Get the updated values from the GridViewEventArgs.NewValues property:

protected void GridView1_RowUpdating(object sender, GridViewEditEventArgs e)
 {
productTableAdapter pAdapter = new productTableAdapter();
int id = Convert.ToInt32(e.OldValues["id"]);
string name = e.NewValues["name"].ToString();
string desc = e.NewValues["description"].ToString();

pAdapter.Update(id, name, description);

GridView1.EditIndex = -1;

GridView1.DataBind();
    }