If your application or component does not work after. NET Framework version specified in the properties for your project in Visual Studio, or you can specify the supported runtime with the Element in an application configuration file. NET Framework 4, you must compile your application with the target. NET Framework 4 does not automatically use its version of the common language runtime to run applications that are built with earlier versions of the .NET Framework. NET Framework versions, except for some changes that were made to improve security, standards compliance, correctness, reliability, and performance. NET Framework 4 is highly compatible with applications that are built with earlier. More information about the issue can be found Microsoft Security Advisory 2749655.The. NET 4.5 redistributable package dated install this updated.

We recommend customers that previously installed the. NET Framework 4.5 redistributable was updated on to correct an issue related to an improper timestamp on a digital certificate which causes the digital signature on files produced and signed by Microsoft to expire prematurely.

NET Framework 4.5 delivers better performance, reliability, and security.įor more information about these and other features of the.

NET Framework 4.5 adds substantial improvements to other functional areas such as ASP.NET, Managed Extensibility Framework, Windows Communication Foundation, Windows Workflow Foundation, and Windows Identity Foundation. NET Framework 4.5 includes significant language and framework enhancements for C#, Visual Basic, and F# (so that you can more easily write asynchronous code), the blending of control flow in synchronous code, a responsive UI, and web app scalability.

NET Framework 4.5 together with the C#, Visual Basic, or F# programming language, you can write Windows apps. NET Framework 4.5 is a highly compatible, in-place update to the.

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