Showing and getting different domain site as iframe in ASP.NET

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VB

ASP.NET

Javascript

C#7.0

Hi Guys ,
my issue is started when my company decided to offer for all employees to prepare for Microsoft digital literacy Exam , my problem that I need to save all employees result into sql server database.
Exam link is : Digital Litercy Exam

that is a free exam from microsoft , I found that the best way to do it via html Iframe , I couldn't capture innerhtml for that iframe .

please help me in Iframe or any alternative way ..

PS: I need to get that last page result only which it has different address .

What I have tried:

I tried this:

<pre>/ <iframe id="myFrame"       src="https://www.microsoft.com/about/corporatecitizenship/citizenship/giving/programs/up/digitalliteracy/asmt/assessment.aspx?lang=eng&amp;aid=as26b" width="100%" height="800"></iframe>

and

<pre>      <script type ="text/javascript" >

          document.getElementById('myFrame').onload = myFunction();

          function myFunction()
          {

              var y = document.getElementById('myFrame').contentWindow.document.body.innerHTM;
              document.getElementById('txt1').value = y;
          }

      </script>

what i missed !!

Thanks a gain :)