public void departmentList()
        {
            DatabaseOps databaseOps = new DatabaseOps();
            DataTable   dataTable   = new DataTable();

            dataTable               = databaseOps.DepartmentList();
            comboBox2.DataSource    = dataTable;
            comboBox2.ValueMember   = "ID";
            comboBox2.DisplayMember = "DepartmentName";
        }