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You can use the following JavaScript code in a web page to determine which versions of .NET are installed on a client PC:

<script language=”JavaScript” type=”text/javascript”>
var a = navigator.userAgent.match(/.NET CLR [0-9.]+/g);
if (a == null)
  document.write( “Microsoft .NET is not installed on your PC” )
else
{
  document.write( “The following versions of Microsoft .NET are installed on your PC:<br/>” )
  for (i = 0; i < a.length; ++i)
  {
     document.write( a[i] )
     document.write( “<br/>” )
  }    
}
</script>

Here is the code in action:

Article published on July 11, 2007

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5 Responses to “Determine Installed .NET Versions from a Web Page”

1. Mr Speaker Says:
   July 11th, 2007 at 7:48 pm

   Great tips ’round here! Keep ’em coming!

2. Tim Yen Says:
   September 1st, 2007 at 9:42 pm

   This jscript doesn’t appear to work on firefox, any ideas why?

3. timm Says:
   March 31st, 2008 at 1:57 pm

   Unfortunately this only works on Internet Explorer. If anyone knows how to make this work on FireFox, please comment!

4. How do I know if I already have .NET? « Says:
   May 18th, 2010 at 12:26 pm

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