Cool Player

Нашел крутой плеер

WPF Color Table

Write to appSettings

System.Configuration.Configuration config =   
 ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
config.AppSettings.Settings["LastMsgID"].Value = value.ToString();
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");

WPF & Thread.CurrentPrincipal

так неправильно:

System.Threading.Thread.CurrentPrincipal = [YourPrincipal];

так правильно:

AppDomain.CurrentDomain.SetThreadPrincipal([YourPrincipal]);