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

    Question

  • I'm new to this forum. I hope you can help me.

    I'm using the Enterprise edition of VS 2005. When I debug my project an exception is raised - 'Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack'. I can't find anything about this on-line. I suspect this message is hiding the true exception. Does anyone know what this message means?

    Regards,

    Andy Ham

     

    Saturday, February 25, 2006 12:43 AM

Answers

  • Andy,

    There are two things that I would check. First, make sure that you are working with a debug build and not a release build of your project. And second, make sure that you are debugging in mixed mode (both managed and native) so that you can see all of the current call stack.

     

    Thanks,

    Ian

    Monday, February 27, 2006 6:33 PM
    Moderator

All replies

  • Andy,

    There are two things that I would check. First, make sure that you are working with a debug build and not a release build of your project. And second, make sure that you are debugging in mixed mode (both managed and native) so that you can see all of the current call stack.

     

    Thanks,

    Ian

    Monday, February 27, 2006 6:33 PM
    Moderator
  • Hi Ian,

    Thanks for your help. I can confirm that I was using debug mode anyway, but I'll take your second suggestion into accout, the next time I get this error.

    Fortunately, after removing a try-catch block and adding a Trace I managed to get the code working again. I'm still not sure what the cause of the original problem was, but at least I can continue now. Thanks again!

    Regards,

    Andy

     

    Tuesday, February 28, 2006 5:39 AM
  • Andy,

    No problem, glad that I could help. Just come back to these forums if you have any more development issues.

     

    Thanks,

    Ian

    Tuesday, February 28, 2006 4:58 PM
    Moderator
  • Ian,

    I am expressing the same issue.  I can provide a sample code block that shows the issue.  Before I provide the code block, I would like to try your suggestion of debugging in mixed mode (both managed and native) so that I can see all of the current call stack; however, I can figure out where to set the mixed mode debugging.  Where in VS2005 do I set this option?

    Thanks,
    Jim.

    Wednesday, March 01, 2006 7:30 PM
  • Jim,

    Check under the following:

    Debug->Attach to Process

    In the attach to process dialog hit the "Select..." button and check the boxes for both Native and managed code. Now you will attach in mixed mode for debugging.

     

    Thanks,

    Ian

    Wednesday, March 01, 2006 8:11 PM
    Moderator
  • Dear Ian,

    I have similar problem which showing these unable.. message in the debugging in VS 2005 Team Suite (released).
    I had my attached debug module in both Native & Managed code mode, the module I attached to debug is in debug mode ( its the windows service app).
    Not having any error (yet!) but unable to look at values of any objects as it's showing this message.
    - Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack

    Hope you can help me.

    Thank you
    Punprom Kasemsant

    Thursday, April 20, 2006 5:05 PM
  • I have a similar problem...here is the code for a 'csv' download. Can someone help?

    Response.Clear();

    Response.ClearHeaders();

    //set the conttent type of the file to be downloaded (IF NEEDED)

    Response.ContentType = "application/vnd.ms-excel";

    // initialize the http content-disposition header to indicate a file attachment with the filename

    Response.AppendHeader("Content-Disposition", "Attachment; Filename=\"" + strFileNameCSV + "\"");

    //// transfer the file byte-by-byte to the response object

    FileInfo fileToDownload = new FileInfo(strFileNameCSV);

    Response.Flush();

    Response.WriteFile(fileToDownload.FullName);

    Response.End();

    Monday, April 24, 2006 4:53 PM
  • Seems to ba a relatively common thing. I am still attempting to figure it out. I have a Dataset that I am using to populate a .CSV file and provide the ability for the end user to 'download' the resulting file. I am populating the dataset and populating a DataTable with it. I am then creating the Folder and File with the extension '.CSV'. I then populate the file row by row using a string. The file is in the correct location, format (.CSV) and properly populated at this point.

