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Response.Redirect thows an uncatchable exception when it is used. That might be why your catch block isn't firing (or maybe it is firing -- in which case Response.Redirect is being called twice).

You might be right. But since the catch block can catch all "Exceptions", how can Response.Redirect throw "uncatchable" exception, which looks irrevelent.

BTW, I tried to debug whether the Response.Redirect is being called twice, but it is called only one time. Once the execution comes to any "if" condition and execute Response.Redirect the exception occurs.

But, what the bug is meant about? I could't understand "native frame is on top of the call stack" -- ???

:)

Hi scott,

First of all sorry to ask this question here. I tried alot to find out everywhere (even in your blogspace) but couln't found any thing appropriate.

Is there any way to give namespaces manually or making it automatically in VS 2005, as like in VS 2003. I am so bugged because, it creates the dll names with inconvinient names and also it creates n number of dll files. I just want to have one or two dll files based on like BL and DAL etc.,

I tried to use the Web deployment project and i got the error "aspnet_merge exited with code 1". I could do nothing with this error and the post in your blogpsace is also closed :(

Please consider this as a urgent case and hope you'll help me.

Thanks

Looks like yr response.redirect in the try is throwing a thread being aborted exception which causes the execution flow to go to the catch where u r doing another redirect which again causes an exception - if u comment out the redirect in the catch block and just spit out the exception in a Response.Write (maybe) what do u see?

It worked.

But the issue is slightly different. Lets assume, that as soon as an exception is caught in the catch block i am trying to redirect to a page where i will deal with the exception. I think, this is a straight forward way.

Iam wondering why in a catch block the Response.Redirect is not working.

Is there any thing that inside a catch block, we should not redirect to another page :)

2 Things.

First, try using the second response.redirect method passing true to end the response. e.g.

Response.Redirect("Success.aspx?evt=1", true)

Second, create a class library project and add that to your solution to get a single dll ala bl dal etc.

No, its not possible to end the response since the page has to do more things :)

So, i cant use end here.

How can you say that separate dll file can solve this problem? can you elaborate it?

If you need your page to do more things then set a flag e.g. IsRedirecting, do your cleanup code and then redirect.

If you create separate libraries for your data and business layers then they will compile to single dll files instead of the multiple ones you were seeing. (Or maybe I just don't understand what you're asking)

I also get the same exception.. I am calling a simple redirect, and catching and logging the exception..

I tried Server.Transfer, preserving the form data, but no dice.. and I too have mutiple dll's referenced inthe same solution. Perhaps this is a debugger issue only?

I'm not sure why that would be..

I'm getting the same problem. It's probably a .NET bug that's gonna be blagged as a feature as usual!

I'm getting the same problem. It's probably a .NET bug that's gonna be blagged as a feature as usual!

I just got the same error when I moved my Server.Transfer/Response.Redirect into the try block.

Previously it was outside and it worked fine (except I don't want it to redirect unless everything is successful which is why I moved it in).

For now I'll use a bool but I'm hoping Scott might provide some insight. Very strange exception...

I guess, it is a problem in ASP.NET itself. Do yo u guys may get same sort of problem in using try..catch blocks with any other classes (like Response/Server classes)

Please do add it up here.

Well Response.Redirect always threw an aborted thread since the end of times.
Have a look at this:
http://support.microsoft.com/kb/312629/EN-US/

As per this article states - use the try-catch block to catch the ThreadAborted exception but the problem comes while trying the catch the exception.

I dont think this is the cause for this error. May be something else.

One more thing here is that the error message is very generic and means in broad ( <i>Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack</i> )


-
Vadi

I'm not exactly sure of the intent of the error message but I got around the error by testing to see if the message contains the "Thread is being aborted" message. Here's an example:

if (ex.Message.StartsWith("Thread") == false)
{
Response.Redirect("~/Error.aspx?ErrorMsg = " + ex.Message);
}

Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack. <-- this error is usually only caused if your response.redirect is in a file that is in a frame. Seems response.redirect doesn't work with frames.

Pls try this link : http://support.microsoft.com/kb/312629/EN-US/

response.redirect("nextpage.aspx",false);
worked for me.

reference:
http://support.microsoft.com/kb/312629/EN-US/

yes, if you use false in the second parameter it will work just fine

Thanks, it works for me too.

hi.. sorry if this has been answered already, I don't have time to read all replies..

your exception is probably caused by the finally {} - as you can see in all possible paths the code will execute a Response.Redirect(), therefore the finally can never be executed.

