private void Products_SelectedIndexChanged(object sender, EventArgs e)
{
Quantity.Text = bc.getQuantity(Int32.Parse(Products.SelectedValue.ToString())).ToString();
total = Int32.Parse(Quantity.Text);
c = total;
if (c == 0)
{
AddToOutvoice.Enabled = false;
}
else
{
AddToOutvoice.Enabled = true;
}
}