private void ClearControls()
{
_billData = new BillData();
_inventoryData = new InventoryData();
_client = null;
_billDetail = new List<BillDetailModel>();
_bill = new BillModel();
_billTaxes = new List<BillTaxesModel>();
_billSaveModel = new BillSaveModel();
_bill = new BillModel
{
Id = Guid.NewGuid(),
BillNumber = _billData.GetBillNumber(),
DateEvent = DateTime.Now
};
lblNumeroFactura.Text = _bill.BillNumber.ToString().PadLeft(8, '0');
_billTaxes = _billData.GetBillTaxes();
_billTaxes.ForEach(x => x.IdBill = _bill.Id);
dtgImpuestos.DataSource = _billTaxes;
lblGranTotal.Text = "$0,00";
txtSubTotal.Text = string.Format("{0:0.00}", 0.00);
txtDescuentoFinal.Text = string.Format("{0:0.00}", 0.00);
txtDescuentoCliente.Text = string.Format("{0:0.00}", 0.00);
dtgDetalleFactura.DataSource = new List<BillDetailModel>();
txtIdentificacionCliente.Text = string.Empty;
txtNombreCliente.Text = string.Empty;
txtDireccion.Text = string.Empty;
txtTelefono.Text = string.Empty;
txtEmail.Text = string.Empty;
txtCodigoBarras.Text = string.Empty;
txtNombreProducto.Text = string.Empty;
lstProducto.DataSource = new List<InventoryModel>();
btnBuscarProducto.Enabled = false;
btnFacturar.Enabled = false;
}