How to detect what .NET Framework X service pack is installed

Hi,

Today I needed to find which versions+SP were installed, so this maybe helpful for anyone else:

Lookup in the registry:

• KeyName:  HKEY_LOCAL_MACHINE\Software\Microsoft\NET Framework Setup\NDP and .NET Version http://support.microsoft.com/default.aspx?kbid=318785
• Value (DataType REG_DWORD): SP

Cheers!