AJAX Exception

Folks,
I am developing a ASP.Net application. I have extensively used AJAX in my development. Frequently, when I submit a form which generates a pdf dynamically based on the form contents submitted, I get the error:
Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500

I tried reinstalling AJAX but it did not help.

Please help
Eric_ShugartsAsked:
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skiltzCommented:
<%@ Page Language="C#" MasterPageFile="~/Admin/MasterPage_Admin.master" AutoEventWireup="true" CodeFile="CategoryManagement.aspx.cs" Inherits="Admin_CategoryManagement" Title="Untitled Page" EnableEventValidation="false" %>

Just disable EventValidation like above
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Eric_ShugartsAuthor Commented:
thanks
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sgidmanCommented:
I solved it myself in the end the webconfig file must contain the line

<httpRuntime maxRequestLength="100000" requestValidationMode="2.0"/>
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