Call webservice with basic auth

var srv = new SalersService();
srv.Credentials = new NetworkCredential("[user]", "[pass]");
...

Call webservice via proxy

var srv = new SalersService();
var proxy = new WebProxy("[url]", [port]);
proxy.Credentials = new NetworkCredential("[user]", "[pass]", "[domain]");
srv.Proxy = proxy;
...

Кириллица в куках

Можно использовать UrlEncode, UrlDecode:

var cookie = new HttpCookie("user", Server.UrlEncode(name));
...
var name = Server.UrlDecode(cookie.Value);

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]);