I have the below method in my dll class library

```
 private void Download(string filename)
    {
     //am calling this value from appconfig
string ftpserverIp = System.Configuration.ConfigurationManager.AppSettings["ServerAddress"];
    //    somecode to download the file
    }

    Private void Upload(string filename)
    {
string ftpserverIp = System.Configuration.ConfigurationManager.AppSettings["ServerAddress"];
    //    somecode to upload the file
    }

```

Like that am getting all the values from appconfig for all my methods,is this any efficient way to call appconfig values ?