All About WatiN

http://watin.sourceforge.net/htmlelementmapping.html

Get a RadioButton

ie.RadioButton(Find.ByName("rdoSendInfo_0")

Click a Button:

ie.Button(Find.ById("btnInitialize")).Click();

Click a LinkButton:

ie.Link(Find.ById("LinkButton1")).Click();

Type in a TextBox:

ie.TextField(Find.ByName("q")).TypeText("WatiN");