getting error on outputstream when trying to access from ionic.zip file?

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ASP.NET

C#3.5

Hii ,

Length = 'Response.OutputStream.Length' threw an exception of type 'System.NotSupportedException'
Position = 'Response.OutputStream.Position' threw an exception of type 'System.NotSupportedException'
ReadTimeout = 'Response.OutputStream.ReadTimeout' threw an exception of type 'System.InvalidOperationException'
WriteTimeout = 'Response.OutputStream.WriteTimeout' threw an exception of type 'System.InvalidOperationException'

Below are the exceptio i got on my

objZip.Save(Response.OutputStream);

Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=DownloadedFile.zip");
Response.ContentType = "application/zip";
objZip.Save(Response.OutputStream);
//Directory.Delete(deletePath, true);
Response.End();

using wkhtmltopdf i am writing the file on the given destitution , which is working ..i checked the location and the file is present there using ioniz.zip i am saving on the zip list ./.

and with the above code i am trying to fetch into zip format from that location