Your solution file isn't being displayed in the Visual Studio 2010 Solution Explorer

In it's default state, Visual Studio 2010 isn't configured to display the solution in the Solution Explorer window.  If you wish to change the configuration to always display the solution, you can do so via the following steps:

1. Open Visual Studio 2010
2. Click on Tools -> Options
3. Expand the Project and Solutions node
4. Click on General
5. Place a check in the Always Show Solution checkbox
6. Click OK