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What is the use of web.config file?

Web.config file is the main settings and configuration file for an asp.net web application. the file is an xml document that defines configuration settings and information regarding the web application. It can be considered as one of the most essential part of a web application.

web.config used
1.       Database connection string
2.       Session state configuration
3.       Application language and compilation settings
4.       Security configuration
5.       Contains information that control module loading
6.       Tracing
7.       Error Handling
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