I tried this code
WebClient wc = new WebClient(); wc.Proxy = null;
but I get System.Net.Webclient does not contain definition for proxy
System.Net.WebClient does not contain a definition for proxy.
If you check MSDN you see that the webclient does not have a property named Proxy.
If you check the MSDN page for the normal webclient (non-Silverlight/non-phone) version you see the Proxy property. But that is not included in the stripped down version for the windows phone, because in your Phone you cant set a proxy.
So no need to set it to null. Since the property doesn't exist. Just remove that line.