Difference between Dataset and DataReader

There is difference  between DataReader and DataSet Is List Out Here

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A DataReader works in a connected environment, where as DataSet works in a disconnected environment. 

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A DataReader object represents a forward only, read only access to data from a source. It implements IDataReader & IDataRecord interfaces. For example, The SQLDataReader class can read rows from tables in a SQL Server data source. It is returned by the ExecuteReader method of the SQLCommand class, typically as a result of a SQL Select statement. The DataReader class' HasRows property can be called to determine whether the DataReader retrieved any rows from the source. This can be used before using the Read method to check whether any data has been retrieved. 

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A DataSet represents an in-memory cache of data consisting of any number of inter-related DataTable objects. A DataTable object represents a tabular block of in-memory data. Further, a DataRow represents a single row of a DataTable object. A Dataset is like a mini-database engine, but its data is stored in the memory. To query the data in a DataSet, we can use a DataView object.

DataSet object	DataReader object
Read/Write access	Read-only access
Supports multiple tables from different databases	Supports a single table based on a single SQL query of one database
Disconnected mode	Connected mode
Bind to multiple controls	Bind to a single control
Forward and backward scanning of data	Forward-only scanning of data
Slower access to data	Faster access to data
Greater overhead to enable additional features	Lightweight object with very little overhead
Supported by Visual Studio .NET tools	Must be manually coded