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Security=SSPI"; ReportLookUpData lookUp = new ReportLookUpData(); SqlConnection connection = new SqlConnection(myConn); //Data retrieval code.. return lookUp; } } While Steve was creating his data access component, Andrew was working on a data access component for another report Andrew s experience told him that hard-coding the connection string would not be the best choice, so he decided to use the application's configuration file to store the connection string Finally, Sue was working on yet another data access component for the report she was creating, and she decided to store the connection string in the Windows registry From the developers standpoint, the application is ready to be deployed in the production environment, with the connection strings hard-coded, stored in the Windows registry, and stored in the application configuration files A few months pass, and a new developer named Tim joins the company.

Tim is tasked with changing database providers from SQL Server to Oracle Tim immediately sees an issue with Steve s hard-coding of the connection string, so he opts to use a text file to store the connection string for the application Now Tim not only has to modify each data access component but he also must discover how the connection strings were stored and modify all the storage mechanisms in order to change the connection string between the development, integration, and production environments For the very smallest of applications, this may not be a big deal However, for very large applications, where there may be hundreds of data access components that require connection strings, this can become a maintenance nightmare Having a common, consistent way of handling connection strings is most beneficial from both the development and administrative points of view.

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It's important to have a good grasp of how the different threads of an application interact because a lot of troubleshooting has to be done by pure thought. Threading errors are notorious for showing up intermittently and being difficult to consistently reproduce, which makes them difficult to debug. The example game in this chapter illustrates how to get the different threads of a game for running the animation, music, and handling the user s input to work together during standard game play as well as when the game is interrupted.

To accomplish this, an organization might define a coding standard defining how to properly store and retrieve a database connection string However, this technique will end up creating many coding rules that the development team will constantly have to remember and enforce Even with a coding rule like this in place, the application developers would still have to create the code to retrieve the connection string, and this repetitive coding would eventually become mundane and time-consuming A better way to handle these kinds of development issues is through an enterprise framework An enterprise framework builds upon the functionality available within a development environment, but it takes the most common code routines in an application and encapsulates the code into a more simplified implementation Let s reconsider the previous example, this time revising it to use a framework component: public class myLookupDataAccessClass { public ReportLookUpData GetReportLookUpData() {.

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When extending Enterprise Library, especially when creating a new custom application block, it is important to try to follow the guidelines set forth by the Microsoft patterns & practices

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