Retrieve application settings

RetrieveAppSettings.cs

//Credit goes to this blog post https://dotnettips.wordpress.com/2013/03/07/retrieving-application-settings/
//USAGE: int serverPort = GetAppSetting<int>("server_port");
public static T GetAppSetting<T>(string key)
{
   if (ConfigurationManager.AppSettings.AllKeys.Contains(key))
   {
      return (T)System.Convert.ChangeType(ConfigurationManager.AppSettings[key], 
                                        typeof(T), CultureInfo.InvariantCulture);
   }
   else
   {
      return default(T);
   }
}