private void btnDisCD_Click(object sender, EventArgs e)
        {
            /*Retrieve details of selected CDs.For now, type in details of selected CDs
             * Regardless of method, display the details on choice screen*/

            /*foreach (Object item in chkDisCD.CheckedItems)
             * {
             * MessageBox.Show(item.ToString());
             * }*/



            //Outputs the selected CDs according to the checked CDs
            for (int i = 0; i <= chkDisCD.Items.Count - 1; i++)
            {
                if (chkDisCD.GetItemChecked(i))
                {
                    MessageBox.Show(chkDisCD.Items[i].ToString() + "\nCD ID: " + txtDisCDID.Text + "\nAlbum: " + txtDeregAlbum.Text + "\nArtist: " + txtDeregArtist.Text +
                                    "\nYear Released: " + txtDisYr.Text + "\nArtist Label: " + txtDisArtLabel.Text + "\nCost Price: €" + txtDisCostPrice.Text + "\nQty: " + txtDisQty.Text);
                }
            }


            /*Asks Manager to either discontinue the chosen CDs or to keep them available*/
            DialogResult dr = MessageBox.Show("Are you sure you want to discontinue these CDs? \nCD: " + chkDisCD.GetItemText(chkDisCD.SelectedItems), "Confirm CD Discontinuation", MessageBoxButtons.YesNo, MessageBoxIcon.Question);

            if (dr == DialogResult.Yes)
            {
                availability = 'u';


                CD.disCD(Convert.ToInt32(txtDisCDID.Text));

                MessageBox.Show("These CDs are now discontinued. \nThey are now " + availability, "CD Discontinued", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            loadCDs();
            grpDisCD.Visible = false;
            txtDisCDID.Clear();
            txtDeregAlbum.Clear();
            txtDeregArtist.Clear();
            txtDisYr.Clear();
            txtDisArtLabel.Clear();
            txtDisCostPrice.Clear();
            txtDisQty.Clear();
        }