiate and invoke a web service We will also examine connecting to legacy services such as COM and COM+ in this chapter
Web Services
When we discuss Web Services, we have to think in terms of objects outside our local computer Think of a program that returns the number of students enrolled in a particular college program How many of our Windows programs (that make up our college applications) could take advantage of a routine like that Probably most of the administrative-type programs could use it at one time or another In that case, it s foolish to think that we would install the service into each and every assembly Code reusability sometimes implies that the code resides on a server machine somewhere in the world in
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