CODE EXAMPLE FOR CSHARP

how to do Employing defensive code in the UI to ensure that the current frame is the most top level window

<system.webServer>
  ...
  <httpProtocol>
    <customHeaders>
      <add name="X-Frame-Options" value="SAMEORIGIN" />
    </customHeaders>
  </httpProtocol>
  ...
</system.webServer>