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private string GetLDAPConnection(string domainController, string domainUserName, string password)
{
    string ldapConn = string.Format("LDAP://{0}/rootDSE", domainController);
    DirectoryEntry root = new DirectoryEntry(ldapConn, domainUserName, password);
    string serverName = root.Properties["defaultNamingContext"].Value.ToString();
    return string.Format("LDAP://{0}/{1}", domainController, serverName);
}

 public void ConnectToDomain(string domainController, string domainUserName, string password)
{
    ctx = new PrincipalContext(ContextType.Domain, domainController);
    
    try
    {
        if (ctx.ValidateCredentials(domainUserName, password))
        {
            string ldapConn = GetLDAPConnection(domainController, domainUserName, password);
            dirEntry = new DirectoryEntry(ldapConn, domainUserName, password);

            MainWindow.logToWindow("Zalogowano " + domainUserName + " do " + domainController);

        }
        else
        {
            MainWindow.logToWindow("Niezalogowano " + domainUserName + " do " + domainController + "\n Sprawdź login i hasło");
        }

    }
    catch (Exception ex)
    {

        MainWindow.logToWindow(ex.ToString());
    }

}