database connectivity in vs 2008

i have already done that with 'O' capital in Off but it is not showing any error on localhost.

but when i upload, it again show customerror.

my website url is :ieguild.in  & it is working on internet but it is static

now when i create solution with BLL, DAL, GUI & then upload it shows error:(custom error)

what's the actual error you get?

now it has shown the error i.e authentication mode=windows.

i have deleted that line from web.config & it is working now

i want to know that was that line authentication mode=windows is necessary or not?

The authentication element in your webconfig enables you to set-up the authentication type to use in your application for user's login. Check these links below for more details:

• http://msdn.microsoft.com/en-us/library/aa291347%28v=vs.71%29.aspx
• http://sandblogaspnet.blogspot.com/2008/09/tags-in-webconfig.html

i don't have iis.does configure this solution as an application in iis solve this problem

You'll have to install IIS to run your webpage. Just search the web for "Installing IIS".