Web Forms :: ScriptResource.axd PageRequestManagerServerErrorException (Server Error 500)?

Mar 29, 2011

When I have a string in a textbox starting with a < sign, it causes server error 500 during post back. Is this a known issue?

Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500
Line: 604
Char: 13
Code: 0
URI: http://.../ScriptResource.axd?d=.....

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*Update: *
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Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: 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

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protected void gvAssociatedUsers_RowDataBound(object sender, GridViewRowEventArgs e)
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<add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" validate="false" />

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