ASP.NET 4 Breaking Changes

The ASP.NET 4.0 has been a core update to ASP.NET 2.0. .NET 3.0 and .NET 3.5 were based on .NET 2.0 having additional assemblies only, not the core components. If you have installed all of these frameworks 2.0, 3.0, 3.5, 4.0 and you try to upgrade your ASP.NET 2.0 application, in IIS you will be able to find 2.0 and 4.0 version of the framework only.

Below is the list of the breaking changes in ASP.NET 4.0 that could affect your existing application while upgrading.

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