Problem with Add List Item Microsoft Sharepoint List

After adding a new list item with Add List Item activity and then reading the content with item.Fields[1].Value.ToString(), it gives “0” eventhough the List has the correct value on the correct item field (I can see that this is added correctly in Sharepoint). What might be the reason for this? And how to get pass that… I need to check that specific column, that each item has unique value in that field. Since it recognizes all added items as “0” (by that specific field), it keeps adding not unique values…