The following sections describe deployment improvements. For additional information and known migration issues, visit the. NET Framework 4 Application Compatibility topic and learn about new features by using the Visual Studio 2010 and. You can test compatibility as described in the. NET Framework 4 is installed, please submit a bug on the Microsoft Connect Web site.
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.
