LeafWeb/WebCms/Controllers/MembershipController.cs

using System.Web.Mvc;
using Umbraco.Core;

namespace LeafWeb.WebCms.Controllers
{
    public class MembershipController : BaseController
    {
        public ActionResult Verify(string email, string token)
        {
            var redirectUrl = "/";

            var memberService = ApplicationContext.Current.Services.MemberService;
            var member = memberService.GetByEmail(email);
            if (member == null)
            {
                TempData["StatusMessage"] = $"Sorry, user with email {email} not found. Please try to register again, or use Contact Us to resolve the issue.";
                TempData["StatusMessage-Type"] = "alert-danger";
            }
            else if (member.IsApproved)
            {
                TempData["StatusMessage"] = "You've already been verified, " + member.Name;
                TempData["StatusMessage-Type"] = "alert-info";  
            }
            else
            {
                var storedToken = member.GetValue("VerificationToken") as string;

                if (string.IsNullOrEmpty(storedToken))
                {
                    TempData["StatusMessage"] = $"No verification token exists for this user.";
                    TempData["StatusMessage-Type"] = "alert-danger";
                }
                else if (storedToken != token)
                {
                    TempData["StatusMessage"] = $"Sorry, your token cannot be found. Please try to register again, or use Contact Us to resolve the issue.";
                    TempData["StatusMessage-Type"] = "alert-danger";
                }
                else
                {
                    // member is now verified
                    member.IsApproved = true;

                    // remove the verification
                    member.SetValue("VerificationToken", string.Empty);
                    memberService.Save(member);

                    TempData["StatusMessage"] = "Thank you! Your email is now verified at " + member.Email;
                    TempData["StatusMessage-Type"] = "alert-success";

                    // TODO: change redirectUrl to their own page
                }
            }
            
            return Redirect(redirectUrl);
        }
    }
}