Dot Net Framework 3.5/4.0/4.5

.Net framework is an integrated component of windows operating system that supports development and execution of next generation applications, Windows store apps and services. .NET Framework 4.5 at its core consists of Common Language Runtime (CLR), Dynamic Language Runtime (DLR), Base Class Library (BCL), Portable Class Library, Parallel Extension and WinRT. With .Net Framework 4.0 there are various new additions in BCL which includes DLR, MEF, Parallel Extension, Entity Framework, WCF Data Services and ability to host .NET 4 runtime with .NET 3.5, 3.0, 2.0 runtimes side by side under the same hosting process.