Error while binding data to asp dropdownlist with Json

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Hi I am getting this error while using Dropdown binding with Json am using EnableEventValidation="true" and i also check with scriptmanager stiil am getting same error as follows

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.

This is my aspx code

ASP.NET

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Dropdown with JSON.aspx.cs"  Inherits="Dropdown_with_JSON" EnableEventValidation="true"  %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.8.2.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $.ajax({
                type: "POST",
                contentType: "application/json; charset=utf-8",
                url: "Jquery.asmx/BindDropdown",
                data: "{}",
                dataType: "json",
                success: function (data) {
                    $("#DropDownList1").append($("<option></option>").val("").html("srre"));
                    $.each(data.d, function (key, value) {
                        $("#DropDownList1").append('<option value="' + value.CategoryID+ '">' + value.CategoryName + '</option>');
                    });
                },
                error: function (result) {
                    alert("Error");
                }
            });
       
    });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
       
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <br />
        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true">
        </asp:DropDownList>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
            ControlToValidate="DropDownList1" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
        <br />
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
       
    </div>
    </form>
</body>
</html>

Posted 7-Nov-12 23:46pm

Traybabu

Updated 7-Nov-12 23:55pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v2

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Comments

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 8-Nov-12 6:17am

Can't you set Page EnableEventValidation to false and try once ?

Traybabu 8-Nov-12 6:19am

if I put EnableEventValidation=false my button clcik event not firing.........

Ravi Tuvar 16-Nov-12 7:12am

have you tried to debug this in Firebug..is is going into success code? or getting any error?

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