title: SFService is a 'namespace' but is used like a type
body: <p>I'm trying to accomplishing a simple task of validating a SessionID (that I already have) through the SOAP API of SalesForce. Problem is, all the examples I found on internet is like this: </p>
  
  <p><code>SforceService binding = new SforceService();</code></p>
  
  <p><code>binding.Url = serverUrl;</code></p>
  
  <p><code>binding.SessionHeaderValue = new SessionHeader();</code>
  <code>binding.SessionHeaderValue.sessionId = sessionId;</code></p>
  
  <p>but for the very first line doesn't work for me, I've added the web reference through Visual Studio and WSDL file that I've downloaded through my account on salesforce. but SforceService is a namespace that can't be instantiated.</p>
  
  <p>this is how my Solution Explorer looks like after adding the reference:
  <img src="https://i.stack.imgur.com/dFfo4.png" alt="enter image description here"></p>
  
  <p>All I want to is to validate a SessionID!! </p>
  
  <p>Any idea?</p>