Sorted:

C# – Casting an object to an interface-Collection of common programming errors

Thread is writing on desktop-Collection of common programming errors

Is optimization dangerous? [closed]-Collection of common programming errors

Polymorphism – Define In Just Two Sentences-Collection of common programming errors

Multiple Method Signatures For A Single Abstract Function/Abstract Overloading-Collection of common programming errors

C++ array of derived class vs array of pointers of base class to derived objects – why is amount of memory allocated so much different?-Collection of common programming errors

if main method completes the execution, what happens to any long running thread?-Collection of common programming errors

Making own taskbar with MenuStrip in a form-Collection of common programming errors

Prioritized queues in Task Parallel Library-Collection of common programming errors

Is Windows' rand_s thread-safe?-Collection of common programming errors