Pls Help me

I have one invoice form and an Item form.
Item form consisting of a Dataviegridview showing all items.
(itemcode,name)
Invoice form has dataviewgrid of invoice
(itemcode,name,qty,price,total)
when i click items cell in the invoice form dataviewgrid i am calling
the item form.
what i want is when i double click the item form datagridview items it
shud pass itemcode and name to parent form invoice form datagridview
cell from which cell i have called this item form.

Pls help me this is very urgent..

thanks in advance