Can a DataReader persist data ?

No.

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Which is faster among DataSet and DataReader ? Why ?

DataReader is faster as it has only one record at a time, and Dataset is slower as it fetches the entire table or set of tables.

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What's use of "DataView" ?

It is used for sorting and finding data with in DataTable. .

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What is the name of the method which reverts changes made to the DataSet?

The Method which is called to save the changes in a DataSet is,
RejectChanges().

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What is the name of the Method which is called to save the changes in a DataSet ?

The Method which is called to save the changes in a DataSet is,
AcceptChanges().

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Can we have multiple threads in one App domain ?

Yes.

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What are two different types of remote object creation mode in .NET ?

Object can be created using Remoting in two different ways , they are :
1. SAO (Server Activated Objects)
It is also called as Well-Known call mode. It is stateless.
2. CAO (Client Activated Objects)
It has state.

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