Many times i got this error in my previous project. So, i search on google to solve this problem and i found one solution. If you have this error then you can check this
You can solve this problem with following ways :
you can also add the <pages validateRequest=”false”> in page directive of each and every page.
With .Net 4 this doesnt seem to work alone. You need to put the ValidateRequest=”false” on Page directive. Also on your web.config put this<system.web><httpRuntime requestValidationMode=”2.0″ /></system.web>
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