System.LINQ name sapce not found

One day while working with LINQ,
After creation of the application, while debugging
It said that the System.LINQ name space is not found....

How Do I Enable Line Numbering In VS 2008

One day after installing VS IDE, i got a silly problem,
I am unable to see the line numberings in the IDE.

Got the solution finally as
Go to-->Tools-->Options-->TextEditor-->All Languages

TimeOut Problem In WCF or Web Service

When I am learning WCF services the first problem I faced is with the TIMEOUT.
I done everything correctly but the service is not running.
I googled about the problem.
Long looong posts about this problem.
Completely confused, hated WCF.
But,