Answer Posted / umamahadevan

DataSet

Data set can be said as a temporary data base which works
on disconnected architecture which stores schema and data
in application memory area..It fetches all data at a time..
DML is entertained here

DataReader

Datareader is like a forward only recordset. It fetches one
row at a time.DataReader is readonly so we cannot do any
transaction on them. DataReader will be the best choice
where we need to show the data to the user which requires
no transaction ie reports. Due to DataReader is forward
only we cannot fetch the data randomly. .NET Dataproviders
optimizes the datareaders to handle the huge amount of data.

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