DataList Datasource

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ASP.NET

LINQ

Hi i have a DataList in my usercontrol, this DataList in different situation have some datasource (some storedprocedure), now in DataList_ItemDataBound event, i want find the productid return (productid is a filed in my database table, this filed return with all my storedprocedure), i khow, i must use e.Item.DataItem, but i don't know how i must use it.
i think i should cast it to a data type, but i don't know which data type
(i use LINQ technology)
i call storedprocedure like this:

var q = db.CatalogGetProductsOnDeptPromo(Int32.Parse(departmentId),
BalloonShopConfiguration.ProductDescriptionLength, 
Int32.Parse(page),
    BalloonShopConfiguration.ProductsPerPage, ref howManyPages);
            DataList.DataSource = q;
            DataList.DataBind();

CatalogGetProductsOnDeptPromo is my storedprocedure
please help me,
regard iman