The process cannot access the file 'D:\Inetpub\unsd\mdg\_Export\MDG_Export_20160525_190312855.zip' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
   at System.IO.File.Create(String path)
   at Unsd.Mi.Web.Handlers.ExportHandler.Zip(String zipFileName, String fileName, String content) in d:\Inetpub\unsd\mdg\Handlers\ExportHandler.ashx:line 107
   at Unsd.Mi.Web.Handlers.ExportHandler.WriteOutputFile(String content) in d:\Inetpub\unsd\mdg\Handlers\ExportHandler.ashx:line 138
   at Unsd.Mi.Web.Handlers.ExportHandler.ProcessRequest(HttpContext context) in d:\Inetpub\unsd\mdg\Handlers\ExportHandler.ashx:line 176