A few years back I wrote a post on the size of the .NET Framework . There's historically been a lot of confusion on the site of the .NET Framework. If you search around on the web for ".NET Framework" or ".NET Framework Redistributable"
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Read the complete post at http://feedproxy.google.com/~r/ScottHanselman/~3/fHEl4oH4Arc/SmallestDotNetUpdateNowWithNET4SupportAndAnIncludableJavaScriptAPI.aspx