c# validate ean 13 Implement Security in a Serviced Component in Visual C#.NET

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Implement Security in a Serviced Component
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The following is a little more advanced than the previous test and tests your overview on security.
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Practice 1
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Create a class that inherits from ServicedComponent. Create a method that adds orders to a database. Create a check to see that only users that are in the manager role can add orders for more than $2,000. Add yourself to the man ager role using the Component Services management console.
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Using Automatic Transactions
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This practice tests your understanding of automatic transactions and requires a little more time to implement because multiple databases are involved.
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Practice 1
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Create a class library with a serviced component that implements a TransferFunds method. You need to create two databases, each with an account table. An account should have a number of fields, one of which is balance. Your method should accept an amount of money as a parameter and subtract the amount from an account in Database 1 and add it to an account in Database 2. Throw an exception if there are insufficient funds. Hint: Use the AutoComplete attribute on the TransferFunds method. Building on Practice 1, create a Winform application that allows you to select two accounts, one for source and one for destination, and the amount of money that needs to be transfered. Add a reference to the library created ear lier and call the TransferFunds method.
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Practice 2
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12 Review
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Take a Practice Test
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.
MORE INFO
Practice tests
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.
13
Serviced Component Management
Having learned how to create and deploy a serviced component in 12, Cre ating Serviced Components, it is now time for you to take matters a step further. In this chapter we take a look at message queuing and securing messages. Microsoft Mes sage Queuing (MSMQ) enables applications running at different times to communicate across networks and systems that might be temporarily offline. MSMQ provides guar anteed message delivery, efficient routing, security, and priority-based messaging. Message queuing can be used to implement scenarios in which messages are sent asynchronously, but synchronous scenarios are also within the realm of possibility. This chapter assumes the use of the latest version of MSMQ, which is MSMQ 3.0. MSMQ 3.0 is available for Microsoft Windows Server 2003 and Windows XP. If you are running older versions of Windows, note that MSMQ 1.0 is part of the Microsoft Windows NT 4.0 option pack. This version requires Microsoft SQL Server for storing the names of the queues. MSMQ 2.0 is part of Microsoft Windows 2000 and uses Microsoft Active Directory directory service for storing queue names. If Active Directory is unavailable, you can only use message queuing in workgroup mode.
Exam objectives in this chapter:
Create, delete, and set permissions on a message queue.
Create a message queue manually. Create a message queue programmatically. Delete a message queue. Set permissions for a message queue programmatically. Create a message. Post a message. Receive a message synchronously. Decide which formatter to use.
Send messages to a message queue and delete messages from a message queue.
13
Serviced Component Management
Read a message body. Delete queued messages. Peek at messages. Enumerate messages. Receive a message asynchronously. Use BeginReceive/BeginPeek methods. Respond to a ReceiveCompleted or PeekCompleted event. Sign a message. Encrypt a message by using UseEncryption and EncryptionAlgorithm prop erties. Handle acknowledgments. Verify a message source by using a certificate. Decrypt a message. Extract response queue details from a message. Compose and send a response to a response queue. Apply a rule to a message queue.
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