Installing .net 3.5 on Windows 2008 R2

Is there a 开发者_StackOverflow社区way to silently install .net 3.5 on Windows 2008 R2 using the dotNetFx35setup.exe (2.5) meg file and silent mode, or do you alway have to install from Server manager?

Thanks

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Windows 2008 R2 version onwards .NET 3.5.1 is part of windows component which can only be installed via Add/Remove features in server manager. It will not let you install through this installer.