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What is the difference between a DataSet and a DataTable in .NET?
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DataSet comprises one or many dataset tables which have the in-memory feature. DataTable holds a single or unit database table that has an in-memory feature. DataSet is formed collectively of datatables. DataTable is composed of multiple rows and columns to have better access to data.
A DataTable is an in-memory representation of a single database table. You can think of it as having columns and rows in the same way. A dataset is an in-memory representation of a database-like structure. It can have one or more DataTables and define relations between them, key or any fields etc.
Data are observations or measurements (unprocessed or processed) represented as text, numbers, or multimedia. A dataset is a structured collection of data generally associated with a unique body of work.
DataTable means single table representation whereas a DataSet is a multiple table representation. That means by using DataTable we can hold only one single table from the database, if we use DataSet we can hold multiple tables at a time... DataView means view of data available in DataSet ...
Basically a DataSet is a collection of DataTables, possibly including relationships between the tables.
From the documentation for DataSet:
The DataSet, which is an in-memory cache of data retrieved from a data source, is a major component of the ADO.NET architecture. The DataSet consists of a collection of DataTable objects that you can relate to each other with DataRelation objects. You can also enforce data integrity in the DataSet by using the UniqueConstraint and ForeignKeyConstraint objects. For further details about working with DataSet objects, see DataSets, DataTables, and DataViews (ADO.NET).
So a DataSet itself doesn't contain the data - that's always within DataTables. The DataSet adds metadata, basically.
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