Application error on Page, what i am doing wrong?

I have a basic web forum people fill out and send an e-mail. I have about two dozen of them on the site. One is not working in IE for some reason. It works and sends fine in Firefox, Chrome, Opera etc...

IE error:

Server Error in '/' Application.
--------------------------------------------------------------------------------

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.

Description: An unhandled exception occurred during the execution of the current web   
request. Please review the stack trace for more information about the error and where 
it originated in the code.


Exception Details: System.ArgumentException: 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.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentException: 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 开发者_运维知识库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.] System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +159 System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +108 System.Web.UI.WebControls.DropDownList.LoadPostData(String postDataKey,

NameValueCollection postCollection) +55 System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.LoadPostData(Stri ng postDataKey, NameValueCollection postCollection) +11 System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +353

System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean      
includeStagesAfterAsyncPoint) +1194

Its built in to not accept html or code on an IIS server aspx page.

This is a security risk to add but it will let everything fly to the server.

<%@ Page ValidateRequest="false"

Probably you should encode the data on the client so that it flys to the server safely.

OR

get all data at server'end and then validate there.. Its upto you