Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.error while pdf download

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Dear All,
While download pdf file, following error appear and file unable to download..

Here my coding:

C#

string strFileName = @"D:\\File\1.pdf".ToString();
                   System.IO.FileStream fs = new System.IO.FileStream(strFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
                   //fs = File.Open(strFileName, FileMode.Open);
                   byte[] bytBytes = new byte[(int)fs.Length];
                   fs.Read(bytBytes, 0, (int)fs.Length);
                   fs.Close();
                   Response.AddHeader("Content-disposition", "attachment; filename=" + strFileName);
                   Response.ContentType = "application/octet-stream";
                   Response.BinaryWrite(bytBytes);
                   Response.Flush();
                   Response.End();

I am using Visual studio 2008. Any namespace should add here?
Solve my issue ..
Thanks in Advance

Regards,
Palani Kumar.A

Posted 2-Aug-13 2:58am

PALANI KUMAR.A

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2 solutions

Solution 1

First, adding a namespace isn't going to do anything for you. This just shows that you have no idea what a namespace is or what it's used for.

Second, one of my greatest pet peeves is seeing people call .ToString() on a string. Come on!! Think about that!!

Third, your filename is an invalid path. As written, because of the @ character, your filename is "D:\\File\1.pfd". The double backslash near the beginning is causing a problem.

I think you're not understanding the difference between a string that should be treated literally and one that should be processed for escape sequences. Remove one of the backslashes from the doubled-up pair and it'll fix the problem.

Lastly, If you want to send a file in the response, you can shorten this code up greatly and drop reading the file. You don't need to read it at all:

string strFileName = @"D:\File\1.pdf";
Response.AppendHeader("content-disposition", "attachment; filename=" + strFileName);
Response.ContentType = "application/pdf";
Response.WriteFile(strFileName);

P.S.: What's with the Hungarian notation?? You know, the prepending of the variable type to the name of the variable?? That went the way of the dinosaurs a long time ago.

Posted 2-Aug-13 10:07am

Dave Kreskowiak

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PALANI KUMAR.A · Accepted Answer · 2013-08-05T00:14:00

Solution 2

Dear All,

Thanks guys...

I have solved my issue myself.. Just remove the Update Panel from My Page, It is downloading the file...

Without Update Panel It will working fine....

Regards,
Palani Kumar.A

Posted 5-Aug-13 0:14am

PALANI KUMAR.A