//
// New bill
private void btNewID_Click(object sender, EventArgs e)
{
string id = MyAction.AutoCreateID(DateTime.Now.ToString("yyyyMMdd") + "/OB");
while (!od.checkID(id))
{
id = MyAction.AutoCreateID(DateTime.Now.ToString("yyyyMMdd") + "/OB");
}
cbBillID.Text = id;
//cbBillID.Properties.Items.Add(id);
txTotal.Text = "0";
txDiscount.Value = 0;
DateOrder.DateTime = DateTime.Now;
btPrint.Enabled = true;
}