How to connect web server through C# Window application

Go the following links for useful info:
http://www.codeproject.com/Articles/26941/Consuming-Webservice-In-A-Windows-Application
http://vbcity.com/forums/t/162076.aspx
Below site is excellent
http://www.codeguru.com/csharp/csharp/cs_webservices/article.php/c19497/Consuming-Asynchronous-Web-Services.htm