Sorted:

problem about duck-typing-Collection of common programming errors

Using Reflection.Emit to copy a custom attribute to another method-Collection of common programming errors

Objective C – Weak reference to super class?-Collection of common programming errors

problem about implicit-conversion-Collection of common programming errors

Thread safety using OCXs from C# .NET-Collection of common programming errors

Static Binding and Dynamic Binding-Collection of common programming errors

ObjC: using “super” in conjunction with overriding-Collection of common programming errors

Destroying a control fails.-Collection of common programming errors

Is it possible to remove DLL dependency due to interface?-Collection of common programming errors

What is the difference between method hiding and shadowing in C#?-Collection of common programming errors