Invalid postback or callback argument. Event validation is enabled using in configuration or in a page.

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Hi Everyone,

Getting this following error on button click. I have a page with Dropdownlist and a button.
I'm binding the countrylist from DB to dropdownlist using Jquery's ajax method. Now when i click on button to store the selected country in some other table, raising this below error.
I have tried with the enableEventValidation="false", but not getting the selected values from the dropdown.

any idea?

Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> 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.

XML

[ArgumentException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> 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) +8644649
   System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +69
   System.Web.UI.WebControls.DropDownList.LoadPostData(String postDataKey, NameValueCollection postCollection) +53
   System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +13
   System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +343
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1743

Posted 24-Jul-13 1:30am

Rockstar_

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Comments

Kornfeld Eliyahu Peter 24-Jul-13 7:36am

1. In general when you do not set control ids you may get this error
2. Client side changes may trigger also
3. I may able to help you if you let me see your code...

Rockstar_ 24-Jul-13 7:42am

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DDLFillWithJSON.aspx.cs" Inherits="JSON_DDLFillWithJSON" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="../Scripts/jquery-2.0.2.js"></script>
<script type="text/javascript">

$(document).ready(function () {
debugger;
getCountryList();
// $('#ddlCountry').html();

});

function getCountryList() {
$.ajax({

url: "DDLFillWithJSON.aspx/GetCountryList",
type: "GET",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: onSuccess,
error: geterror,
failure: function (response) { alert(response.d); },
async: false

});
}

function onSuccess(response) {
debugger;
var myobject = eval(response.d);
BuildList(myobject);
}

function BuildList(msg) {
debugger;
var select = '';
for (var i = 0; i < msg.length; i++) {
select += '<option value=' + msg[i].MId + '>' + msg[i].MasterName + '</option>' + ''
}
var newselect = select;
$('#ddlCountry').html(select);
return false;
}

function geterror(xhr, ajaxOptions, thrownError) {
alert(xhr.status + '</br>' + xhr.responseText + '</br>' + thrownError);
}

</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
<asp:UpdatePanel runat="server" ID="upd" UpdateMode="Always">
<contenttemplate>
<asp:DropDownList runat="server" ID="ddlCountry">

<asp:Button Text="Click Me" runat="server" ID="btnClickMe" OnClick="btnClickMe_Click" />

</div>
</form>
</body>
</html>

Rockstar_ 24-Jul-13 7:42am

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Services;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class JSON_DDLFillWithJSON : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

[System.Web.Services.WebMethod]
[ScriptMethod(UseHttpGet = true)]
public static string GetCountryList()
{
Connection cnn = new Connection();
return cnn.Get_CountryList();

}
protected void btnClickMe_Click(object sender, EventArgs e)
{
var cname= ddlCountry.SelectedItem;
var cMid = ddlCountry.SelectedItem;
}

protected override void Render(HtmlTextWriter writer)
{
ClientScript.RegisterForEventValidation(btnClickMe.UniqueID.ToString());
base.Render(writer);
}
}

ZurdoDev 24-Jul-13 8:08am

If you have special characters in your data when it posts back .net flags it as being potentially dangerous.

Rockstar_ 24-Jul-13 23:40pm

No special chars in the data

ZurdoDev 25-Jul-13 7:43am

Something is triggering that error.

Kornfeld Eliyahu Peter 24-Jul-13 9:48am

The problem is that you mixing server side and client side initialization.
The EnableEventValidation gives you some security about the values you can get from the client.
In your case there is no other solution but set it false, however in this case you must implement some kind of security check to see that the value returns form the ddl does not contains some code injection...
If - by design - you mean to use web services to obtain data it should be better to save them also using the same web service.
If it not mandatory to use web services in the way you did, use solid server side initialization and EnableEventValidation will give you some security for free...

Rockstar_ 24-Jul-13 23:41pm

When i put enableEventValidatation to false, then the button click event is firing ,but the ddl's selecteditem/index/value's are coming null.

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Sandeep Singh Shekhawat · Answer 1 · 2014-01-31T19:16:00

Solution 1

check this thread...

Invalid call back and post back problem[^]

http://www.c-sharpcorner.com/Forums/Thread/35301/[^]

Posted 31-Jan-14 19:16pm

Sandeep Singh Shekhawat

Updated 31-Jan-14 19:18pm

v2