Crystal Report Error in Linq To Sql in windows apps.

hey i m generating a crystal report in vs 2010 using linq to sql in desktop apps.

But i m getting this error at the click event of the print button.

Error: DataSet does not support System.Nullable<>

my store procedure:

alter proc wholesale_print

(

@invoice_no varchar(15),

@cust_id int

)

begin

select cust.customer_name,item.item_name,inv.invoice_no,inv.Qty,inv.price,

inv.item_amount,inv.disc,inv.disc_amt,inv.vat,inv.vat_amt,inv.total_amt

from inv_invoice_detail as inv

inner join Inv_Customer_Name as cust

on inv.cust_id=cust.customer_id

inner join Inv_item_master as item

on inv.item_id=item.item_id

where inv.invoice_no=@invoice_no

and inv.cust_id=@cust_id

end

code which i wrote at the click event of print button

Inventory_dataDataContext linq = new Inventory_dataDataContext();

var abc = linq.wholesale_print(txt_invoice.text,Convert.ToInt32(cmb_cust.selectedvalue);

rpt.SetDataSource(abc);

crystalReportViewer1.ReportSource = rpt;

crystalReportViewer1.Refresh();*/

private void Form2_Load(object sender, EventArgs e) { RST_DBDataContext db = new RST_DBDataContext(); var d = (from s in db.TblSpareParts select new { s.SPartName?? DBNull.Value, s.SPartCode?? DBNull.Value, s.ModelID ?? DBNull.Value, s.SPartLocation ?? DBNull.Value, s.SPartActive ?? DBNull.Value, s.SPartSalePrice ?? DBNull.Value, }).ToArray(); CrystalReport1 c = new CrystalReport1(); c.SetDataSource(d); crystalReportViewer1.ReportSource = c; }