How to relate from a web app to a windows service in asp.net with c#?

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C#2.0

C#

ASP.NET

How to relate from a web app to a windows service in
the same project asp.net with c#? I am using web interface to start a service. I am able to start the service exe but I want it to go to the service project in asp.net via c#. In task manager I can see the service process on starting
I did as follows:
Process p=new Process();

p.StartInfo.FileName = @"D:\C3sps  Project\COMMON\Source\Untested\C3psps\C3PSPS_EOD\bin\Debug\C3PSPS_EOD.exe";
                           p.Start();