C# Windows Store WebView get user-agent -

is there way extract user-agent string webview control uses? if so, appreciate if can give me method so. using following not seem work:

        var useragent = new stringbuilder(256);         int length = 0;         urlmkgetsessionoption(urlmonoptionuseragent, useragent, useragent.capacity - 1, ref length, 0); 

i take back, using urlmkgetsessionoption mentioned in code above work.