摘要:WebRequest
How to mimic a button click within a web page (如何模擬點擊button)
http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/0d33e2f4-f9f7-4174-8dc3-6ee2fb8130e4
Pressing button on a web page form?
http://social.msdn.microsoft.com/forums/en-US/vbgeneral/thread/b607e5b9-30ae-4273-972b-b755ac37de1e/
MSDN 中文逐步說明
http://msdn.microsoft.com/zh-tw/library/debx8sh9(v=vs.80).aspx