    I then call a function that I have attempted to allow the user to download the file. I have attempted this in several different fashions using the Response object. All attempts are downloaded without the .CSV extension. I have pasted some of the code to preform this function below. I do trap an error that states "Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack". I have 'Googled' this error and modified my VS Options>Debugging>Just-in-Time to all the Debug in mixed mode (Managed and Native). The error occurs when I step through the code at the Response.End
    I have attempted this with the HtmlTextWriter, StringWriter, StreamWriter and StringBuilder all with the same result.

    Can someone assist?


    string strFileNameCSV = "C:\\ExportReports\\Export_CSV_" + ReportForm1.strUserID + ".csv";
    //FileInfo fiBPM_Export = new FileInfo(strFileNameCSV);

    //Clear Headers
    Response.Clear();
    Response.ClearHeaders();

    // initialize the http content-disposition header to indicate a file attachment with the filename
    Response.AppendHeader("Content-Disposition", "Attachment; Filename=\"" + strFileNameCSV + "\".csv");

    ////// transfer the file byte-by-byte to the response object
    //FileInfo fileToDownload = new FileInfo(strFileNameCSV);
    //Response.Flush();
    //Response.WriteFile(fileToDownload.FullName);
    Response.WriteFile(strFileNameCSV);
    //Response.TransmitFile(strFileNameCSV);
    //Response.Redirect(strFileNameCSV);
    Response.End();

     

    Wednesday, May 03, 2006 7:39 PM
  • I have received the "Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack" but only when I am trying to perform a redirect from within a try catch block. If I move the redirect outside the block it works fine. I created a bool value that was set in the try catch block and then performed an if statement against the bool to perform the redirect. Not my first choice for coding but it solved my problem and allowed me to me on. Good luck.
    Wednesday, May 10, 2006 2:33 PM
  • Ian,

    A small correction........it is Tools > Attach to Process instead of  Debug->Attach to Process

     

    Thanks

    Rajesh Medackel, India

     

     

    Monday, May 29, 2006 6:21 AM
  • I believe the answer to your problems are explained here
    • Proposed as answer by Vijay Jadhav Wednesday, October 20, 2010 10:38 AM
    Monday, June 26, 2006 6:41 PM
  • Thanks!!

    I was having the same problem here.. and now it works..

    once again. thanks.

    Wednesday, August 02, 2006 11:59 PM
  • Hello,

    I am having a similar problem except I am attempting to debug a SQL server 2005 c# assembly remotely.

    If I try to set the attach process parameters to use anything but the default "Automatic: T-SQL code, Managed code", then I cannot issue a "Detach All" from within Visual Studio as this is grayed out. I then have to issue a "Terminate All" which forces SQL server 2005 to hang up and I have to restart the SQL server services. In addition, my break points are ignored.

    The problems come with trying to access an SQL data reader.  Typical code is as follows:

    using (SqlConnection c = new SqlConnection("context connection=true"))

    {

    SqlCommand cmd = new SqlCommand();

    cmd.Connection = c;

    cmd.CommandText = "SELECT TestID, TestName, TestTypeID from inserted";

    if (c.State != ConnectionState.Open)

    c.Open();

    SqlDataReader r = cmd.ExecuteReader();

    int TestID = 0;

    int TestTypeID = 0;

    string TestName = "Control";

    if (r.HasRows)

    {

    r.Read();

    TestID = int.Parse(r["TestID"].ToString());

    TestTypeID = int.Parse(r["TestTypeID"].ToString());

    //*********************************

    //TODO: ItemName is specific to each table, so make sure it's ok

    TestName = r["TestName"].ToString();

    }

    r.Close();

    }

    On trying to assign to the variables, from the reader, the values of the items of the reader, r, are replaced with the "Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack" and the debugger exits at that point.

    Any ideas

    Thanks

    William  

    Tuesday, August 15, 2006 9:36 AM
  • Func-eval (property evaluation) is evil.

    What the error means is that the thread is currently stopped in either (a) optimized code or (b) in native code (really, anywhere outside of code that was not directly generated from IL ).

