private void con_deleteBefore_Click(object sender, EventArgs e)
{
if (_listFramesEdit.Count <= 1) return;
ResetUndoProp();
int removeCount = 0;
for (int i = trackBar.Value - 1; i >= 0; i--)
{
File.Delete(_listFramesEdit[i]);
_listFramesEdit.RemoveAt(i); // I should use removeAt everywhere
_listDelayEdit.RemoveAt(i);
removeCount++;
}
trackBar.Maximum = _listFramesEdit.Count - 1;
trackBar.Value = 0;
pictureBitmap.Image = _listFramesEdit[trackBar.Value].From();
this.Text = Resources.Title_EditorFrame + trackBar.Value + " - " + (_listFramesEdit.Count - 1);
tvFrames.Remove(removeCount);
DelayUpdate();
GC.Collect();
}