PnP Core Component - Get Site Collection Administrators in SharePoint 2016

Please refer to the Introduction to PnP Core Component and OfficeDevPnP.Core for more details. I have created a console application and added SharePointPnPCore2016 NuGet package for the SharePoint 2016 version.
 
Code Snippet: 
  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Linq;  
  4. using System.Text;  
  5. using System.Threading.Tasks;  
  6. using Microsoft.SharePoint.Client;  
  7. using OfficeDevPnP.Core;    
  8.   
  9. namespace SP2016PnPCoreComponentDemo  
  10. {  
  11.     class Program  
  12.     {  
  13.         static void Main(string[] args)  
  14.         {  
  15.             // Input Parameters    
  16.             string siteUrl = "http://c7395723754/";  
  17.             string userName = "administrator";  
  18.             string password = "Mf165Nz2WV";  
  19.             string domain = "AD2012";             
  20.   
  21.             OfficeDevPnP.Core.AuthenticationManager authMgr = new OfficeDevPnP.Core.AuthenticationManager();  
  22.   
  23.             try  
  24.             {  
  25.                 // Get the client context    
  26.                 using (var ctx = authMgr.GetNetworkCredentialAuthenticatedContext(siteUrl, userName, password, domain))  
  27.                 {  
  28.                     // Get Administrators  
  29.                     List<OfficeDevPnP.Core.Entities.UserEntity> adminColl = ctx.Web.GetAdministrators();  
  30.                     foreach (OfficeDevPnP.Core.Entities.UserEntity admin in adminColl)  
  31.                     {  
  32.                         Console.WriteLine("Title: " + admin.Title + " ---- LoginName: " + admin.LoginName + " ---- Email: " + admin.Email);  
  33.                     }  
  34.                 }  
  35.             }  
  36.             catch (Exception ex)  
  37.             {  
  38.                 Console.WriteLine("Error Message: " + ex.Message);  
  39.             }  
  40.         }  
  41.     }  
  42. }