title: "Operation not implemented yet" Error
body: <p>I have an asp.net web application. When I try to export a report via crystal report I get following error :</p>
  
  <p><code>Error in File C:\DOCUME~1\User\LOCALS~1\Temp\MainReport {7F8A9E9E-DD47-4D17-A44D-68D9478A792C}.rpt: Operation not yet implemented.</code></p>
  
  <p>I use this code to export report :</p>
  
  <pre><code>    ReportDocument reportDocument = reportSource.ReportDocument;
      reportDocument.SetDataSource(dt);
      Response.ClearContent();
      Response.ClearHeaders(); 
      reportDocument.ExportToHttpResponse(ExportFormatType.PortableDocFormat, Response, false, "Report");
  </code></pre>
  
  <p>Thanks in advance.</p>