The DLR extended the CLR to better support dynamic languages like IronPython and IronRuby. It introduced the dynamic keyword in C#, allowing type checking to be deferred until runtime. C. Language Improvements (C# and VB)
MSDN documentation, journal articles, Microsoft white papers. net net framework 4.0
A massive library of reusable code (classes, interfaces, and value types) that simplifies development. Key Aspects: The DLR extended the CLR to better support
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The engine that executes applications, providing memory management, security, and debugging. providing memory management
about .NET 4.0