Re: Issue with ZipOutputStream class in my .net application.

I am working on a webapplication and trying to implement a logic of
downloading a .zip file when user clicks on a particular button.
This .zip file should be generated dynamically.

For this, I am using ZipOutputStream class. I am passing my string
(which should be converted as a .zip file) and outputstream. Please
see the below code.

System.Text.ASCIIEncoding encoder = new System.Text.ASCIIEncoding();
byte[] buffer = encoder.GetBytes(toBeZippedString);

ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream);

zipOutputStream.SetLevel(6); // 0 - store only to 9 - means best
compression

ZipEntry entry = new ZipEntry(GetFileName() + "." +
paymentFileType.ToLower().Trim());

entry.DateTime = DateTime.Now;
ICSharpCode.SharpZipLib.Checksums.Crc32 crc = new
ICSharpCode.SharpZipLib.Checksums.Crc32();

entry.Size = buffer.Length;

crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;

zipOutputStream.PutNextEntry(entry);
zipOutputStream.Write(buffer, 0, buffer.Length);
zipOutputStream.Finish();
zipOutputStream.Close();

After executing this logic, user should get a popup window with
the .zip file from server with OPEN, SAVE, Cancel options.

This entire logic is working from my development PC. But, where as
when I deploy this at production server, I am getting an unhandled
exception (Whic is recorded at event log) like below

User:
    Is authenticated: False
    Authentication Type:
    Thread account name: NT AUTHORITY\NETWORK SERVICE

Can anybody help me why this is occuring and what is the fix for this?