C# WPF WebClient.DownloadString() not returning anything

Question

I started off with the simple code below in order to grab the html from webpages into a string to later process. For some sites like Digikey it works but for others like Mouser it doesn't.

I have tried putting headers and userAgents onto the WebClient along with converting the url to a Uri with no success. Does anybody have any other suggestions of what I could try? Or could anybody try to get the code to work and let me know how it goes?

String url = "http://www.mouser.com/ProductDetail/Vishay-Thin-Film/PCNM2512E1000BST5/? 
qs=sGAEpiMZZMu61qfTUdNhG6MW4lgzyHBgo9k7HJ54G4u10PG6pMa7%252bA%3d%3d"    
WebClient web = new WebClient();
String html = web.DownloadString(url);
MessageBox.Show(html);

EDIT : The link should lead here: link

EDIT : I tried the following chunk of code with no luck:

String url = "http://www.mouser.com/ProductDetail/Vishay-Thin-Film/PCNM2512E1000BST5/? 
qs=sGAEpiMZZMu61qfTUdNhG6MW4lgzyHBgo9k7HJ54G4u10PG6pMa7%252bA%3d%3d"    
WebClient web = new WebClient();
web.Headers[HttpRequestHeader.UserAgent] = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";
String html = web.DownloadString(url);
MessageBox.Show(html);

Answer 1

Need to download Fiddler it's free (was originally developed by Microsoft) and it lets you record browser sessions. So launch it open chrome or whatever your browser is and go though the steps. Once you done you can stop it and look at every request and response and the raw data sent.

Makes it easy to spot the difference between your code and the browser.

There are also many free tools that will take your request/response data and generate the C# code for you such as Request To Code . That is not the only one, I'm not at work and I can't recall the one I use there, but there are plenty to choose from.

Hope this helps