title: ConfigurationManager Class not exist on .NET 4.5 Framework
body: <p>I just start working with .NET Framework 4.5 of C#. Am using Windows Form Application. I have do the needed imports such as :</p>
  
  <pre><code>using System.Configuration;
  </code></pre>
  
  <p>But actually the ConfigurationManager class seems that it is not exits. I have tried to use ConfigurationSettings instead , but Visual Stdio telling me that it is obsolete and replaced by ConfigurationManager !</p>
  
  <p>This is chunk of code related to the problem :</p>
  
  <pre><code>Int32.Parse StartingMonth = int.parse(ConfigurationManager.AppSettings["StartingMonthColumn"]);
  </code></pre>
  
  <p>So , could you please help me ?</p>