private void dgvBookmarks_RowMoving(object sender, Controls.RowMovingEventArgs e)
{
if (e.Source.Name == "dgvImages")
{
e.Cancel = true;
_bookmarks.Insert(e.Destination, new Bookmark()
{
Target = e.SourceRows[0].Index
});
}
else if (e.Source == dgvBookmarks)
{
_bookmarks.Move(e.SourceRows[0].Index, e.Destination);
}
}