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4. Which of the following ways would you consider storing the data used by an application a. Using isolated storage on the phone. b. Using the built-in SQL Server Compact Edition database on the phone. c. Using the file system on the phone. d. Storing it on the server and synchronizing it with the phone. 5. Which of the following techniques should you consider for securing a Windows Phone 7 application a. Never store any data on the phone. b. Encrypt all sensitive data stored on the phone. c. Use HTTPS for all requests containing sensitive data when communicating with the server. d. Perform a security analysis of your design and the code. 6. Which of the following are useful techniques to maximize performance of a Windows Phone 7 application a. Turn off features such as the Location Service if you do not require them, or turn them off as soon as possible after using them. b. Use single-letter names for variables in your code. c. Optimize your code using good coding practice and simplifications where appropriate. d. Make full use of the graphics processing unit (GPU) by avoiding code that cannot run on it.
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This chapter introduces a fictitious company named Tailspin. Tailspin s flagship product is an online service named Surveys that enables other companies or individuals to conduct their own online surveys. Tailspin wants to extend this service to mobile users, enabling subscribers to the Surveys application to publish surveys to people with Windows Phone 7 devices. These people can use the mobile application to capture survey data from the field. As with any company embarking on a new project, there are many issues to consider and challenges to meet, particularly because Tailspin has not used the Windows Phone 7 platform before. The chapters that follow show, step by step, how Tailspin designed and built a survey client application to run on Windows Phone 7 devices.
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Tailspin is a startup ISV company of approximately 20 employees that specializes in developing solutions using Microsoft technologies. The developers at Tailspin are knowledgeable about various Microsoft products and technologies, including .NET Framework, Windows Mobile, Windows Azure technology platform, Silverlight browser plug-in, and Microsoft Visual Studio development system. The Surveys mobile client was the first application that the developers at Tailspin created for the Windows Phone 7 platform. The Surveys mobile client application is the first of several innovative Windows Phone 7 applications that Tailspin wants to take to market. Tailspin hopes the innovative approach to collecting survey data that the mobile client application offers will help it to grow its market share and increase its revenues. Tailspin is an innovative and agile organization; it is well-placed to exploit new technologies, the business opportunities offered by the cloud, and the increasing sophistication of mobile phones. As a startup company, Tailspin is willing to take risks and use new
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technologies when it implements applications. Tailspin s plan is to gain a competitive advantage as an early adopter of new technologies, especially in mobile devices and the cloud. It hopes to rapidly gain some experience, and then quickly expand on what it learns. This strategy can be described as try, fail fast, learn, and then try again. Tailspin has decided to start with the Surveys mobile client application as its first Windows Phone 7 offering. The Surveys application has been a great success for Tailspin, but Tailspin wanted to further improve its market position by extending the application s functionality. Based on feedback from its subscribers, Tailspin identified four key areas where they could enhance the Surveys application: 1. The application should support a wider range of question types and enable respondents to include additional data, such as pictures, audio, and location data, as a part of their survey responses. 2. People should be able to provide survey responses when they are away from their computers. A convenient time to respond to a survey might not be a convenient time to be using a computer, for example during a commute or while waiting in a checkout line. 3. Subscribers wanted to be able to capture a geographical location for the respondents answering a survey. 4. Subscribers wanted to be able to proactively find survey respondents. Instead of waiting for respondents to come to the survey website by following a link on a web page or in an email, subscribers wanted other ways of finding survey respondents. For example, subscribers wanted to be able to use surveyors who can go out and interview people. In the future, Tailspin would like people to be able to launch surveys by photographing a barcode or QRCode on an advertisement or on product packaging. Windows Phone 7 was a new platform for the developers at Tailspin and the unfamiliarity introduced some additional risk to the project. The developers first had to understand the capabilities of the Windows Phone 7 platform to determine how best to architect and design both the mobile client application and the new elements of the application in the cloud. Three key areas of concern for Tailspin in using the new platform were reliability, security, and connectivity. Windows Phone 7 devices may be only intermittently connected to the Internet, so the mobile application had to be capable of reliably storing the collected data until it could be sent to the cloud
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