Question

what is the easiest way to find out those data which has been changed in dataset. i need point out programatically those data which has been modified.

Answer 1

DataSet changes = ds.GetChanges(); 

This will return a dataset with all the changes since the last time Accept or reject was called on the dataset.

You can also apply rowstatefilters i.e. if you want to see only those rows that have been modified:

DataSet changes = ds.GetChanges(DataRowState.Modified);

Or Added:

DataSet changes = ds.GetChanges(DataRowState.Added);