Please refer to the Introduction to PnP Core Component and OfficeDevPnP.Core for more details. I have created a console application and added SharePointPnPCoreOnline NuGet package for the SharePoint 2016 version.
Code Snippet
  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Net;
  5. using System.Text;
  6. using System.Threading.Tasks;
  7. using Microsoft.SharePoint.Client;
  8. using OfficeDevPnP.Core;
  10. namespace SP2016PnPCoreComponentDemo
  11. {
  12. class Program
  13. {
  14. static void Main(string[] args)
  15. {
  16. // Input Parameters
  17. string siteUrl = "http://c7395723754:35298/sites/VijaiDemo";
  18. string userName = "administrator";
  19. string password = "xxxxxxxx";
  20. string domain = "AD2012";
  21. string fieldName = "PnP Text";
  23. OfficeDevPnP.Core.AuthenticationManager authMgr = new OfficeDevPnP.Core.AuthenticationManager();
  25. try
  26. {
  27. // Get the client context
  28. using (var ctx = authMgr.GetNetworkCredentialAuthenticatedContext(siteUrl, userName, password, domain))
  29. {
  30. // Check if field exists by Name using CSOM Extension Method
  31. if (ctx.Web.FieldExistsByName(fieldName))
  32. {
  33. Console.WriteLine(fieldName + " exists in the site");
  34. Console.ReadLine();
  35. }
  36. }
  37. }
  39. catch (Exception ex)
  40. {
  41. Console.WriteLine("Error Message: " + ex.Message);
  42. }
  43. }
  44. }
  45. }