DataTable:
1.Meaning: A DataTable is an in-memory representation of a single database table which has collection of rows and columns
2.Number of rows retrieved at a time:DataTable fetches only one TableRow at a time
3.Provision of DataRelation Objects:As DataTable is a single database table, so there is no DataRelation object in it.
4.Enforcing Data Integrity:In DataTable, there is no UniqueConstraint and ForeignKeyConstraint objects available.
5.DataSource can be Serialized or Not:In DataTable, DataSource cannot be serialized.
6.To know the example for DataTable, please try the URL: http://www.dotnetperls.com/datatable
DataSet:
1.Meaning:A DataSet is an in-memory representation of a database-like structure which has collection of DataTables.
2.Number of rows retrieved at a time:DataSet can fetch multiple TableRows at a time
3.Provision of DataRelation Objects: In DataSet, DataTable objects can be related to each other with DataRelation objects.
4.Enforcing Data Integrity:In DataSet, data integrity is enforced by using the UniqueConstraint and ForeignKeyConstraint objects.
5.DataSource can be Serialized or Not:DataSet is serialized DataSource .That is why web services can always returns DataSet as the result but not the DataTables.
6.To know the example for DataSet, please try the URL: http://www.dotnetperls.com/dataset