Download file from FTP and how prompt user to save/open file in ASP.NET C#

So, assuming you’re writing the FTP request’s response stream down to the ASP.NET response stream, and want to trigger the download dialog in the browser, you’ll want to set the Content-Disposition header in the response.

// note: since you are writing directly to client, I removed the `file` stream
// in your original code since we don't need to store the file locally...
// or so I am assuming
Response.AddHeader("content-disposition", "attachment;filename=" + strFile);

byte[] buffer = new byte[2 * 1024];
int read;
while ((read = responseStream.Read(buffer, 0, buffer.Length)) > 0) 
{ 
   Response.OutputStream.Write(buffer, 0, read);
}

responseStream.Close();
response.Close();