asp net Invalid postback or callback argument

Question

I am getting this error   Server Error in     Application   Invalid postback or callback argument   Event validation is enabled using  lt pages enableEventValidation  true   gt  in configuration or  lt    Page EnableEventValidation  true    gt  in a page   For security purposes  this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them   If the data is valid and expected  use the ClientScriptManager RegisterForEventValidation method in order to register the postback or callback data for validation   Description  An unhandled exception occurred during the execution of the current web request  Please review the stack trace for more information about the error and where it originated in the code    Exception Details  System ArgumentException  Invalid postback or callback argument   Event validation is enabled using  lt pages enableEventValidation  true   gt  in configuration or  lt    Page EnableEventValidation  true    gt  in a page   For security purposes  this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them   If the data is valid and expected  use the ClientScriptManager RegisterForEventValidation method in order to register the postback or callback data for validation   Source Error    An unhandled exception was generated during the execution of the current web request  Information regarding the origin and location of the exception can be identified using the exception stack trace below   Stack Trace      ArgumentException  Invalid postback or callback argument   Event validation is enabled using  lt pages enableEventValidation  true   gt  in configuration or  lt    Page EnableEventValidation  true    gt  in a page   For security purposes  this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them   If the data is valid and expected  use the ClientScriptManager RegisterForEventValidation method in order to register the postback or callback data for validation      System Web UI ClientScriptManager ValidateEvent String uniqueId  String argument   8627417    System Web UI WebControls ListBox LoadPostData String postDataKey  NameValueCollection postCollection   360    System Web UI WebControls ListBox System Web UI IPostBackDataHandler LoadPostData String postDataKey  NameValueCollection postCollection   13    System Web UI Page ProcessPostData NameValueCollection postData  Boolean fBeforeLoad   346    System Web UI Page ProcessRequestMain Boolean includeStagesBeforeAsyncPoint  Boolean includeStagesAfterAsyncPoint   1743  Version Information  Microsoft  NET Framework Version 2 0 50727 3623  ASP NET Version 2 0 50727 3618   What does it mean   Here is my code    lt    Page EnableEventValidation  true  Language  C   AutoEventWireup  true  CodeBehind  WebForm1 aspx cs  Inherits  EnterData DataEntry WebForm1    gt        lt  DOCTYPE html PUBLIC  -  W3C  DTD XHTML 1 0 Transitional  EN   http   www w3 org TR xhtml1 DTD xhtml1-transitional dtd  gt    lt html xmlns  http   www w3 org 1999 xhtml   gt   lt head runat  server  gt       lt title gt  lt  title gt        lt script src  http   ajax googleapis com ajax libs jquery 1 6 4 jquery min js  type  text javascript  gt  lt  script gt       lt script src  https   ajax googleapis com ajax libs jqueryui 1 8 16 jquery-ui js  type  text javascript  gt  lt  script gt        lt link href     niceforms niceforms-default css  rel  stylesheet  type  text css    gt       lt script src     niceforms niceforms js  type  text javascript  gt  lt  script gt        lt link href     jquery-ui-1 8 16 custom css  rel  stylesheet  type  text css    gt       lt style type  text css  gt           list-problems           height 600px  important          width 200px  important          display inline-block             lt  style gt        lt script gt          jQuery function                    occurrence dateTextBox   mask  99 99 9999                   lt    report dateTextBox ClientID   gt    mask  99 99 9999                 lt    occurrence dateTextBox ClientID   gt    datepicker                 lt    report dateTextBox ClientID   gt    datepicker                  datepicker   datepicker                    function               get     file txt   function data                var output   data split   n                tmp                   for  i   0  i  lt  output length  i                      tmp      lt option value     output i      gt     output i      lt  option gt                                  lstProblems   html tmp                               function                select   multiselect                 function getselectedproblems             var selectedLanguages   new Array            jQuery   lstProblems option selected   each function                 selectedLanguages push jQuery this  val                             lt  script gt    lt  head gt   lt body gt  lt div id  container  gt       lt form id  form1  runat  server  class  niceform  gt            lt fieldset gt            lt legend gt Section A lt  legend gt            lt dl gt                lt dt gt  lt label for  occurrence dateTextBox   gt Occurrence Date  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  occurrence dateTextBox  runat  server  size  50   gt  lt  dd gt           lt  dl gt            lt dl gt                lt dt gt  lt label for  report dateTextBox  gt Report Date  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  report dateTextBox  runat  server  size  50   gt  lt  dd gt           lt  dl gt            lt dl gt                lt dt gt  lt label for  