Answer Posted / sanchit yadav

Because it inherites the IEnumerable.IEnumarble contains
the method(getenumerator) its type is IEnumerator it
returns the instance of IEnumerator that implements in a
class that contains three methods current(),movenext(),
reset().Ist call the current() than movenext() move first
tuple to last tuple in the table than call reset() than
cursor moves on the current().So,DataReader works in
forward only and Read only manner.

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