private void lbList_SelectedIndexChanged(object sender, EventArgs e)
        {
            int index = this.lbList.SelectedIndex;
            if (index == 0)
            {
                this.contextMenuStrip1.Items.Clear();
                ToolStripMenuItem item = new ToolStripMenuItem();
                item.Text = "0000000";
                this.contextMenuStrip1.Items.Add(item);
            }
            else if (index == 1)
            {
                this.contextMenuStrip1.Items.Clear();
                ToolStripMenuItem item = new ToolStripMenuItem();
                item.Text = "1111111";
                this.contextMenuStrip1.Items.Add(item);
            }
            else if (index == 2)
            {
                this.contextMenuStrip1.Items.Clear();
                ToolStripMenuItem item = new ToolStripMenuItem();
                item.Text = "2222222";
                this.contextMenuStrip1.Items.Add(item);
            }
            
        }