title: SQL Server: by default how long connection stays open if I forget to close it
body: <p>Suppose</p>
  
  <pre><code>SqlDataReader oDR = ...
  ...
  oDR.Read()
  ...
  
  forgot to close!
  </code></pre>
  
  <p>Question: for how long connection will stay open by default? Can I change this?</p>