    For a) switching to debug-mode will help. However, if you've stopped in a 3rd-party dll (or the FX), that code may still be optimized even if your project's code is debug. Hitting Break at when a System.Diagnostics.Debug.Assert fires is an example of this. The code that implements Debug.Assert is in a separate library (system.dll) which is optimized even if the rest of your solution is non-optimized.

    In this case, the intersting thing is to get a callstack of where the thread is. The real problem may be that the thread shouldn't even be stopped there in the first place.

    For b) func-eval can only be initiated in code that was jitted from IL. So you can't initiate a func-eval of a managed method if your thread is outside of managed code.  There are further restrictions too (some listed here)

     

     

    More gory technical details are here:

    http://blogs.msdn.com/jmstall/archive/2005/11/15/funceval_rules.aspx

    Tuesday, August 15, 2006 3:30 PM
    Moderator
  • Hi Mike,

    Many thanks for the information provided. If I do not run the debugger then all is fine and well. So the question is; How does one access, in my case, the information in the "inserted" table?  If I cannot use property getters then I am truly stumped.

    The link provided indicated that r["somecolumn"].ToString() was an invitation to trouble. So you can see the pickle I'm in in that there doesn't seem to be a way of accessing the "inserted" table without falling foul of func-eval(property evaluation).

    Kind regards

    William

    Thursday, August 17, 2006 10:24 AM
  •  

    I am also experiencing this problem. However, it only happens when the screen is being idle for some amount of time. I have no idea why the response.redirect statement causing that error. It works fine as long as the application is constanly being used. The error goes away after I remove the try and catch blocks but then I encounter a new problem with the statement below:

    sUserId = new Guid(Session["QAUSERID"].ToString()); 

    The new error arises because the session variable above is null. For some reason when the screen is being idle, the session variable's value is gone.

    Hope someone can help me. Thanks in advance.

    blumonde

    Monday, August 21, 2006 5:36 AM
  • Hi,
    I also encountered the same problem.
    When Response.Redirect is moved from try block to finally block it worked .

    Regards,
    Nishant Sharma


    • Proposed as answer by K Senthil Friday, July 25, 2008 2:06 PM
    Friday, October 06, 2006 10:41 AM
  • I tried the workaround (using HttpContext.Current.ApplicationInstance.CompleteRequest(); to replace  //HttpContext.Current.Response.End();)and it gives me "Unable to read file" message.

     

     

    Friday, November 17, 2006 9:51 AM
  • Thanks Nishant.

    I moved

    HttpContext.Current.Response.End();

    to the finally block and it works perfectly.

    (NOTE: http://support.microsoft.com/kb/312629/EN-US/ not working for me and gives error of "Unable to read file")

    David

     

    Friday, November 17, 2006 10:02 AM
  • I faced same problem but could resolve it when I moved REsponse.Redirect outside try catch block.

    Similarly it is the same for

    HttpContext.Current.Response.End();


    or response.end


    For any clarification contact me.

    • Proposed as answer by itthirit Friday, August 17, 2012 9:03 AM
    Monday, December 04, 2006 3:27 PM
  • I too got rid of this error by moving the response.redirect statements into finally block.

    Is it a bug with VS2005?  because i am not able to get the reason why it is coming.

     

     

     

    Thursday, December 14, 2006 7:01 AM
  • I really didn't have the rime to read all the responces so what i will say might have been said before..

    but the solution is to add another boolian parametar.

    i mean your code should be like Resoponce.Redirect("Page.aspx", false);

    Hope this could help

    Sunday, December 17, 2006 9:39 AM
  • Instead of this:
    try
    {
        string someUrl = "http://www.microsoft.com";
        Response.Redirect(someUrl);
    }
    catch
    {}

    Try this approach instead:
    try
    {
        string someUrl = "http://www.microsoft.com";
        Response.Redirect(someUrl, false);
    }
    catch
    {}

    This allows the current thread to exit gracefully and not die immediately.
    • Proposed as answer by Scrummer Monday, December 28, 2009 3:21 PM
    Wednesday, January 03, 2007 1:11 AM
  • Hello Shawn O,

    You need to add this line

    Response.ContentType = "application/octet-stream"

    Before this line

    Response.AppendHeader("Content-Disposition", "Attachment; Filename=\"" + strFileNameCSV + "\".csv");

     

     

     

     

    Thursday, January 11, 2007 9:08 AM
  • Hi,

    I was also having same problem, but now it is solved.

