title: why I can't set nothing to variable in vb.net?
body: <p>I have a a problem with my vb.net.</p>
  
  <p>my code</p>
  
  <pre><code>class business{
      buiding as string
  }
  </code></pre>
  
  <p>I load data from mongodb</p>
  
  <pre><code>Dim collection1 = db1.GetCollection(Of business)("tablebusiness")
  Dim list = collection1.Find(query1)
  For Each abiz In list
       Dim biztemp = abiz
       biztemp.buiding = nothing '//// (but I get biztemp.building = "") why??
       'biztemp.building = "" here
  Next
  </code></pre>