title: XPath select node with namespace
body: <p>Its a .vbproj and looks like this</p>
  
  <pre><code>&lt;Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"&gt;
      &lt;PropertyGroup&gt;
          &lt;ProjectGuid&gt;15a7ee82-9020-4fda-a7fb-85a61664692d&lt;/ProjectGuid&gt;
  </code></pre>
  
  <p>all i want to get is the ProjectGuid but it does not work when a namespace is there...</p>
  
  <pre><code> Dim xmlDoc As New XmlDocument()
   Dim filePath As String = Path.Combine(mDirectory, name + "\" + name + ".vbproj")
   xmlDoc.Load(filePath)
   Dim value As Object = xmlDoc.SelectNodes("/Project/PropertyGroup/ProjectGuid")
  </code></pre>
  
  <p>what can i do to fix this?</p>