    Thanks

    Shital

    Saturday, February 24, 2007 11:40 AM
  • I was comming accross the same problem , but this did work for me, Thank You very Much

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

    • Proposed as answer by Scrummer Monday, December 28, 2009 3:21 PM
    Thursday, April 26, 2007 11:03 AM
  • Hi Shaddix,

     

    Thanks for giving the right link.

     

    Thanks again.

     

    Thanks

    Sushil Jinder

    Sushil.Jinder@Gmail.com

    Wednesday, May 16, 2007 9:13 AM
  • Hi,

     

       Will this cause to expire the session frequently. Pls help

    Friday, July 20, 2007 6:53 AM
  • Hi rajesh,

    I am not getting tools>Attach to process as i am also facing the same problem.

    Sumit

    Monday, July 23, 2007 3:05 PM
  • Hello Andy,

    Iam facing the same problem but my scenario is different.

     

    when i start my application for the first time, it runs fine. After signout when i signin again, after successfull signin, the system throws the exception when i use response.redirect().

     

    i have also noticed that, after signin, when i put any thing in the session variable, i face this problem, else the system works fine, and i need to put the user name and id in the session when the user logs in

     

    the other thing which i have noticed is that, when i close the browser window after signout, and signin in a new window, the system works fine.

     

    P.S: iam not using asp.net authentication and authorization, and iam also removing all the session variables on signout using session.abandon() and session.clear()

     

    Monday, January 14, 2008 6:42 AM
  •  

    ok i was also facing the same problem but when i moved to finally block its not throwing any exceptions....

     

     

    but why i want to know the reason...can you tell me.....

     

    Abinash T

    Monday, February 04, 2008 5:19 AM
  • Do one thing. Create a new Ajax enabled web site project.

    And copy its web .config file to your web site project.

    Add your project related settings there, such as db connection string, impersonate tag etc.

     

    Thats it.

    And run your website again. You will never see that error again

     

    Also you try to use Response.Redirect("") instead of Server.Transfer(""). This may fix the problem.

     

     

    Saturday, March 15, 2008 7:01 AM
  • Thanks Wes,

     

    The link was helpful.

     

    Tuesday, March 18, 2008 12:41 PM
  • cheers Wes (y)
    Monday, April 28, 2008 11:46 AM
  •  

    Try after puting your Response.Redirect line in finally { ...}
    Friday, May 09, 2008 6:49 AM
  • Thanks,

    This solved my prob.


    Tuesday, May 27, 2008 6:51 PM
  • Thanks Nishant. I hope this will solve the problem. You can't put Response.Redirect or Response.End in the Try Catch block I guess.
    Success is where preparation and opportunity meet.
    Friday, July 25, 2008 2:08 PM
  • Tuesday, September 23, 2008 7:00 PM
  • Tuesday, September 23, 2008 7:07 PM
  • Hi

    I have experienced this problem in SharePoint, I also got the 
    {Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.} exception

    I had a FormsAuthentication.RedirectFromLoginPage(sDecryptedUsername, true); call that would redirect after a user have logged in. It is as if the code knows that there is another thread spawned, and anything before or after the redirect causes this error. Mine was particularly when I tried to add a new list to the SPWeb

    spweb.Lists.Add("Title", "Description", SPListTemplateType.DocumentLibrary);




    Monday, December 22, 2008 4:58 PM
  • I was using VS2008. I was having the same problem when having Response.Redirect ("pagename.aspx") within a try block.
    Now I used Response.Redirect("pagename.aspx",false). It started working fine
    Sunday, March 01, 2009 1:55 AM
  • HttpContext.Current.Response.End();
    just type in Catch Block and seee probelm will be solved.
    Thursday, April 30, 2009 4:01 AM
  • I believe the answer to your problems are explained here