spec idTextBox  gt Specimen ID  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  spec idTextBox  runat  server  size  50   gt  lt  dd gt           lt  dl gt            lt dl gt                lt dt gt  lt label for  batch idTextBox  gt Batch ID  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  batch idTextBox  runat  server  size  50   gt  lt  dd gt           lt  dl gt            lt dl gt                lt dt gt  lt label for  report byTextBox  gt Report By  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  report byTextBox  runat  server  size  50   gt  lt  dd gt           lt  dl gt            lt dl gt                lt dt gt  lt label for  identified byTextBox  gt Identified ID  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  identified byTextBox  runat  server  size  50   gt  lt  dd gt           lt  dl gt            lt  fieldset gt            lt fieldset gt           lt legend gt Section B lt  legend gt            lt dl gt                lt dt gt  lt label for  problemTextBox  gt Problem  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  problemTextBox  runat  server  size  50   gt  lt  dd gt             lt  dl gt            lt dl gt               lt dt gt  lt label for  lstProblems  gt Problems List  lt  label gt  lt  dt gt               lt dd gt                   lt asp ListBox ID  lstProblems  runat  server  SelectionMode  Multiple  CssClass  list-problems  gt  lt  asp ListBox gt               lt  dd gt            lt  dl gt              lt dl gt                   lt dd gt  lt select size  8  multiple  true   gt                   lt optgroup label  Europe  gt                       lt option gt United Kingdom lt  option gt                       lt option gt Luxembourg lt  option gt                   lt  optgroup gt                       lt optgroup label  Asia  gt                       lt option gt India lt  option gt                       lt option gt Dubai lt  option gt                   lt  optgroup gt               lt  select gt   lt  dd gt               lt  dl gt           lt dl gt               lt asp ListBox ID  ListBox1  runat  server  DataSourceID  SqlDataSource1                   DataTextField  batch  DataValueField  batch  SelectionMode  Multiple                   Height  100px  Width  329px  gt  lt  asp ListBox gt               lt asp SqlDataSource ID  SqlDataSource1  runat  server                   ConnectionString   lt    ConnectionStrings LOM   gt                    SelectCommand  SELECT  batch  FROM  lom batch   gt  lt  asp SqlDataSource gt           lt  dl gt            lt  fieldset gt            lt fieldset gt           lt legend gt Section C lt  legend gt           lt dl gt                lt dt gt  lt label for  section c issue error identified byTextBox  gt Issue Error Identified By  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  section c issue error identified byTextBox  runat  server  size  50   gt  lt  dd gt             lt  dl gt            lt dl gt                lt dt gt  lt label for  section c commentsTextBox  gt Comments  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  section c commentsTextBox  runat  server  size  50   gt  lt  dd gt             lt  dl gt                   lt  fieldset gt            lt fieldset gt           lt legend gt Section D lt  legend gt           lt dl gt                lt dt gt  lt label for  section d investigationTextBox  gt Investigation  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  section d investigationTextBox  runat  server  size  50   gt  lt  dd gt             lt  dl gt            lt  fieldset gt            lt fieldset gt           lt legend gt Section E lt  legend gt           lt dl gt                lt dt gt  lt label for  section e corrective actionTextBox  gt Corrective Action  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  section e corrective actionTextBox  runat  server  height  200  TextMode  MultiLine  size  50   gt  lt  dd gt             lt  dl gt             lt  fieldset gt            lt fieldset gt           lt legend gt Section F lt  legend gt           lt dl gt                lt dt gt  lt label for  section f commentsTextBox  gt Comments  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  section f commentsTextBox  runat  server  size  50   gt  lt  dd gt             lt  dl gt            lt  fieldset gt            lt fieldset gt           lt legend gt Pre-Analytical lt  legend gt           lt dl gt                lt dt gt  lt label for  prePracticeCodeTextBox  gt Practice Code  lt  label gt  lt  dt gt               lt dd gt  lt asp TextBox ID  prePracticeCodeTextBox  runat  server  Visible  false   gt  lt  dd gt             lt  dl gt            lt dl gt                lt dt gt  lt label for  preContactTextBox1  gt Contact  lt  label gt  lt  dt gt                lt dd gt  lt asp TextBox ID  preContactTextBox  runat  server  Visible  false   gt  lt  dd gt             lt  dl gt            lt dl gt               lt dt gt  lt label for  CheckBox1  gt PreAnalytical  lt  label gt  lt  dt gt               lt dd gt   lt asp CheckBox ID  CheckBox1  runat  server  CausesValidation  false                              Visible  true  AutoPostBack  true  OnCheckChanged  CheckBox1 CheckedChanged   gt  lt  dd gt           lt  dl gt            lt  fieldset gt            lt asp Button ID  Button1  runat  server  Text  Button  OnClick  SubmitData   OnClientClick  JSfunction     gt        lt  form gt    lt  div gt  lt  body gt   lt  html gt    What am I doing wrong    I am getting this error after I press the submit button

