c# Webbrowser logged in detection problem(login works)

[ihateadmins]

hello, i'm having problem with my webBrowser1 to detect that im logged in, because by the time it's loggin in it already checked the status and is not logged on while logging on, but sleeping or setting up a timer freezes the thread and i couldn't find any working solution for the whole day.
https://github.com/ihateadmins/freenom-dns-updater

Form1.cs
btn_change_Click(): calls login(website);

if (rawHtml.Contains("DNS MANAGEMENT for " + domain) || webBrowser1.Url == new Uri("https://my.freenom.com/clientarea.php?managedns="+ domain +"&domainid=" + domainid) ) is never getting true

any help would be greatly appreciated