Chad and Bonnie,
The following code in the in the delete button click throws an exception (ArgumentOutOfRangeException) , where the try catch block is, if the last item in the listbox is deleted

  this.oIndividualDelayCollection.Remove(this.oIndividualDelayCollection[this.lstIndividualDelay.SelectedIndex]);

this.lstIndividualDelay.DataSource = null;
this.lstIndividualDelay.DataSource = this.oIndividualDelayCollection;

try
{
  this.lstIndividualDelay.SelectedIndex = 0;
}
catch (Exception ex)
{
  MessageBox.Show(ex.ToString(), "In hereeeeeeee");
}

And also throws an ArgumentOutOfRangeException exception when I try to click on any of the remaining items in the listbox.

Maybe the exception type will give you another clue, but it didn't help me.

Any help is very appreciated.

Thanks,
Einar