The Microsoft .NET Framework 4.5.1 Release Candidate (RC) Developer Pack is available for Windows Server 2012, Windows Server 2008 R2 Service Pack 1 (SP1), Windows Server 2008 Service Pack 2 (SP2), Windows 8, Windows 7 Service Pack 1 (SP1), and Windows Vista Service Pack 2 (SP2).
The .NET Framework 4.5.1 RC Developer Pack installs the multi-targeting pack for the .NET Framework 4.5.1 RC. Developers can build applications that target the .NET Framework 4.5.1 RC by using either Microsoft Visual Studio 2012 or third-party IDEs.
This package installs the following components:
The .NET Framework 4.5.1 RC
The .NET Framework 4.5.1 RC Multi-Targeting Pack: Contains the reference assemblies that are required to build apps that target the .NET Framework 4.5.1
The .NET Framework 4.5.1 RC Language Packs
The .NET Framework 4.5.1 RC Multi-Targeting Pack Language Packs: Contain the IntelliSense files that help to build apps that target the .NET Framework 4.5.1 RC through Visual Studio 2012 and third-party IDEs.
Note If you intend to redistribute the .NET Framework 4.5.1 RC, you should use the Web Installer package instead of this package. To obtain the Web Installer package, go to the following Microsoft Download Center website:
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
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What’s new in the .NET Framework 4.5.1 RC?
The .NET Framework 4.5.1 RC supports the writing of code in C#, Visual Basic, and F# programming languages, and includes these significant language and framework enhancements:
Better performance and reliability
ASP.NET application suspend and resume
On-demand compaction of the large object heap
64-bit Edit and Continue
Activity tracing and sampling
SQL connection resiliency
Managed return values
For more information about these and other features of the .NET Framework 4.5.1, see the .NET Framework Developer Center website and blog post. This version of the .NET Framework runs side-by-side with the Microsoft .NET Framework 3.5 Service Pack 1 (SP1) and earlier versions, but performs an in-place update for the .NET Framework 4 and the .NET Framework 4.5.
Command-line switches for this update
For more information about the various command-line switches that are supported by this update, see the "Command-Line options" section of the following MSDN website:
You may have to restart the computer after you install this software if any affected files are being used. We recommend that you close all applications that are using the .NET Framework before you apply this update.