====== Configuration File ======
  * for windows application we usually use //app.config//, for web application //web.config//

=== Get Connection String ===

<code csharp>
var connStr = ConfigurationManager.ConnectionStrings["MyConnStr"].ConnectionString;

</code>

=== Get App Settings ===
<code csharp>
var settings = ConfigurationSettings.AppSettings["Mykey"];
</code>