Data Set Data voilation

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C#

ASP.NET

ADO

ADO.NET

I want to know whole working of datasets, how they maintain data. Because if we work with dataset .Then we works in disconnect mode suppose that we pick some data in data set and get disconnected from db. and made some calculateion based upon disconnect data and perform save opration.But in between some body changed that data then our calculation would be worng but it doesn't happen . So how handle Dataset this situation.

Plz explain or give some link for whole working of dataset

Thanks in Advance.........