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I'm creating a client insert form, in this form has a <asp:HiddenField/> named Id for save selected client id, but when I try submit form, it is on Page enableEventValidation="true" error, when I rename this HiddenField for any other Id, it's work

<asp:HiddenField runat="server" ID="Id" />
My form can submit success when I set enableEventValidation="false", but maybe I will need it in future
How to can I resolve this problem? keep HiddenField named Id
PrintScreen:
You've pretty much answered your own question. The only way to make this work is set enableEventValidation="false" or rename your HiddenField
Renaming it would be the best solution here, for security reasons
                I've actually created a sample app which has a Hidden field named Id and it doesn't cause any issues. There must be something else causing the issue when combined with this field.
– roryok
                Feb 19, 2014 at 9:25
If you're using framework 4.5 then entry in web.config (requestValidationMode="2.0")
<system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" requestValidationMode="2.0"/>
</system.web>
This might not be the solution for your problem, but i was having same problem and solved it by checking for postback before binding data.
  (!IsPostBack)
  binddata(); //this was my gridview binding function
        
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