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Question 37   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 38   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 39   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.



Question 40   What are types of compatibility in vb6

There are 3 different types of project compatibilities in vb6.

1) no compatibility – in no compatibility setting, whenever an activex object is compiled new guid is created for that. it will cause other components to fail which has a reference to this component.

2) project compatibility – in project compatibility, during the time of development new guid are not created. but after deployment it will work as no compatibility.

3) binary compatibility – in this setting guid’s will not change in recompilation.



Question 41   What is equivalent for regsvr32 exe in .net

Regsvr32.exe is the tool to register dll to the windows registry and regasm.exe is the tool to register a .net assembly



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