appSettings 값 추가하기 , 읽어오기 , 값 존재 유무 체크

* AppConfig 키 값 추가하기

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key ="someKey" value="someValue"/>
  </appSettings>
</configuration>

*AppConfig 키 값 읽어오기 

 

string s = ConfigurationManager.AppSettings["someValue"];
if (!String.IsNullOrEmpty(s))
{
    // Key exists
}
else
{
    // Key doesn't exist
}

참고 Url : http://stackoverflow.com/questions/3295293/c-sharp-assembly-app-settings-how-to-check-if-one-exists