Http WebRequest/Response not working with proxy settings

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Hi All,

I am working on a application which needs to detect internet and download some files from server. I am using http webrequest/response logic for internet detect logic. It is working fine but fails if tried on network which has proxy server in place.

I am on a corporate network and the request has to go through the proxy. To overcome this I used the below logic after searching in google.

HttpWebRequest webRequest =
(HttpWebRequest) (WebRequest.Create("http://www.google.com"));
IWebProxy proxy = WebRequest.GetSystemWebProxy();
proxy.Credentials = CredentialCache.DefaultNetworkCredentials;
webRequest.Proxy = proxy;

HttpWebResponse webResponse =(HttpWebResponse) (webRequest.GetResponse());

With this it started working but has dependency on the following settings in IE->Connections->LAN Settings

1) Automatically detect settings
2) Use automatic configuration script

Both these options needs to be selected for the above logic to work. But I am able to browse internet if I have just the 2nd option (Use automatic configuration script) selected which points to a valid script. So, my expectaion is the logic should also work, if just this option is selected. But it gives the below exception

The remote name could not be resolved: 'www.google.com'

However, if both option 1 and 2 are selected in IE LAN settings, then the above logic works fine.

Please help me understand the reason for this behavior and how to solve.

Thanks in advance.