Invalid postback or callback argument..

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Hi I am using grid view to populate data from database, but when I click next page button of grid view I am getting following 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.

I saw somewhere to add following line to aspx page

<%@ Page EnableEventValidation="false" %>
when I used it, it gives another exception
The directive 'Page' is unknown

Posted 3-Oct-13 3:31am

Imadoddin

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saguptamca 3-Oct-13 10:11am

What is clientidmode of gridview

[no name] 4-Oct-13 0:52am

I didn't assigned any clientmode, should I assign it? What should be the value? thanks

idenizeni 3-Oct-13 12:40pm

The @ Page directive should go in a page (.ascx) and not a control (.ascx). Also, if you are only trying navigate pages in the gridview then I don't believe you want to set EnableEventValidation to true.

[no name] 4-Oct-13 0:55am

Yup, it should be false, but I am treating .ascx control as a page here. Any better idea?

idenizeni 4-Oct-13 1:54am

You can 'treat' the .ascx control as a page all you want but the ASP.Net framework will never agree with you. If you really want this to work you need to put the @ Page directive in the .aspx page that you are loading the .ascx control into.

[no name] 4-Oct-13 2:19am

Its solved sir, thank you for ur help :)

idenizeni 4-Oct-13 2:55am

You're welcome :)

Azee 3-Oct-13 12:42pm

Could you please post your code as well?

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Ajay_Saini · Answer 1 · 2013-10-03T06:52:00

Solution 1

Hi you should use <%@ Page EnableEventValidation="true" %> not false is page directive

Posted 3-Oct-13 6:52am

Ajay_Saini

Comments

[no name] 4-Oct-13 0:42am

when I used @page, it gives another exception
The directive 'Page' is unknown

[no name] 4-Oct-13 0:44am

And it is ascx not aspx, so I guess that is the reson for The directive 'Page' is unknown exception