can i call .exe by using windows service? How?

I want to call My Windows application in windows service periodically. if application is not running then only run windows application.

My code is

string _sApplicationPath = "PATH OF EXE"

if (Process.GetProcessesByName("APPLICATIONNAME/PROCESSNAME").Length > 0) { return; }

else

{

Process myProcess = new Process();

myProcess.StartInfo.UseShellExecute = false;

myProcess.StartInfo.FileName = _sApplicationPath;

myProcess.StartInfo.CreateNoWindow = true;

myProcess.Start();

}

it work in windows application but not work in windows Service.

Help.