Response.Redirect is not working - asp.net

Question

i am writing a code where after clicking one button one page will be redirected to another nd after opening 2nd page one pdf file will be download just like this website http://www.findwhitepapers.com/content22881 .But instead of opening the 2nd page and downloading the pdf file only pdf file is downloaded but 2nd page is not opening.1st page code is
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("2nd.aspx");
}
2nd page's code is written below.
protected void Page_Load(object sender, EventArgs e)
{
string filepath = "guar-gum/Guar-gum-export-report.pdf";
// The file name used to save the file to the client's system..
string filename = Path.GetFileName(filepath);
System.IO.Stream stream = null;
try
{
// Open the file into a stream.
stream = new FileStream(Server.MapPath("Guar-gum-export-report.pdf"), System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
// Total bytes to read:
long bytesToRead = stream.Length;
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
// Read the bytes from the stream in small portions.
while (bytesToRead > 0)
{
// Make sure the client is still connected.
if (Response.IsClientConnected)
{
// Read the data into the buffer and write into the
// output stream.
byte[] buffer = new Byte[10000];
int length = stream.Read(buffer, 0, 10000);
Response.OutputStream.Write(buffer, 0, length);
Response.Flush();
// We have already read some bytes.. need to read
// only the remaining.
bytesToRead = bytesToRead - length;
}
else
{
// Get out of the loop, if user is not connected anymore..
bytesToRead = -1;
}
}
Response.Flush();
}
catch (Exception ex)
{
Response.Write(ex.Message);
// An error occurred..
}
finally
{
if (stream != null)
{
stream.Close();
//
}
}
}

Answer 1

What do you expect to see on the 2nd page? All you have there is a pdf file. Do you expect an empty page?
Your redirect works fine. When you click the button a PDF file will be sent back to the browser and it will see it as a file that should be downloaded. No page will be sent to the browser so there is no page to see.

Answer 2

Here is the solution:
Don't code what you have done in page2.aspx for file downloading instead put an iframe in the page2.aspx and set the src to the file Url.
I guess it is guar-gum/Guar-gum-export-report.pdf in your case. May be you should change this to start from root of the site by prefix / to the file url.
Put this in page2.aspx
<iframe width="1" height="1" frameborder="0" src="[File location]"></iframe>
It is very simple way and No redirects or JavaScript and your Page2.aspx will also open.
UPDATE
Based on the comments below this answer
I think there is no better solution but here is another mindbending one (psst! hope you and other like..) move the page2.aspx code one for file download ONLY to the third page page3.aspx and set iframe.src to page3.aspx
Reference
SO - How to start automatic download of a file in Internet Explorer