IE get build numer and sub-build number, how to?

Question

Hi!
I try to get IE8 version and Im using:
HttpBrowserCapabilities MyBrowser = HttpContext.Current.Request.Browser;
strMyBrowserVersion = MyBrowser.Version;
And its works fine strMyBrowserVersion value is "8.0", but i need to get "build number" and "sub-build number" also, because i need a string with value: "8.0.7600.16385" somebody can help me?
Im working in Visual Studio 2008 and .NET Framework 3.5
Tanks.