i have the following Code:

```
if (v != null && DateTime.Now > v.Besetzt_Von)
{

    Debug.WriteLine("Hallo, das ist die Ausgabe! : " + v.Thema + v.Besetzt_Von + v.Besetzt_Bis);
    string clientId = GetClientId(req);

    DateTime TimeCheck = v.Besetzt_Von;

    if (TimeCheck.AddMinutes(30) > v.Besetzt_Von)
    {
        String hql = "UPDATE Buchung as b " +
        "set STORNO = :Storno " +
        "where ID IN (SELECT rr.Buchung FROM Raumreservierung rr " +
        "where BESETZT_VON = :Von and Raum IN (SELECT r.ID FROM Raum r " +
        "join r.Panel pl where pl.ID = :PanelId))";

        IQuery query = CurrentSession.CreateQuery(hql);
        query.SetParameter("Storno", DateTime.Now);
        query.SetParameter("Von", v.Besetzt_Von);
        query.SetParameter("PanelId", clientId);
        int result = query.ExecuteUpdate();
        Debug.WriteLine("Rows affected: " + result);
    }
}             

```

I want that if for example Besetzt\_Von = 14:00 o'clock, the Query only gets executed if 30 minutes have passed (14:30). I did that with the if clause, but it does not work. The Query is always executing. What iam doing wrong?