Bug with listview using custom ListViewSorter

[sorpor]

I am trying to create a custom listviewsorter by implementing IComparer. My
listview has check boxes and the purpose is to move checked item to top of
list. They all will be sorted ascendingly. It throws error "-1 is not a
valid index" when the sorting is done with listview. I have no problem using
the same custom sorter for an arraylist of listviewitems. A bug in listview
control? Any suggestion?

Thanks,
-sorpor

Here is the code for the comparer:

internal class listviewsorter: IComparer

{

#region IComparer Members

public int Compare(object x, object y)

{

int result = 0;

ListViewItem itmX = (ListViewItem)x ;

ListViewItem itmY = (ListViewItem)y ;
if (itmX.Checked == itmY.Checked)

result = String.Compare( itmX.Text, itmY.Text);

else

{

System.Diagnost ics.Trace.Write Line("Bool");

result = itmY.Checked.Co mpareTo(itmX.Ch ecked); //checked < not checked

}

return result;

}

#endregion

}

Works fine with ArrayList sorting:

ArrayList testItms = new ArrayList();

ListViewItem a = new ListViewItem("A ");

ListViewItem b = new ListViewItem("B ");

ListViewItem c = new ListViewItem("C ");

c.Checked = true;

testItms.Add(b) ;

testItms.Add(a) ;

testItms.Add(c) ;

foreach(ListVie wItem itm in testItms) //b a c

{

System.Diagnost ics.Trace.Write Line(itm.Text);

}

testItms.Sort(n ew listviewsorter( ));

foreach(ListVie wItem itm in testItms) //c a b

{

System.Diagnost ics.Trace.Write Line(itm.Text);

}