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What is the appSettings Section in the web.config file?

The web.config file sets the configuration for a Web project. The appSettings block in configuration file sets the user-defined values for the whole application.
  For example, in the following code snippet, the specified ConnectionString section is used throughout the project for database connection:
  <add key="ConnectionString" value="server=indiabixserver; pwd=dbpassword; database=indiabix" />