c# 4.0 - How to catch HttpRequestValidationException -

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how can redirect user custom error page, when httprequestvalidationexception occurred. tried catch in basecontroller :

protected override void onexception(exceptioncontext exceptioncontext)     {       if (exceptioncontext.exception httprequestvalidationexception)         {           this.view("customerror").executeresult(this.controllercontext);         }     }

but still exception : potentially dangerous request.form value detected client

this exception occurs earlier in execution of request , cannot handled onexceptionmethod in base controller. write global exception handler showed in this post.


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