DOT NET Interview Questions - DotNetSpider

Dataset has “AcceptChanges” method which commits all the changes since last time
“Acceptchanges” has been executed.
Note :- This book does not have any sample of Acceptchanges.I leave that to reader’s as
homework sample.But yes from interview aspect that will be enough.
(B) How can we check that some changes have been made
to dataset since it was loaded ?
Twist :- How can we cancel all changes done in dataset ? , How do we get values which are
changed in a dataset ?
For tracking down changes Dataset has two methods which comes as rescue “GetChanges
“and “HasChanges”.
GetChanges
Return’s dataset which are changed since it was loaded or since Acceptchanges was
executed.
HasChanges
This property indicate’s has any change’s been made since the dataset was loaded or
acceptchanges method was executed.
If we want to revert or abandon all change’s since the dataset was loaded use
“RejectChanges”.
Note:- One of the most misunderstood things about these properties is that it tracks the
changes of actual database.That’s a fundamental mistake , actually the changes are related
to only changes with dataset and has nothing to with changes happening in actual
database.As dataset are disconnected and do not know anything about the changes
happening in actual database.
(B) How can we add/remove row’s in “DataTable” object of
“DataSet” ?
“Datatable” provides “NewRow” method to add new row to “DataTable”.”DataTable”
has “DataRowCollection” object which has all rows in a “DataTable” object.Following
are the methods provided by “DataRowCollection” object :-
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