Hey guys,

I'm writing a filter that will pick out items. I have a list of Objects. The objects contain a number, name and some other irrelevant items. At the moment, the list contains 200 items. When typing in a textbox, i'm looking if the string matches a part of the number/name of the objects in the list. If so, add them to the listbox. Here's the code for my textbox textchanged event :

private void txtTelnumber_TextChanged(object sender, TextChangedEventArgs e)
    {
        lstOverview.Items.Clear();
        string data = "";
        foreach (ucTelListItem telList in _allUsers)
        {
            data = telList.User.H323 + telList.user.E164;
            if (data.Contains(txtTelnumber.Text))
                lstOverview.Items.Add(telList);
        }
    }

I sometimes see a little delay when entering a character, especially when i go from 4 records to 200 records (so when i had a filter and 4 records matched, and i backspace and the whole list appears again). My list is a list of usercontrols, cause i found it takes less time to load the usercontrols from a list, then to have to initialize a new usercontrol each time.

Can i do something about the code, or is it just adding the usercontrol the listbox that causes the small delay (small delay = <1 sec)?

Thanks in advance.