Cannot access a closed file error on adding a file to a library

Question

I am trying to copy the attachments from a list to a document library. When I try to write into a document library, occasionally I am getting following error "The remote server returned an error: (500) Internal Server Error.  Cannot access
a closed file.  Cannot access a closed file.  "
Any ideas on what is causing the problem. The code is specified below, The error message is specified after the code. Can you please let me know if I am missing anything. I cant find anything wrong in the code or in the library. The code is running as WCF
Service and the call to process this is made from Infopath form.
try
SPSecurity.RunWithElevatedPrivileges(delegate()
string siteURL = "Site URL";
using (SPSite site = new SPSite(siteURL))
SPWeb oWeb = site.OpenWeb();
SPList oList = oWeb.Lists["List Name"];
SPList docDestination = oWeb.Lists["Destination Library on same site"];
SPFolder fldRoot = oWeb.Folders["Destination Library on same site"];
SPFileCollection flColl = null;
SPQuery oQuery = new SPQuery();
oQuery.Query = "<Where><Eq>" + "<FieldRef Name=\"ID\"/><Value Type=\"Number\">" + RequestID + "</Value></Eq></Where>";
SPListItemCollection oItems = oList.GetItems(oQuery);
foreach (SPListItem lstItem in oItems)
if (lstItem["ID"].ToString() == RequestID)
if (lstItem.Attachments != null && lstItem.Attachments.Count > 0)
foreach (String strName in lstItem.Attachments)
flColl = fldRoot.Files;
SPListItem listtem = docDestination.Items.Add();
SPFile FileCopy = lstItem.ParentList.ParentWeb.GetFile(lstItem.Attachments.UrlPrefix + strName);
SPQuery oQueryDest = new SPQuery();
oQueryDest.Query = "<Where><Eq>" + "<FieldRef Name=\"Name\"/><Value Type=\"Text\">" + FileCopy.Name + "</Value></Eq></Where>";
SPListItemCollection collListItems = docDestination.GetItems(oQuery);
string destFile = flColl.Folder.Url + "/" + FileCopy.Name ;
if (collListItems.Count > 0)
String strFileNamePrfix = FileCopy.Name.Substring(0, FileCopy.Name.Length - 3);
strFileNamePrfix = strFileNamePrfix + "_" + collListItems.Count.ToString();
strFileNamePrfix = strFileNamePrfix + FileCopy.Name.Substring(FileCopy.Name.Length - 3,3);
destFile = flColl.Folder.Url + "/" + strFileNamePrfix;
byte[] fileData = FileCopy.OpenBinary();
Trace.WriteLine("Board Services dest file" + destFile + " Count = " + collListItems.Count.ToString());
SPFile flAdded = flColl.Add(destFile, fileData,true);
SPListItem item = flAdded.Item;
flAdded.Item.Update();
catch (Exception ex)
string strLogEntry = ex.Message.ToString() + ex.StackTrace.ToString();
finally
Form submission failed. (User: xxxxx, Form Name: Template, IP: , Request: http://Site Url/Lists/List name/Task/editifs.aspx?List=e6647e38-cb01-46b3-8bee-308357045532&ID=116&Source=http://Site URL/Lists/List Name/AllItems.aspx?View={CB9F3C2B-49DF-4D75-9720-1E7E000FD229}&FilterField1=Status&FilterValue1=Completed&IsDlg=1&Web=706d51c9-e509-40f3-884a-7d40e126ff14,
Form ID: urn:schemas-microsoft-com:office:infopath:list:-AutoGen-2013-12-06T16:11:54:747Z, Type: DataAdapterException, Exception Message: The remote server returned an error: (500) Internal Server Error.  Cannot access a closed file.  Cannot
access a closed file.  
 at System.IO.FileStream.Write(Byte[] array, Int32 offset, Int32 count)    
The remote server returned an error: (500) Internal Server Error.)

Answer 1

Hi Dimitri,
Thank you, I tried increasing the timeout on web.config file of the wCF service and reloaded the config file.
<httpRuntime executionTimeout="90" maxRequestLength="20000" useFullyQualifiedRedirectUrl="false" requestLengthDiskThreshold="8192"/>
As the error
Form submission failed. (User: , Form Name: Template, IP: , Request: http://site /editifs.aspx?List=e6647e38-cb01-46b3-8bee-308357045532&ID=102&Source=http://site List/AllItems.aspx?View={cb9f3c2b-49df-4d75-9720-1e7e000fd229}&SortField=Status&SortDir=Asc&IsDlg=1&Web=706d51c9-e509-40f3-884a-7d40e126ff14#,
Form ID: urn:schemas-microsoft-com:office:infopath:list:-AutoGen-2013-12-06T16:11:54:747Z, Type: DataAdapterException, Exception Message: The remote server returned an error: (500) Internal Server Error.  Cannot access a closed file.  Cannot access
a closed file.  
 at System.IO.FileStream.Write(Byte[] array, Int32 offset, Int32 count)    
is happening at following line
SPFile flAdded = flColl.Add(destFile, fileData,attachmentPropertiesHashTable ,true);
I only modified the timeout on the wcf service.
I dont think I need to change the timeout on the Webapplication which has this site?
Regards
Nate