The LINQ to SQL Debug Visualizer isn't built-in to VS 2008 -
instead it is an add-in that you need to download to use. You can
download a copy of it here.
The download contains both a binary .dll assembly version of
the visualizer (within the \bin\debug directory below), as well as all of the
source code for the visualizer:
To install the LINQ to SQL debug visualizer,
follow the below steps:
1) Shutdown all running versions of Visual
2) Copy the SqlServerQueryVisualizer.dll assembly
from the \bin\debug\ directory in the .zip download above into your
local \Program Files\Microsoft Visual Studio
3) Start up Visual Studio 2008 again.
Now when you use the debugger with LINQ to SQL you should be able to hover over
LINQ query expressions and inspect their raw SQL (no extra registration is
Hope this helps,