How to get the project names through solution explorer click event.

Question

Hi,

        Do some one know how capture solution file name and the children directory names through solution click event in Visual studio 2008, 2010.

           Idea is:- My application is in C# . Net 3.5 with VS2008
       1. I click on solution file and start building my solution.
        2. In mean time I have to invoke an application in prebuild event  then my application should get the path of .SLN file automatically.
       3. Then my application should list all the VCPROJECT in the file and the relevent source and include directory.

        A quick help will be appreciated.