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Being a good citizen is especially important on the phone because there is no limit to the amount of data that an application can store (there are no per-application storage quotas) This means that your applications must minimize their use of storage without causing a reduction in performance of the device and your application The following are some recommendations for using storage on the device: Use the DeviceExtendedProperties class to see how much memory your application is using, and how much memory is installed and available For more information about the Device ExtendedProperties class, see Appendix C, Leveraging Device Capabilities Make sure that your application cleans up and releases storage when it is no longer required, especially when the application is tombstoned or terminated.

To enable administrators to use hashed password information in the Web.config file, your ASP.NET application must include a page or tool to generate these passwords. The passwords are stored in hexadecimal format and hashed with the specified hash ing protocol. You can use the System.Security.Cryptography namespace to generate such a hash. The following console application demonstrates this by accepting a

password as a command-line parameter and displaying the hash of the password. The resulting hash can be pasted directly into the Web.config file.

'VB Imports System.Security.Cryptography Imports System.Text Module Module1 Sub Main(ByVal args As String())

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Consider using caching to improve application performance, but only cache data that is regularly required and that does not affect the availability of isolated storage for other applications and services Consider compressing data that is placed in storage, though keep in mind that this will require additional processing and reduce battery life You may be able to use data formats that are more compact; for example you might store configuration information or other types of data in binary or JSON format instead of XML format Ensure that sensitive data is encrypted, especially when it might be stored in removable media, such as a flash card Note: Typically, you will see the following effects, depending on the serialization method you choose:.

Dim password As Byte() = Encoding.ASCII.GetBytes(args(0))

myHash.ComputeHash(password)

Console.Write(thisByte.ToString("X2"))

Using serializable collections is a good way to store data in isolated storage on Windows Phone 7 devices.

Console.WriteLine()

End Sub End Module //C# using System; using System.Security.Cryptography; using System.Text; namespace HashExample { class Program { static void Main(string[] args) { SHA1CryptoServiceProvider myHash=new SHA1CryptoServiceProvider(); byte[] password = Encoding.ASCII.GetBytes(args[0]);

c. Windows Marketplace account management. d. Application submission service for your applications. 3. Which of the following are not requirements for obtaining certification for an application a. Applications must be free from viruses and malicious software. b. Applications must be reliable. c. Applications must allow users to select music files on their phone. d. Applications must minimize use of resources. 4. Which of the following programming techniques are permitted in an application a. The application can terminate if the phone does not have extended memory installed. b. The code can use PInvoke or COM interop to execute native code. c. The application can use code that is not type safe if this is absolutely necessary. d. The application can use reflection to discover and invoke types that require security permissions. 5. For which of the following functions must the application prompt the user to obtain consent before using that feature a. The location service. b. Notifications. c. Person-to-person communication, such as chat features. d. Downloading additional content or data. 6. Which of the following tasks are executed during the application submission process a. Unpacking and validating the content of the XAP file. b. Recreating the permissions demands in the manifest file. c. Removing any content that does not conform to content-restriction policies. d. Adding a Digital Rights Management (DRM) header.

myHash.ComputeHash(password);

foreach (byte thisByte in myHash.Hash) Console.Write(thisByte.ToString("X2")); Console.WriteLine(); } } }

Alternatively, you can call the FormsAuthentication.HashPasswordForStoringInConfigFile method to generate a password hash. This method is described in the next section.

This appendix describes the development and testing environment, tools, and techniques for building Windows Phone 7 applications. It covers the following topics: Setting up a development environment for Windows Phone 7 Using a hardware device during development Developing Windows Phone 7 applications Debugging Windows Phone 7 applications Unit testing Windows Phone 7 applications Additional tools and frameworks

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