How to block different extension files accessed by unauthorized user before Login

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Web.config


<system.web>
               <!--Secure ASP.NET cookies-->
<httpCookies httpOnlyCookies="true" requireSSL="true" lockItem="true" />
<!—Extension files block for unauthorized user access-->
<httpHandlers>
      <add verb="*" path="*.txt" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.pdf" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.jpg" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.gif" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.png" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.ico" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.xls" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.xlsx" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.csv" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.doc" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.docx" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.cab" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.htm" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.log" type="WebHandlers.Handler,WebHandlers"/>
      <add verb="*" path="*.xml" type="WebHandlers.Handler,WebHandlers"/>
</httpHandlers>
<system.web>


Type of file extension added to block before login


*.jpg, *.txt, *.xls, *.xlsx, *.png, *.gif, *.pdf, *.doc, *.docx


*.csv, *.ico, *.cab,*.htm, *.log, *.xml






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