Visual Studio .NET Beta 2 Service Pack 1 (SP1) is a test release for the English-language releases of Visual Studio .NET Beta 2. The purpose of SP1 is to test the new Visual Studio Update feature. Beta 2 SP1 will replace the VSLOG.DLL file (located in the \Microsoft Visual Studio.NET\Common7\IDE folder), which will signify that the service pack has been applied to your Visual Studio .NET installation.