title: Connecting user to database with username and password
body: <p>I'm trying to make little app which connect to my database after authorization.
  I make my database, configure ASP.NET make new users etc. then I follow by <a href="http://www.kotancode.com/2010/08/06/aspnet-authentication-wp7/" rel="nofollow">that</a> but at moment I should get link to HelloService error </p>
  
  <pre><code>&gt; "Error  1  'HelloService.HelloService' does not implement interface member'HelloService.IHelloService.GetDataUsingDataContract(HelloService.CompositeType)"
  </code></pre>
  
  <p>I'm just starting with database and WP and I'm little confused. Could You help me?</p>