http://blogs.msdn.com/b/wsdevsol/archive/2012/12/13/why-can-t-i-set-cookies-in-webview-when-using-navigatetostring.aspxThe title says it all and we have seen some forum and support cases about this subject. I have a workaround for you though! Background When programming with WebView you can use NavigateToString to populate a HTML and JavaScript and if that JavaScripten-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)