All .NET code have to be CLS compliant

False: There is facility to add 'unmanaged' code in C# which need not be CLS compliant.

The answer is A). As far as i know, CLR control only the managed code. But .NET supports to do a communication with unmanaged code. But all the code that runs within .NET is managed code.Managed codes are CLS complient because they are written in either of the .NET complient language.Let me know if i am wrong on vishal.joshi1@gmail.com.Thanks,Vishal.

this article in MSDN http://msdn2.microsoft.com/en-us/library/bhc3fa7f(VS.80).aspx says"You can mark assemblies, modules, types, and members as either CLS-compliant or not CLS compliant using the CLSCompliantAttribute."

A. True

The .NET Framework provides a run-time environment called the common language runtime.

False

All .Net code need not be CLS compliant if you are going to write all modules using single .Net language. However, if you are going to use different .Net language for different modules then you have to mark the public functions as CLS-compliant otherwise you can use full feature of a .NET language( like C#, VB.NET) without being CLS compliant.

Not required. If you want your code to be CLS complaint use the annotation CLScompliant(true)