출처 :&nbsp;<a href="http://blog.kgoon.net/4" target="_blank" class="tx-link">http://blog.kgoon.net/4</a> 아래 소스를 사용하기 전에 우선적으로 참조에 System.Configuration을 추가한다. using
System.Configuration;&nbsp;public class AppConfiguration{&nbsp;&nbsp;&nbsp;
public static string GetAppConfig(string key)&nbsp;&nbsp;&nbsp;
{&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return ConfigurationManager.AppSettings[key];&nbsp;&nbsp;&nbsp;
}&nbsp;&nbsp;&nbsp;&nbsp;
public static void SetAppConfig(string key, string value)&nbsp;&nbsp;&nbsp;
{&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
KeyValueConfigurationCollection cfgCollection =
config.AppSettings.Settings;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
cfgCollection.Remove(key);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
cfgCollection.Add(key, value);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
config.Save(ConfigurationSaveMode.Modified);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ConfigurationManager.RefreshSection(config.AppSettings.SectionInformation.Name);&nbsp;&nbsp;&nbsp;
}&nbsp;&nbsp;&nbsp;&nbsp;
public static void AddAppConfig(string key, string value)&nbsp;&nbsp;&nbsp;
{&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
KeyValueConfigurationCollection cfgCollection = config.AppSettings.Settings;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
cfgCollection.Add(key, value);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
config.Save(ConfigurationSaveMode.Modified);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ConfigurationManager.RefreshSection(config.AppSettings.SectionInformation.Name);&nbsp;&nbsp;&nbsp;
}&nbsp;&nbsp;&nbsp;&nbsp;
public static void RemoveAppConfig(string key)&nbsp;&nbsp;&nbsp;
{&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
KeyValueConfigurationCollection cfgCollection =
config.AppSettings.Settings;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
try&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
{&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cfgCollection.Remove(key);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;config.Save(ConfigurationSaveMode.Modified);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ConfigurationManager.RefreshSection(config.AppSettings.SectionInformation.Name);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
catch { }&nbsp;&nbsp;&nbsp;
}



























































































}

app.config 사용하기 [System.Configuration]