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Question 37   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 38   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 39   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

Question 40   What is dcom

Docm stands for distributed component object model. dcom was used to make a remote procedure call in a server from a client machine. dcom uses tcp/ip and http protocol to communicate.

Question 41   How many types of transactions are there in com + .net

Com+ supports five different types of transactions.

1) not supported
2) disabled
3) supported
4) required
5) required new

Question 42   How do you do object pooling in .net

In object pooling, objects are kept in a pool of memory which is be later used when required rather than creating it again. object pooling will be used to improve the performance in some scenarios where the creation of an object is an overhead. a factory pattern cab be used to achieve object pooling.

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