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The Machine.Config file, which specifies the settings that are global to a particular machine. This file is located at the following path: \WINNT\Microsoft.NET\Framework\[Framework Version]\CONFIG\machine.config The simplest way to add application-specific settings into an application configuration file is to use an application configuration file. The file is an XML file and contains add elements with key and value attributes. <?xml version="1.0" encoding="utf-8" ?> <configuration> <appSettings> <add key="ApplicationTitle" value="Sample Console Application" /> <addkey="ConnectionString"value="Server=localhost;Database=Northwind;Integrated Security= false;UserId=sa;Password=;" /> </appSettings> </configuration> <authentication> The authentication section controls the type of authentication used within your Web application Windows, Forms or Passport type of authentication can be defined. Eg: <authentication mode="Windows" /> <allow> or <deny> tags can be used with authorization to allow or deny access to your web application to certain users or roles, <authorization> <allow roles="Administrators,Users" /> <deny users="*" /> </authorization>