dotNetController

using System;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;
using System.Text.RegularExpressions;

namespace YourApplication.Controllers {
 public class CookiesController: Controller {

  [HttpGet]
  public IActionResult SyncCookies() {
   foreach(string cookieName in Request.Cookies.Keys) {
    string pattern = @ "^(_vis_opt_|_vwo).*";

    Regex regex = new Regex(pattern, RegexOptions.IgnoreCase);
    Match match = regex.Match(cookieName);

    if (match.Success) {
     string cookieValue = Request.Cookies[cookieName];

     CookieOptions option = new CookieOptions();
     // Expire any VWO cookie after 10 years.
     UInt64 expiry = 315360000000 UL;

     option.Expires = DateTime.Now.AddMilliseconds(expiry);
     // Set the cookie on root path so that it's accessible on all paths
     option.Path = "/";

     // Set the domain to .eTld+1 e.g. for a.abc.com eTld would be abc.com. So domain should be .abc.com. If you are not sure about what is the                            value in your case, you can contact the VWO support team.
     option.Domain = ".<eTld+1";

     Response.Cookies.Append(cookieName, cookieValue, option);
    }
   }

   Response.Headers.Add("Access-Control-Allow-Origin", "*");

   return Ok();
  }
 }
}