title: What cause WebException when consuming Web Service on Windows Mobile 6.5?
body: <p>My application consume a web service but always receive the following expception on first try after the application is started: <strong>System.Net.WebException</strong> with inner exception <strong>System.InvalidOperationException</strong> and <strong>Could not evaluate expression</strong> message. This only occurs for web service and not on HttpWebRequest. Any clue?</p>
  
  <pre><code>
         at System.Web.Services.Protocols.SoapHttpClientProtocol.doInvoke(String methodName, Object[] parameters, WebClientAsyncResult asyncResult)
         at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
         ...
         at System.Windows.Forms.Application.Run(Form fm)
         at Example.Program.Main(String[] args)
  </code></pre>