CheckListBox的使用(代码)

private void LeaveHolidaySet_Load(object sender, System.EventArgs e)
        ...{
            SqlDataReader dr;
            dr = ConnectServer.GetReaderHoliday();
            if(dr!=null)
            ...{
                while(dr.Read())
                ...{
                    clList.Items.Add(dr["HolidayDate"]+"-"+dr["HolidayName"]);
                }
            }
            
        }

        private void btnDel_Click(object sender, System.EventArgs e)
        ...{
            string sql="delete from tblHoliday where";
            foreach (string item in this.clList.CheckedItems)
            ...{
                item.
                message+=item.ToString();
            }
            

            MessageBox.Show(message);
        }