I use WatiN to automate my testing but how could I handle Web Page dialog window? I can connect to it but can't see source code of it.
If you want to handle popup dialog use
ConfirmDialogHandler handler = new ConfirmDialogHandler();
using (new UseDialogOnce(browser.DialogWatcher, handler))
{
browser.Link(Find.ByClass("Your class")).ClickNoWait(); //The action that triggers the dialog
handler.WaitUntilExists(60);
handler.OKButton.Click();
}