tailieunhanh - Professional ASP.NET 3.5 in C# and Visual Basic Part 37

Professional in C# and Visual Basic Part 37. Building on the revolutionary release, adds several key new developer features including AJAX, LINQ, and a new CSS designer in Visual Web Developer 2008. The dramatic reduction in code that developers realized from the more than 50 new server controls in now allows developers the time to make their applications more interactive with AJAX, to work with data in their preferred language with LINQ, and to build visually attractive and consistent standards-based sites with CSS. . | Chapter 7 Data Binding in SqlCacheDependency property to create SQL dependencies. You can learn more about caching features in Chapter 23. Storing Connection Information In Microsoft introduced the file as a way of storing application configuration data in a readable and portable format. Many people quickly decided that the file was a great place to store things like the database connection information their applications use. It was easy to access from within the application created a single central location for the configuration data and it was a cinch to change just by editing the XML. Although all those advantages were great several drawbacks existed. First none of the information in the file can be strongly typed. It was therefore difficult to find data type problems within the application until a runtime error occurred. It also meant that developers were unable to use the power of IntelliSense to facilitate development. A second problem was that although the file was secured from access by browsers it cannot be served up by Internet Information Server the data within the file was clearly visible to anyone who had file access to the Web server. Microsoft has addressed these shortcomings of the file by adding features specifically designed to make it easier to work with and secure connection string information in the file. Because database connection information is so frequently stored in the file starting with a new configuration section was added in that file. The connectionStrings section is designed specifically for storing the connection string information. If you examine your file you should see at least one connection string already in the connectionStrings section because our example told the Data Connection Wizard to store connections in the file. Listing 7-19 shows how stores a connection string. .