Shared printers are retrieved only while development, after deployment, only installed printers are retrieved?

Question

I use the following code to retrieve installed and shared printers

    using (ManagementClass printerClass = new ManagementClass("win32_printer"))
    {
        ManagementObjectCollection printers = printerClass.GetInstances();
        foreach (ManagementObject printer in printers)
        {
            ddlPrinters.Items.Add(new ListItem(printer["Name"].ToString(), printer["Name"].ToString()));
        }
    }

While development, everything is ok, but after deployment of website, only installed printers are retrieved?
Any ideas?