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

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>

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

Protected Sub Application_BeginRequest(sender As [Object], e As EventArgs)
  Response.Headers.Remove("X-Frame-Options")
  Response.AddHeader("X-Frame-Options", "DENY")
 End Sub