title: Why WCF cannot be invoked in wcftestclient?
body: <p>I built up a WCF service, it works good in IE addr, but once i add it to wcftestclient and invoke a method, an error was prompted and shown as :</p>
  
  <p>Failed to invoke the service. Possible causes: The service is offline or inaccessible; the client-side configuration does not match the proxy; the existing proxy is invalid. Refer to the stack trace for more detail. You can try to recover by starting a new proxy, restoring to default configuration, or refreshing the service.</p>
  
  <p>Error Details:</p>
  
  <pre><code>The Address property on ChannelFactory.Endpoint was null.  The ChannelFactory's Endpoint must have a valid Address specified.
     at System.ServiceModel.ChannelFactory.CreateEndpointAddress(ServiceEndpoint endpoint)
     at System.ServiceModel.ChannelFactory`1.CreateChannel()
     at System.ServiceModel.ClientBase`1.CreateChannel()
     at System.ServiceModel.ClientBase`1.CreateChannelInternal()
     at System.ServiceModel.ClientBase`1.get_Channel()
     at MyDownloadSvcClient.DeleteMyFolder(Int32 UserId, Int32 FolderId)
  </code></pre>
  
  <p>The config file is: (updated at 10/9)</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;configuration&gt;
      &lt;system.serviceModel&gt;
          &lt;services&gt;
              &lt;service name="MyDownloadSvcClient"&gt;
                  &lt;endpoint binding="basicHttpBinding" /&gt;
              &lt;/service&gt;
          &lt;/services&gt;
          &lt;bindings /&gt;
          &lt;client&gt;
              &lt;endpoint address="http://localhost/MyDownloadSvc.svc"
                  binding="basicHttpBinding" bindingConfiguration="" contract="IMyDownloadSvc"
                  name="Test" /&gt;
          &lt;/client&gt;
      &lt;/system.serviceModel&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p>Is there anything wrong?</p>
  
  <p>Thanks in advance,
  Elaine</p>