ASP. NET use ADO. Net to access the data source

ASP. NET uses ADO. Net to access the data source, and the data obtained from accessing the data source is kept in dataset. ADO. NET provides access to multiple data sources and returns the same dataset, which shields the differences between data sources, making ASP. NETProgramYou do not need to modify the program when the data source changes. You only need to modify the data access component.
Dataset is the main component in the ADO. net structure. It is the cache of data retrieved from the data source by ADO. net in the memory. Dataset consists of a group of able objects that can be associated with datarelation objects. Dataset is a memory-resident representation of data. It provides consistent relational programming models regardless of the data source. It can be used for multiple different data sources, for XML data, or for managing local data of applications. Dataset indicates the entire dataset, including related tables, constraints, and relationships between tables.