Remove the finally {} since it does nothing anyway

I too was getting this problem, I had to move the response.redirect out of the try block and it worked. Putting a true or false in the 2nd param of the redirect didn't help.

Hi,

i used in my page Response.Redirect("Events.aspx"); within try catch block

but it is showing execption like "Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack." can any one clear that why it throw exception

Response.Redirect("Events.aspx", false); will work for u.

hi
i m getting error

"Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack."


when i try to execute code for file open/save as dialog box

----------------------
Response.Clear();
Response.ContentType = "application/octet-stream";// type;
Response.AddHeader("content-disposition", "attachment; filename=" + name);
Response.AddHeader("Content-Length", objFileInfo.FullName.Length.ToString());
//Response.TransmitFile(path);
Response.WriteFile(path);
Response.Flush();
Response.End();
-------------------
after this browser run for infinite time and in catch i got error msg.
"Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack."

If u get an exception when you are using
Response.Redirect("ABC.aspx")

Instead of that overload this method and use as follows
Example:

Response.Redirect("ABC.aspx",false)

I have tried it. It works fine

sadf asdf sdf dfasfaskdfs kasd fasdfuhsiadfh iasdif asdgfg asdlfsdl fasg ifsgf asid shvaisufhu uh

http://support.microsoft.com/kb/312629/EN-US/ worked fine,
thanks.

Hi guys, i had the same problem, and i fixed it just taking out my code from the try - catch block, and now works perfect.

Thanks a lot!!

Yes, passing a bool "false" worked for me...!!! thx

I am also facing the same problem while file exporting with in the code, I go through the forums and the solution iworked for me is just remove the Try chatch block OR put Response.End out side of the try cahtch block i will resolve the issue.

I was stunned when i see the error "Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack".

But at last i resolved the issue by adding a parameter "false" after the querystring. eg: Response.Redirect("Default.aspx?id=1,false");

Happy programming

Thanks Suresh for the help. Your reply helped me in solving the issue. Great Job.

Mr.Arun

I think you are a fresher in programming. That's why you are saying that it's a great job. Try to find new innovative programming techniques rather than working in the same job.

regards

I am the answer

I could solve my issue when I set the endResponse parameter.

Response.Redirect(Request.Url.LocalPath, false);

Regards.

If you people need to use response.redirect when line of code written in try are executed successfully then use one int variable as flag and set its value initially to zero and in catch block make it -1 and check value and then below finally block use if and do response.redirect.
This way my problem is solved.

hi,

im not using asp.net, but i may contribute some information, that help you understand the problem.

i am implementing a heavily multithreaded application and i also get this exception now:

"Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack."

in my case the cause for this exception is, that a thread calls Abort() on its own thread-object representation (like MyThread.Abort();). this call happens in a try-catch-block, but the exception is raised not there. it is raised in the method the thread was originally created with (this might be the reason why i read that an "uncatchable" exception is raised - it seems it is just raised where you dont expect it). i have a catch there too (allthough i expected a "ThreadAbortException"), so i have been able to figure out this problem

try this it solve my problem.

http://support.microsoft.com/kb/312629/EN-US/

For solution on Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack

http://dotnetguts.blogspot.com/2009/01/unable-to-evaluate-expression-because.html

i am developing an app in facebook. When user session is null , I need to redirect to facebook login page. Since the app is in Iframe, response.redirect will cause the whole facebook page to load in the IFrame. so I need to use javascript. All my facebook api calls is in a Class, so this is my code
((System.Web.UI.Page)System.Web.HttpContext.Current.Handler).ClientScript.RegisterStartupScript
(typeof(Services), System.Guid.NewGuid().ToString(), string.Format("window.parent.location.href='{0}';", strUrl), true);


My issue is that I need to end the response right after this statement. since no code should be executed when session is not there. So i added

System.Web.HttpContext.Current.Response.Close();
System.Web.HttpContext.Current.ApplicationInstance.CompleteRequest();

Its throwing my the error "Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack"

because the response has ended. WHat should i do in this case

I'm having the problem when I execute the following code:

Response.Clear();

Response.AddHeader("content-disposition", "attachment; filename=vnd.xls");

Response.Charset = "";

Response.Cache.SetCacheability(HttpCacheability.NoCache);

Response.ContentType = "application/vnd.xls";

System.IO.StringWriter stringWrite = new System.IO.StringWriter();

System.Web.UI.HtmlTextWriter htmlWrite =
new HtmlTextWriter(stringWrite);

gdvReport.RenderControl(htmlWrite);

Response.Write(stringWrite.ToString());


Response.End();

I tried every possible solution mentioned here but none of them worked. When I debug this, the error happens when the Response.End() is executed

This error is because u are calling response.redirect between try catch block, when response. redirect under try block is executed catch block in the call stack never executes.

