[ADVANCED-DOTNET] Serializing a datarow in webservices

[Manoj Aggarwal]

Dear Friends,

I am trying the return a datarow from a webmethod.
I am getting the following error when I try to add the webreference in my
windows forms code:

DSOrders.DTInvoiceSelectByBookingIdRow can not be serialized because it does
not have parameterless constructor.

I am using the following code:
[WebMethod]
public DSOrders.DTInvoiceSelectByBookingIdRow GetInvoiceByBookingId(Int64
BookingId)
    {
        DAInvoiceSelectByBookingId objDa = new DAInvoiceSelectByBookingId();
        DSOrders.DTInvoiceSelectByBookingIdDataTable dtInvoice;
        try
        {
            dtInvoice = objDa.GetInvoiceByBookingId(BookingId);
        }
        catch (Exception ex)
        {
            throw ex;
        }
        if (dtInvoice.Rows.Count == 0)
        {
            throw new Exception("Invalid BookingId");
        }
        DSOrders.DTInvoiceSelectByBookingIdRow dr =
(DSOrders.DTInvoiceSelectByBookingIdRow)dtInvoice.Rows[0];
        return dr;
    }


Tried to google, but of now use.

Thanks,
Manoj

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