qr code generator asp net c# Suggested Practices in C#.NET

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To help you successfully master the Improving the security of .NET Framework applications by using the .NET Framework 2.0 security features exam objective, complete the following tasks.
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Implement a Custom Authentication Scheme by Using the System.Security.Authentication Classes
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To master this objective, you should complete Practices 1 and 2.
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Practice 1 Create a client/server application that establishes an SslStream
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connection between the two hosts.
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Practice 2 Add authentication error handling to the application created in
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Practice 1 by catching multiple types of exceptions based on classes in the System.Security.Authentication namespace.
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Access and Modify Identity Information by Using the System.Security.Principal Classes
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For this task, you should complete at least Practices 1 and 2. If you want a better understanding of how you can implement custom authentication, complete Practice 3. If you have written an application that uses other authentication techniques, complete Practice 4 as well.
Practice 1 List every time you have been authenticated in the past week. Practice 2 Write an application that implements a custom authentication
scheme by implementing the GenericIdentity and GenericPrincipal classes.
Practice 3 Write an application that implements a custom authentication
scheme by implementing the IIdentity and IPrincipal interfaces.
Practice 4 If you have written an application that authenticates users to a data-
base, update the application to make use of the System.Security.Authentication classes.
Implement Access Control by Using the System.Security.AccessControl Classes
For this task, you should complete all three practices to gain a good understanding of how to view and control ACLs.
Practice 1 Write an application that analyzes every folder on your hard drive
and displays folders for which the Everyone group has access.
Practice 2 Write a console application named CopyACLs that functions exactly
like the Copy command-line tool, but copies both files and ACLs.
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Practice 3 Write an application that enables auditing for successfully adding
values to the Run and RunOnce registry keys located in HKEY_LOCAL_ MACHINE\Software\Microsoft\Windows\CurrentVersion\ and HKEY_ CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\.
Encrypt, Decrypt, and Hash Data by Using the System.Security.Cryptography Classes
For this task, you should at least complete Practices 1 and 2 to understand how to use digital signatures and hashing in the real world. Complete Practice 3 to gain a better understanding of how to use asymmetric encryption.
Practice 1 Write an application to sign files and then verify the digital signature. Practice 2 Write an application that stores hashes of every .dll and .exe file on
your computer, and that later analyzes the files for changes and shows you which files have been modified.
Practice 3 Write a client/server application that encrypts files on the client
using a public key provided by the server, transfers them across a network, and then decrypts them on the server using the private key.
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 70-536 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.
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Practice tests
For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.
13
Interoperation
Interoperation is a generic name used to refer to the process of interacting with unmanaged code from within managed code. Although the .NET Framework 2.0 provides a vast amount of functionality, two issues make Interoperation necessary:
Many companies have a large amount of legacy code, code that was expensive to develop and has already been tested. Not every Microsoft Windows API has been wrapped for the .NET Framework 2.0, so some tasks are possible only if you use Interoperation.
For example, an application might need to take control of Microsoft Office Excel and perform a processing routine. Because the Excel library isn t written in .NET, you need to access it through Component Object Model (COM). COM and .NET are two very different execution environments, so the only way to share libraries between them is to use Interoperation, which is also known as Interop.
Exam objectives in this chapter:
Expose COM components to the .NET Framework and the .NET Framework components to COM. (Refer System.Runtime.InteropServices namespace)
Import a type library as an assembly. Create COM types in managed code. Compile an Interop project. Deploy an Interop application. Qualify the .NET Framework types for Interoperation. Apply Interop attributes, such as the ComVisibleAttribute class. Package an assembly for COM. Deploy an application for COM access.
Call unmanaged DLL functions in a .NET Framework application, and control the marshaling of data in a .NET Framework application. (Refer System.Runtime .InteropServices namespace)
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