What is Dynamic Language Runtime (DLR)?
DLR is a runtime environment that permits you to integrate dynamic languages with the Common Language Runtime (CLR) by adding a set of services, like expression trees, call site caching, and dynamic object interoperability to the CLR.
The System. Dynamic and System.Runtime.CompilerServices namespaces are used to hold the classes for DLR. It also gives dynamic features to statically-typed languages, like C# and Visual Basic to enable their interoperation with dynamic languages.