private void Form_SellProducts_Load(object sender, EventArgs e)
{
txtusers.Text = LoginController.employeelogined.Rows[0]["EmployeeName"].ToString();
txtuseauther.Text = LoginController.userlogined.Rows[0]["UserAuther"].ToString();
txtBillno.Text = cntrl_sell.SellBill().ToString();
timer1.Start();
txtDate.Text = DateTime.Now.ToString("yyyy/MM/dd");
cbRoom.DataSource = cntrl_sell.get_roomComb();
cbRoom.DisplayMember = "RoomNo";
cbRoom.ValueMember = "RoomID";
cbRoom.Text = ".......ເລືອກຫ້ອງ......";
dgvRoomCheck.DataSource = new DataTable();
dgvRoomCheck.Visible = false;
cbProductType.DataSource = cntrl_sell.getProductType();
cbProductType.DisplayMember = "ProductTypeName";
cbProductType.ValueMember = "ProductTypeID";
cbProductType.Text = ".......ເລືອກປະເພດສິນຄ້່າ......";
dgvProStock.DataSource = new DataTable();
rdb_SaleRoom.Checked = false;
rdbSaleOther.Checked = false;
}