Response.redirect("page.aspx",false);
wokred for me.

Thanks,
Prashant Phalle

One Solution since you dont want to interrupt the normal page flux of the response.
When you get the content to be generated you send that content to a Session Variable...
for ex. in the page export event handler :

Session.Add("MyReport",reportDataString);

Then you use an http Handler to generate content :
instead of response end you do:

Response.Redirect("~/panels/reports/exportExcel.ashx" , false);

The HTTPHANLDER "exportExcel.ashx" has to either implement the interface "IReadOnlySessionState" (for session readonly access) or in case you want to clean the session that has the report generated chunks(html, pdf etc), you implement the interface "IRequiresSessionState"
to write/read access to the session object.
I know this is not the best solution but this was the only one that avoided that exception from being Throwned..

Cheers,

João de Sá

I solve this problem
like that way Response.redirect("URL",false);

But when i publish and upload in my webserver then that is not working, page is refrishing just.

how can i solve this. andy successfully execute vai IIS service.

Response.Redirect(URL, false); works just fine!

I solve this problem

this redirect the page

ScriptManager.RegisterStartupScript(Page, typeof(Page), "nameScript", "window.location.href='YourPage.aspx';", true);

this problem is because update panel and server.trasfer are not compartible (both) , don't working together.

I also faced same .
when ever i deal with response obj , i come across some issue. almost i spent 2 hrs to solve this issue..

after adding
catch (System.Threading.ThreadAbortException ex)
{
}
this catch block in my code.
it works fine...
hope this ll save someones head. :D

use Response.Redirect("your url", false);

none of them worked for me: i don't knwo waht s wrong!!

what if you put the Response.Redirect(yourfile); in the finally block?

Do it like this:
bool isAjax = false;
try
{
Response.Clear();
Response.Write(fnName());
Response.End(); // do not end the response here
isAjax = true;
}
catch()
{
//catch ur exception
}

finally
{
//check is Ajax request
if(isAjax)
Response.End();
}

Hope this will work

Response.Redirect("nextPage.aspx",false);

Works great :)

Finally Response.Redirect("nextPage.aspx",false); worked.

YES !!
...Response.Redirect("~/Contents/Public/ErrorPage.aspx", false);
worked for me too !!
thanx guys

Follow this article it helped me.

http://support.microsoft.com/kb/312629/EN-US/

Use given below code

Response.Redirect("Success.aspx?evt=2", false);

Please use Response.Redirect("page1.aspx" , false);

This happens because you might be using http handlers

When you are doing

Response.Redirect("Mypage.aspx",false);

Always use "False" to end response.

Use Response.Redirect("Success.aspx?evt=2",false); need to pass false param in try catch for Response.Redirect to supress Application_End event.

Pls try this

if (retVal == 0)
Response.Redirect("Success.aspx?evt=0",false);

if (retVal == -2) //Email-Id is already present
Response.Redirect("Success.aspx?evt=1",false);

if (retVal == -1) //Some error occured
Response.Redirect("Success.aspx?evt=2",false);

}

try using
Response.Redirect("Success.aspx?evt=1",false);

hi

U can use the end response overload of the Response.Redirect() method to avoid this error.

For ex,
Response.Redirect("nextpage.aspx",false);

F.U.C.K you man. Why do you want to solve this problem. Lets live with this

Use over loaded function of response.redirect("xtz.aspz", false); this will work fine.

Make second argument of response object is false, please check the code below
response.redirect(url,false);

Njoy.

Response.Redirect("Success.aspx?evt=0" ,false);

add false in the second parameter.

http://support.microsoft.com/kb/312629/EN-US/
use this, this will surly helps you.

use this, this will surly helps you.
http://support.microsoft.com/kb/312629/EN-US/

Use Response.Redirect("Success.aspx?evt=1", false); in all the above cases

I've had similiar issues with try/catch blocks creating oddities. here's mine. http://whileicompile.com/?p=458

Now I'm getting the same problem as you did. pita!

Hi all! i am tried use Response.Redirect("Success.aspx?evt=0" ,false); but why it not worked for me??? who can help me