I have this code in a C# script Workflow: 

I get the Id from a entry that Import Agent impor to our repository.

int.TryParse(this.GetTokenValue("Entry ID").ToString(), out id);

        public void ExportEntries(int id)
        {
            try
            {
                DocumentInfo docInfo = Document.GetDocumentInfo(id, RASession);
                DocumentExporter docEx = new DocumentExporter();
                docEx.PageFormat = DocumentPageFormat.Tiff;
                docEx.CompressionQuality = 90;

                if(!Directory.Exists(@"E:\PathToExportEntriesTiff\"))
                {
                    Directory.CreateDirectory(@"E:\PathToExportEntriesTiff\");
                }

                docEx.ExportPages(docInfo, docInfo.AllPages, @"E:\PathToExportEntriesTiff\" + docInfo.Name + ".tif");
                docInfo.Dispose();
            }
            catch(Exception ex)
            {
                string filePath = @"E:\PathToExportEntriesTiff\ERROR_TO_EXPORT.txt";

                using (StreamWriter writer = new StreamWriter(filePath, true))
                {
                    writer.WriteLine("Response :" + ex.Message + Environment.NewLine +
                    "" + Environment.NewLine + "Numero Contrato: " + this.GetTokenValue("Entry Name").ToString() +
                    "" + Environment.NewLine + "Path: " + this.GetTokenValue("Entry Path"));
                    writer.WriteLine(Environment.NewLine + "-----------------------------------------------------------------------------" + Environment.NewLine);
                }
            }
        }

And i'm getting this error => The process cannot access the file '**********' because it is being used by another process.

Someone could explain why ?