Main.Controllers.ManageController.LinkLoginCallback C# (CSharp) Method

        public async Task<ActionResult> LinkLoginCallback()
        {
            var loginInfo = await AuthenticationManager.GetExternalLoginInfoAsync(XsrfKey, User.Identity.GetUserId());
            if (loginInfo == null)
            {
                return RedirectToAction("ManageLogins", new { Message = ManageMessageId.Error });
            }
            var result = await UserManager.AddLoginAsync(User.Identity.GetUserId(), loginInfo.Login);
            return result.Succeeded ? RedirectToAction("ManageLogins") : RedirectToAction("ManageLogins", new { Message = ManageMessageId.Error });
        }

 public void testLinkLoginCallback()
 {
     ManageController manageController = new ManageController();
     var linkLoginCallback = manageController.LinkLoginCallback();
 }