    Its kind of wierd. I was using server.transfer i never got error. Now I have to add some more things to application and I have got this error. Thanks for posting it. After i changed it to respons.redirect with false i am able to go on.
    Sunday, June 14, 2009 3:02 AM
  • If you received the error in this thread and you have a Response.Redirect in a try catch, then your best answer for this is from Wes and Jared.  It works to move the Response.Redirect out of the try catch as well, but this is a bit easier.  If you get the error because of something else, then some of the other responses to this thread may help you as well, but for the Response.Redirect in the try catch, this should do it for you.
    From Wes Shaddix:

    I believe the answer to your problems are explained here

    AND

    From Jared Turner:

    Instead of this:
    try
    {
        string someUrl = "http://www.microsoft.com";
        Response.Redirect(someUrl);
    }
    catch
    {}

    Try this approach instead:
    try
    {
        string someUrl = "http://www.microsoft.com";
        Response.Redirect(someUrl, false);
    }
    catch
    {}

    This allows the current thread to exit gracefully and not die immediately.
    • Proposed as answer by marvin bland Tuesday, November 24, 2009 2:52 PM
    Monday, October 19, 2009 5:24 PM
  • I ran into the same situation. See the code below. The issue related to me having my Redirect.Response(HomePageScr.aspx) within my try block of code. For some extenuating reason, once the redirect row was hit, the code fell through into the CATCH block. I simply removed the Response.Redirect("HomePageScr.aspx");
    from within the TRY block and things worked according.

    protected

     

    void SetUpCookieData()

    {

     

    try

    {

     

    //Get UserID

    userID = GetUserID();

     

    //Get User Info

    GetUserInfo(userID);

     

    //Set User Cookie

     

    HttpCookie aCookie = new HttpCookie("userInfo");

    aCookie.Value =

    Convert.ToString(empTypeID);

     

    aCookie.Value("lastVisit") = DateTime.Now.ToString();

    Response.Cookies.Add(aCookie);

    Response.Redirect("HomePageScr.aspx");

    }

     

    // LogAccess(UserID);

     

    //Call Main Menu

     

    }

     

    catch (Exception CookieError)

    {

     

     

    this.lbl_dbError.Visible = true;

     

    this.lbl_dbError.Text = CookieError.Message;

     

     

    }

     

     

    Tuesday, November 24, 2009 2:57 PM
  • Thanks buehlej


    Regards
    Rajendra Yerra
    Tuesday, December 01, 2009 7:00 AM
  • "Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack." was my error, as well.

    I found that, in addition to the causes at http://support.microsoft.com/kb/312629/EN-US/, as mentioned, that Thread.Abort(); placed after the Thread has already completed also causes this exception.  At least it did for me.  I just removed the line and all was well.

    -Tom
    Thursday, January 28, 2010 11:15 PM
  • Hello

    U just add false as a second argument

    like

     Response.Redirect(".aspx?ID=" + _ID,false);

     

    Thanks

    Tuesday, June 15, 2010 10:26 AM
  • even i m facing the same problem with response.redirect() thing.

    following is the code:

    	String adPath = "LDAP://bw.com"; //Fully-qualified Domain Name
            LdapAuthentication adAuth = new LdapAuthentication(adPath);
            if (true == adAuth.IsAuthenticated(txtDomain.Text, txtUsername.Text, txtPassword.Text))
            {
                String groups = adAuth.GetGroups();
                //Create the ticket, and add the groups.
                bool isCookiePersistent = chkPersist.Checked;
                FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket(1, txtUsername.Text,
                                                          DateTime.Now, DateTime.Now.AddMinutes(60), isCookiePersistent, groups);
                //Encrypt the ticket.
                String encryptedTicket = FormsAuthentication.Encrypt(authTicket);            
                //Create a cookie, and then add the encrypted ticket to the cookie as data.
                HttpCookie authCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket);
                authCookie.Values["Name"] = txtUsername.Text;
    
