Windows Service Controller Exception - Why?

[Tom J]

I have this code:

System.ServiceP rocess.ServiceC ontroller sc = new
System.ServiceP rocess.ServiceC ontroller("MySe rvice");

if(sc.Status == System.ServiceP rocess.ServiceC ontrollerStatus .Stopped)

{

sc.Start();

}

sc.WaitForStatu s(System.Servic eProcess.Servic eControllerStat us.Running,new
TimeSpan(0,0,0, 30,0));

if(sc.Status == System.ServiceP rocess.ServiceC ontrollerStatus .Running)

{

try

{

sc.ExecuteComma nd(1); //exception happens here

}

catch(System.Ex ception ex)

{

sc.Stop();
sc.WaitForStatu s(System.Servic eProcess.Servic eControllerStat us.Stopped);

MessageBox.Show (ex.Message);

Application.Exi t();

}

}

the sc.ExcecuteComm and(1) throws the following exception:

Cannot control MyService service on computer "."

the inner exception is: Access Denied

My question is: Why can I start, stop, etc. MyService but not use the
ExecuteCommand method?

Thanks!

Tom