A potentially dangerous Request.QueryString value was detected from the client (callingContext="...List.aspx?alert('3242'...").

Hi,

I am using visual studio 2010 but my target framwork is 3.5.I am working on XXScripting prevention.when i add <script>alert('234')<script> to any url then i am getting this type of error.I used 

<pagesvalidateRequest="false"/>

<httpRuntimerequestValidationMode="2.0"/> both of this but its is not working with framework 3.5.Please any body help me what should i use instead of this two for framwork 3.5 with VS 2010.