The Expression Tree Visualizer can be used in a debug environment to visualize expressions. To use the visualizer the dll generated by the ExpressionTreeVisualizer project must be copied to ...\Documents\Visual Studio 2008\Visualizers. You may need to create the Visualizers directory. In pre-Vista versions of Windows use the My Documents directory rather than Documents. If you have the rights, you can also copy the file to: ...\Program Files\Microsoft Visual Studio 9.0\Common7\Packages\Debugger\Visualizers.
This console program provides the ability to host the visualizer outside of Visual Studio without need to copy the DLL.
The visualizer window sometimes gets hidden if you run this program in console mode. Try using the GuiHost instead of the ExpressionTreeVisualizerApplication.
For more information, see "How to: Build an Expression Tree" in the documentation.
Many of the LINQ samples require XML files and/or the version of the Northwind sample database that is located in the Data sample. If you install the Data sample under the same parent folder as the other LINQ samples, then the path for the XML files and database file will be resolved automatically. Many of the sample files also require the ObjectDumper project.