                if (true == isCookiePersistent)
                    authCookie.Expires = authTicket.Expiration;
                //Add the cookie to the outgoing cookies collection.
                Response.Cookies.Add(authCookie);
            }
            else
            {
                errorLabel.Text = "Authentication did not succeed. Check user name and password.";
            }
            //You can redirect now.
            Response.Redirect("~/home.aspx", false);

    i tried removing the try-catch block but to my surprise it worked fine for first 2-3 logins and then started giving anonymous errors.

    like, unable to evaluate the expression or wont give any error but will remain on login page.

    i am not able to debug this problem can anyone help me out

    where is the error in code?

     

     

    Monday, July 19, 2010 8:20 AM
  •  I had this same problem too, and it was tricky. For me, it was because I'm using Ext.Js javascript library. If you are doing a response.redirect in server-side code that you accessed in an Ajax call, there are problems. Ext.js has a workaround with their Ext.Redirect method.
    Thursday, September 02, 2010 5:06 PM
  • All-Star Hua-Jun Li - MSFT

    http://forums.asp.net/t/1488928.aspx

    Based on my experience,your server code has something wrong, please change it.

    Firstly, you should add the following code at the begining of  Page_Load event.

    Response.Clear();

    Secondly,you can't put 'Response.End();' into try catch block, it will cause the problem you mentioned.

    You can remove it and use it directly.

    Response.End(), aborts the current thread. if you call inside a try block,you will catch the thread abort. if you use a try block, you'll need to catch the abort and rethrow it.

    Another way you can use 'ApplicationInstance.CompleteRequest' method instead of 'Response.End();'.

    Please check the following link:

    http://forums.asp.net/t/984756.aspx

    http://bytes.com/topic/asp-net/answers/769508-error-response-end-unable-evaluate-expression

    http://geekswithblogs.net/vadivelkumar/archive/2006/02/25/70703.aspx

     


    xavier luz
    Friday, September 17, 2010 3:58 PM
  • Wes,

    Thanks!!

    I was facing same problem,  now it works fine.

    Thanks.

     


    "Knowledge Shared Is Knowledge Gained"
    Wednesday, October 20, 2010 10:38 AM
  • hi please remove Response.End(); from your code it will work
    Thursday, December 23, 2010 10:40 AM
  • I found the same problem while I was using a Thread to get web response in my application. After removing the try-catch block the error exception was gone but didn't find why the thread work imperfectly like abruptly kicking out the incomplete thread.

    Still can't understand or resolve the problem. 


    Prithwi Raj Biswas
    • Proposed as answer by Prithwi Raj Saturday, January 08, 2011 7:37 PM
    Saturday, January 08, 2011 7:35 PM
  • I resolved it by removing ajax function in aspx file.
    try

           
    {
    Reponse.clear();
    ...... //code to export excel file.
                Response.End();
           
    }
           
    catch(Exception e1)
           
    {
               
    throw e1;

           
    }
    I am using above code and got the same error, and I resolve the problem using below methods:
    1, remove try catch code,
    2.remove Ajax code in aspx file,

    work well.
    Tuesday, May 03, 2011 3:03 AM
  • This work with above solution

    Thanks

     

    Monday, June 20, 2011 7:21 PM
  • Hi Friend,

             Your code

    Response.ContentType = "application/octet-stream" was saved much more time.

     

    Thank you so much

     

    Regards,

    Karthick Raj

    Thursday, July 28, 2011 3:50 PM

  • For example, If you are using Response.Redirect("test.aspx") use Response.Redirect("test.aspx",false). This will solve the problem.

    For further detail...

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

    Friday, March 16, 2012 2:15 AM
  • It worked for me... Looking for solving d issue since last 2-3 days. but could not get success.

    Thanks

    Friday, August 10, 2012 7:00 PM