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Invalid postback or callback argument. Event validation is enabled using ''

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生来不讨喜
生来不讨喜 2020-11-22 05:08

I am getting the following error when I post back a page from the client-side. I have JavaScript code that modifies an asp:ListBox on the client side.

How do we fix

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  • 無奈伤痛
    2020-11-22 05:22

    (1) EnableEventValidation="false"...................It does not work for me.

    (2) ClientScript.RegisterForEventValidation....It does not work for me.

    Solution 1:

    Change Button/ImageButton to LinkButton in GridView. It works. (But I like ImageButton)

    Research: Button/ImageButton and LinkButton use different methods to postback

    Original article:

    http://geekswithblogs.net/mahesh/archive/2006/06/27/83264.aspx

    Solution 2:

    In OnInit() , enter the code something like this to set unique ID for Button/ImageButton :

    protected override void OnInit(EventArgs e) {
  foreach (GridViewRow grdRw in gvEvent.Rows) {

  Button deleteButton = (Button)grdRw.Cells[2].Controls[1];

  deleteButton.ID = "btnDelete_" + grdRw.RowIndex.ToString();           
  }
}

    Original Article:

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

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  • 时光取名叫无心
    2020-11-22 05:22

    I implemented a nested grid view and i faced the same problem .I have used LinkButton instead of image button like this:

    before i had a column like this:

    <asp:TemplateField ItemStyle-Width="9">
  <ItemTemplate>
 <asp:ImageButton ID="ImgBtn" ImageUrl="Include/images/gridplus.gif" CommandName="Expand"
                        runat="server" />
  </ItemTemplate>
</asp:TemplateField>

    I have replaced like this.

    <asp:TemplateField>
<ItemTemplate>
     <asp:LinkButton  CommandName="Expand" ID="lnkBtn"  runat="server" ><asp:Image  ID="Img"  runat="server" ImageUrl="~/Images/app/plus.gif" /></asp:LinkButton>
      </ItemTemplate>
</asp:TemplateField>
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  • 眼角桃花
    2020-11-22 05:24

    I had the same problem with a Repeater because I had a web-page with a Repeater control in a web-site which had EnableEventValidation switched on. It wasn't good. I was getting invalid postback related exceptions.

    What worked for me was to set EnableViewState="false" for the Repeater. The advantages are that it is simpler to use, as simple as switching event validation off for the web-site or web-page, but the scope is a lot less than switching event validation off for either.

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  • 小鲜肉
    2020-11-22 05:24

    None of the above worked for me. After more digging I realized I had overlooked 2 forms applied on the page which was causing the issue.

    <body>
<form id="form1" runat="server">
<div>
        <form action="#" method="post" class="form" role="form">
        <div>
        ...
        <asp:Button ID="submitButton" runat="server"
        </div>
</div>
</body>

    Be aware that recently ASP.NET has started considering iframes within a form tag which contains a form tag in the iframe document itself a nested frame. I had to move the iframe out of the form tag to avoid this error.

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  • 栀梦
    2020-11-22 05:24

    3: I changed my button type in grid column from "PushButton" to "LinkButton". It worked! ("ButtonType="LinkButton") I think if you can change your button to other controls like "LinkButton" in other cases, it would work properly.

    I wish I could vote you up, Amir (alas my rep is too low.) I was just having this problem and changing this worked like a champ on my gridview. Just a little aside, I think the valid code is: ButtonType="Link"

    I suspect this is because when you click 'edit', your edit changes to 'update' and 'cancel' which then change back to 'edit' on submit. And these shifting controls make .net uneasy.

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  • 夕颜
    2020-11-22 05:25

    The problem is that ASP.NET does not get to know about this extra or removed listitem. You got an number of options (listed below):

    • Disable eventvalidation (bad idea, because you lose a little of security that come with very little cost).
    • Use ASP.NET Ajax UpdatePanel. (Put the listbox in the Updatepanel and trigger a update, if you add or remove listbox. This way viewstate and related fields get updates and eventvalidation will pass.)
    • Forget client-side and use the classic postback and add or remove the listitems server-side.

    I hope this helps.

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