SharePoint - Enable session state

Hi,

i dont know how to enable session state, i found some articles in google, and there was written that it can be doe in webconfig file, but im developing a visual web part in sharepoint 2010 and i dont know how to find the webconfig file
any help?

thnx

Reference from-
http://msdn.microsoft.com/en-us/library/dd587352%28v=office.11%29.aspx

In a Microsoft® Windows® SharePoint™ Services deployment, web.config files are contained in the following folders within the file system:

• Local_Drive:\Inetpub\wwwroot — The web.config file of the top-level content root folder that defines configuration settings for the virtual server of the default Web site in the Windows SharePoint Services deployment. In addition, the content root folder includes a \wpresources folder that contains a web.config file used in Web Part resources.
• Local_Drive:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\wpresources — A web.config file that is used in Web Part resources for the Global Assembly Cache (GAC).
• Local_Drive:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\60\CONFIG — The web.config file and other .config files that together define configuration settings for extending other virtual servers.
• Local_Drive:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\60\ISAPI — The web.config file that defines configuration settings for the /_vti_bin virtual directory.
• Local_Drive:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\60\TEMPLATE\LAYOUTS — The web.config file that defines configuration settings for the /_layouts virtual directory.
• Local_Drive:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\60\TEMPLATE\ADMIN\Locale_ID — The web.config file that defines configuration settings for pages used in SharePoint Central Administration.

hi,,

Enable or disable session state across the entire farm