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Answer Posted / rahul shukla
DataReader
Datareader is like a forward only recordset. It fetches one
row at a time so very less Network Cost compare to
DataSet(Fetches all the rows 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.
Data Set
Data Set is always a bulky object that requires lot of
memory space compare to Data Reader. We can say the data set
as a small database coz it stores the schema and data in the
application memory area. DataSet fetches all data from the
data source at a time to its memory area. So we can traverse
through the object to get required data like qureying database.
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