HtmlHistory.Back Method (Int32)
Navigates backward in the navigation stack by the specified number of entries.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Argument is not a positive 32-bit integer.
If the number supplied to numBack exceeds the number of previously visited entries in the history, the WebBrowser control will navigate to the first item in the history, for example, to the first Uniform Resource Locator (URL) visited during the current browser session.
If there are no entries behind the current page in the navigation stack, callingwill have no effect, but it will not raise an error.
Available since 2.0