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Question 31   What is codedom

Codedom which stands for code document object model is an object model which is used to develop language independent source code. once developed codedom can be converted to any .net language.
codedom is mainly used for template code generation and dynamic code compilation



Question 32   How can we make windows api calls in .net

In .net windows api calls can be invoked using platform invoke services which is also known as pinvoke.




Question 33   Windows api in .net is unmanaged code or managed code.

Windows api calls are executed by the operating system directly which are outside the control of clr. so they are unmanaged code in .net.



Question 34   What is com

Com stands for component object model. it is a binary programing standard. com was used earlier to create re-usable software components before the .net era. a com can be compared to a wbservice in .net



Question 35   What is reference counting in com

Reference counting is a mechanism to count how many times an object has a pointer referring it. it is basically used by the garbage collector algorithm to check whether an object is dead or alive. when an object is created reference count is set to one and will be incremented each time it is referred. the same will be decremented when set to null. garbage collector will deallocate the memory of objects whose reference count is zero



Question 36   What is iuknown interface

Iuknown is an interface used in component object model (com). every com object should implement this interface. iuknown interface contains three methods

1) queryinterface
2) addref
3) release




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