Datalistitems gets null

[D_W]

I have a small problem here.

I use a datalist to display products for a webshop. In the datalist
there is a buy button.
Clicking on the buy button executes the procedure to add to the cart
but I can't get the values because the datalists dataitems is all
null.

I use this to get the datalistitem

ImageButton btn = (ImageButton)se nder;
DataListItem dli = (DataListItem)b tn.NamingContai ner;

then I try this to get the data
int productID =
Convert.ToInt32 (((DataRowView) dli.DataItem).R ow.ItemArray[0].ToString());

but the item is null.. any ideas?