title: The type or namespace name 'commonlib' could not be found
body: <p>my error is</p>
  
  <p>The type or namespace name 'commonlib' could not be found (are you missing a using directive or an assembly reference?)</p>
  
  <p>commonlib.DBManager DM = new commonlib.DBManager(   ConfigurationManager.ConnectionStrings["Data Source=PERFORMA-18ACD7;Initial Catalog=silk1;Integrated Security=True"].ConnectionString);</p>