Service packs are how Microsoft distributes hotfixes. Service packs keep a product current. Service packs include updates and may include system administration tools, drivers, and additional components. Service packs are conveniently bundled for easy downloading. Service packs are cumulative; each new service pack contains all the fixes that are in previous service packs and any new fixes. You do not have to install a previous service pack before you install the latest one.
This article describes how to obtain Microsoft .NET Framework 1.1 Service Pack 1 (SP1).For more information about how to determine whether a .NET Framework service pack is installed, click the following article number to view the article in the Microsoft Knowledge Base:
318785 Determine whether service packs are installed on the .NET Framework
867460 List of bugs that are fixed in the .NET Framework 1.1 Service Pack 1 (S)