How to connect a web service to a  WPF Browser Application?

Could someone please tell me how to connect a WPF Browser Application to a web service.  I am trying to do this in .NET 3.0.  In a .Net 2.0 Web Site  I would connect to a web service by using the following C# code:

WebReference.ViewWebServiceInfo wsInfo;
WebReference.ViewWebService wsView = new WebReference.ViewWebService();
wsInfo = wsView .ViewAll();

When I try to do this in 3.0 in a WPF Browser Application , I get this error:

System.Security.SecurityException was unhandled by user code
  Message="Request for the permission of type 'System.Net.WebPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=xxxxxxx' failed."
  Source="mscorlib"

Can anyone tell me what I am doing wrong, or show me some sample code of how to connect to a web service in WPF Browser Application .Net 3.0.  Thanks for your help.
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