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private void clearToolStripMenuItem1_Click(object sender, EventArgs e)
        {         
                while(this.lvPlaylist.SelectedItems.Count>0)
                {
                    this.lvPlaylist.Items.Remove(this.lvPlaylist.SelectedItems[0]);
                }           
        }					

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        private int[] selIndices;

        private void listView1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right && listView1.GetItemAt(e.X, e.Y) == null)
            {
                selIndices = new int[listView1.SelectedIndices.Count];
                listView1.SelectedIndices.CopyTo(selIndices, 0);
            }        
        }

        private void listView1_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right && listView1.GetItemAt(e.X, e.Y) == null)
            {
                foreach (int idx in selIndices)
                    listView1.SelectedIndices.Add(idx);
            }
        }