User · Answer

You can add ViewStateMode  Disabled    asp UpdatePanel ID  UpdatePanel1  runat  server  ViewStateMode  Disabled

User · Answer

Another thing to watch out for  is that this error can happen if you have a nested    lt form   tag within the  Net form

User · Answer

Ah its unfortunate  Since you add them essentially client side asp net blows up  It is also unfortunate you d have to turn off EventValidation as there are some important protections that helps  for instance evil injection into drop down boxes   The other alternative is to make your own composite control  which of course here seems a bit more than the effort involved  I d prob turn off event validation too but be very careful that you don t trust any values from the page that could be used in a bad manner by simply changing them - like hidden keys  sql injection through combo boxes  etc

User · Answer

in you aspx file  you should put the first line as this      lt    Page EnableEventValidation  false    gt    if you already have something like   lt    Page  so just add the rest    EnableEventValidation  false    gt   I recommend not to do it

User · Answer

If you have code in your Page Load   event  Try adding this   if   Page IsPostBack       your code here

User · Answer

This error can also be caused by nested  lt form gt  tag in the master page which is not allowed     lt form id  someid  gt  lt  form gt    This will likely be the cause if you have picked up a template and copying the code from somewhere as it   Solution  You have to break the nesting of  lt form gt  tag  The following should become   lt form method    name  form1  gt     lt form method    name  form2 gt     lt  form gt   lt  form gt    should become   lt form method    name  form1  gt       lt  form gt    lt form method    name  form2 gt       lt  form gt

User · Answer

If you look at the first lines of text you can glean what your error is        this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them   You re dynamically editing the lstProblems dropdown  so when you post back ASP NET says  Warning   Invalid entries in the dropdown   and freaks out throwing that error   You have to determine if turning off event validation is an OK solution  but I would research it before doing it  since the idea behind it is to make your site more secure for free   Here s another stackoverflow answer that does a much better job explaining what to do than me  Invalid postback or callback argument   Event validation is enabled using   39  lt pages enableEventValidation  quot true quot   gt   39

User · Answer

if you change UseSubmitBehavior  True  to  UseSubmitBehavior  False  your problem will be solved    lt asp Button ID  BtnDis  runat  server  CommandName  BtnDis  CommandArgument   lt   Eval  Id    gt   Text  Discription  CausesValidation  True  UseSubmitBehavior  False    gt

User · Answer

I had a similar problem because of copy paste from another page  what I got    lt form id  form1  runat  server  gt               lt form id  form2  runat  server  gt                lt  form gt   lt  form gt    I just removed form with id  form2  inside form with id  form1  and issue gone  This could be not your problem but it could be something similar

User · Answer

I had the same problem  two list boxes and two buttons   The data in the list boxes was being loaded from a database and you could move items between boxes by clicking the buttons   I was getting an invalid postback   turns out that it was the data had carriage return line feeds in it which you cannot see when displayed in the list box   worked fine in every browser except IE 10 and IE 11   Remove the carriage return line feeds and all works fine

User · Answer

Add on top page  protected void Page Load object sender  EventArgs e            if   Page IsPostBack                  Code display data

User · Answer

My solution was to add   ctlUpdatePanel Update      after binding control after postback  it was in updatepanel with UpdateMode  Conditional  attribute

User · Answer

This is probably not the cause of your issue  but I noticed you were using optgroups in your dropdown so I figured this might help someone should they wind up here with this issue   For me  I needed to create a dropdownlist that would render with optgroups  and I ended up using the accepted answer here but while it would render the control correctly  it gave me this error   How I got past that is detailed in my answer here

User · Answer

I had this same problem with a datalist I m dynamically binding  adding EnableViewState  false  quieted the error message  I figure if I m binding programmatically  then the control is being populated on each post back  the view state doesn t have to be maintained if it may or may not change on each call back  that s why I m dynamically binding it  lol

User · Answer

After having this problem on remote servers  production  test  qa  staging  etc   but not on local development workstations  I found that the Application Pool was configured with a RequestLimit other than 0   This caused the app pool to give up and reply with the exception noted in the question   Somewhere along the way my installshield project had its App pool definition changed to use  3   probably just a mis-click or mis-type

User · Answer

My problem was that i had nested form tags  After removing the inner one  worked out for me

User · Answer

You can also fill you data in the prerender event  This way you can keep your validation and stay secure  Here is an example using a repeater   protected void Page PreRender object sender  EventArgs e                 List lt Objects User gt  users   Application User GetAllUsers             Repeater1 DataSource   users          Repeater1 DataBind

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