While investigating this question I got curious about how the new covariance/contravariance features in C# 4.0 will affect it. In Beta 1, C# seems to disagree with the CLR. Back in C# 3.0, if you ...

In Common Language Runtime (CLR) Microsoft page, it says that both .Net Framework 4 and 4.5 uses the CLR version 4. However in this page (.NET Framework Versions and Dependencies) it writes '.Net F...

Suppose I have the following code: var X = XElement.Parse (@" <ROOT> <MUL v='2' /> <MUL v='3' /> </ROOT> "); Enumerable.Range (1, 100) .Select (s => X.Elements () ...

I'm not 100% clear on how an instance of class A can be defined to exist until after the last instance of class B is finalized. Or in other words, I'd like all B's to call close&dispose method...

As I understand it there's a 2 GB limit on single instances in .NET. I haven't paid a lot of attention to that since I have mainly worked on 32 bit OS so far. On 32 but it is more or less an artifi...

In C# 4, the behavior of types without the beforefieldinit flag was changed, so now a type initializer can call before first use of any static field of the class. My questions are why has the C#/...

When using the typeof operator on type created through TypeBuilder, the operator will return null. I'm curious why this happens and how to prevent it. I'm starting to think this is a VS bug in ...

Recently I was running the example provided by Andrew Hunter on his blog "The Dangers of the Large Object Heap" compiled against .NET 4 and I got the following numbers: With large blocks: 622Mb ...

My colleague mentioned that there are some major improvements in CLR 4.0 related to Event Tracing for Windows but I couldn't find details of what exactly is new. There are few blog posts that menti...

The .NET Framework 4.0 introduces several items to the Reflection API that range from extremely useful to vital for my work. Among these are protected constructors for Assembly, Module, MethodBody,...

I'm working on a .NET 4 project, and would be able to benefit from the dynamic property access that HyperDescriptor provides, but it doesn't seem to be working properly when built in .NET 4. I down...

I know that the logic for GC to trigger is not simple but it has certain thresholds to monitor. Anyone knows what are these thresholds could be for .NET 4 workstation and server GC ? Thank you

For my current project, we're using some CLR 2 based mixed mode assemblies. In order to use these from within a .NET 4 targetted assembly, I know you have to add useLegacyV2RuntimeActivationPolicy...