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By centralizing your connection strings you make it much easier to modify them when your database changes (for example, when you switch from a development environment to a production server).Never store your connection strings directly in Code Behind files or in the markup section of the page.First, look at the markup for the attribute in a different location. NET controls, the order of attributes in the control declaration doesn’t matter.A couple of interesting things are worth examining. You normally only need these if your column or table name contains a special character such as a space or the name matches a reserved word.All by itself, the controls work together closely to retrieve and modify the data in the underlying data source.
You can leave them in, but if you write your own SQL statements you don’t have to include them (although you could if you wanted to).
In case you’re using the full version of IIS, this account is an account named after an in IIS, or a special account called Network Service.
Chapter 19, which deals with deployment, and Appendix B, which explains how to connect to SQL Server, dig deeper into security-related issues.
All you need to do is drag and drop a few controls, set a few properties, and you’re done.
Obviously, these code-free pages have limitations that make them less useful in more advanced scenarios.
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You’ll seriously regret that the day you have to change your connection string and have to wade through all the pages in your site looking for connection strings.