Hi i am in a serious problem & want to get rid of this prob as soon as possible.
whenever i try to connect to server for establishing database connection i get this message

"Login failed for user "sa" ; Not associated with a trusted SQL Server connection"

I get this with any user i try or even windows authentication mode.as i have two users one is sa & other is my name as username .

This error occurs when i try to open visual studio .Net at objconenction.open()

I also get an error message if i try to run a web application in visual studio .net saying "http://localhost/webapplication3" cannot be opened . HTTP Server Error 500 .

Please help its urgent.