What is Web Config file?

A web configuration file is a special type of file that you can add to your application to configure your application.
Its an XML file (Case senstive).

if you add your Import namespace in
in web config file then their is no need to import that name space in .aspx page.

its automatically inherit that .

*its page property so think about .aspx page .
for example....



and the Default namespaces are listed under following path:
\windows\microsoft.net\framework\[Ver]\config\web.config