.NET (Core and Framework)

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using System.Security.Principal;<br />
using System.Threading;<br />
<br />
...<br />
...<br />
...<br />
<br />
WindowsPrincipal winId = (WindowsPrincipal)Thread.CurrentPrincipal;<br />
bool isAdmin = winId.IsInRole(WindowsBuiltInRole.Administrator);<br />
bool isPowerUser = winId.IsInRole(WindowsBuiltInRole.PowerUser);<br />

<br />
...<br />
using System.Management;<br />
using System.Management.Instrumentation;<br />
...<br />
...<br />
public void GetAllStartupAccounts()<br />
{<br />
   ManagementClass serviceClass = new ManagementClass("Win32_Service");<br />
   ManagementObjectCollection services = serviceClass.GetInstances();<br />
   foreach(ManagementObject service in services)<br />
   {<br />
      Console.WriteLine("{0} starts under account: {1}", service["DisplayName"], service["StartName"]);<br />
   }<br />
   <br />
}<br />