title: Do we need open db whendb is defined in using?
body: <p>when I use using for connections, I know there is no need to use close or dispose. I wonder, do we need to use open?</p>
  
  <pre><code>using (var dbSqlConnection = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString1"]))
  {             
         dbSqlConnection.Open();  // is this required?
  }
  </code></pre>