C# admin rights for a single methods

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C#

Hi everybody,
Is it possible to require administrator rights for one single method?
Something like this:

[RequireAdminRightsForThisMethod()]
private void TheMethod(){
    // Do something
}

I try to use it in this way:

[PrincipalPermission(SecurityAction.Demand, Role = @"BUILTIN\Administrators")]
public void MyMethod()
{
}

but i have any success.
I found it in this article http://www.omegacoder.com/?p=82[^]
Can anybody explain me how i can execute one method (start/stop service) with admin rights.
I want to do something like this:
user push button;
admin right request is occur;
if user allow it method execute.

Thanks, all!