How to retrieve from or save data in SharePoint Lib programatically?

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C#

SharePoint2010

Hi,

I am using SharePoint 2010. In SharePoint site there is a Form Library which has column "Current Date". I want to create a timer job which will update this column with current system date once in a day.
I know this is possible with SharePoint list with following code:
================================================================

SPList shippingList = oSPWeb.Lists["Candidate Info"];
    SPQuery listQuery = new SPQuery();
    listQuery.Query = "<where><isnotnull><fieldref name="Title" /></isnotnull></where>";

    SPListItemCollection Items = shippingList.GetItems(listQuery);

    if (Items.Count > 0)
    {
        foreach (SPListItem item in Items)
        {
            SPListItem itemToUpdate = shippingList.GetItemById(item.ID);

            itemToUpdate["Current Date"] = DateTime.Now;
            itemToUpdate.Update();
         }
     }

================================================================
But this code is not working with me for SP Form Library. Is anything missing in above code, or is any other way to achieve the above requirement.

Thanks,
Prasanna