[Solved] ASP.Net Error: Invalid postback or callback argument. Event validation is enabled

indradeo

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User: indradeo
Posted: on Nov 02, 2020 11:17 PM
Forum: ASP.Net Web Forms
Answer: 1
Views: 15665

how to remove mention error.

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.

<%@ Page Language="C#" AutoEventWireup="true" Codefile="WebForm1.aspx.cs"  Inherits="sfty_Lead_lag.WebForm1" %>
<link href="jquery-ui-1.12.1.custom/jquery-ui.min.css" rel="stylesheet" />

<!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">

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dharmend...

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User: dharmendr
Replied: on Nov 02, 2020 11:17 PM
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indradeo says:

<%@ Page Language="C#" AutoEventWireup="true" Codefile="WebForm1.aspx.cs"  Inherits="sfty_Lead_lag.WebForm1" %>

Change above line with below.

<%@ Page Language="C#" AutoEventWireup="true" Codefile="WebForm1.aspx.cs"  Inherits="sfty_Lead_lag.WebForm1" EnableEventValidation="false"%>

You need to set the EnableEventValidation to false in the page.

Refer below links.

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[Solved] ASP.Net Error: Invalid postback or callback argument. Event validation is enabled

RegisterForEventValidation can only be called during Render()

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