what is web.config file.how many web.config files can be allowed to use in an application
what exactly is the usage of web.config file

Web.config is a configuration file for an ASP.NET Web application. Windows applications use a similar file called Application.Config.

The purpose of these configuration files is to set global settings like debugging information, authorization, etc. You can also define global values that can be accessed from .NET using the syntax:

<add key="name" value="John"/>

You could place a database connection string here. Although there are security implications.

For more help, www.NeedProgrammingHelp.com

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