How use javascript in web site designed by c#

<script type="text/javascript"> 
txt = "Browser CodeName: " + navigator.appCodeName; 
txt+= "Browser Name: " + navigator.appName; 
txt+= "Browser Version: " + navigator.appVersion; 
txt+= "Cookies Enabled: " + navigator.cookieEnabled; 
txt+= "Platform: " + navigator.platform; 
txt+= "User-agent header: " + navigator.userAgent; 
document.getElementById("example").innerHTML=txt;
</script>