Server Error in '/' Application.
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A potentially dangerous Request.QueryString value was detected from the client ( fileid="...ECFBD18418<br />").
Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. You can disable request validation by setting validateRequest=false in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case.
Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.QueryString value was detected from the client ( fileid="...ECFBD18418<br />").