The CommandBuilder and DataAdapter classes are both part of the ADO.NET framework in .NET, but they serve different purposes.
The CommandBuilder class is used to automatically generate SQL commands for a DataAdapter based on the changes made to a DataSet or DataTable. It provides a convenient way to generate Insert, Update, and Delete commands without having to explicitly write the SQL statements. The CommandBuilder examines the structure of the DataTable and generates the appropriate SQL commands based on that structure. This can simplify the process of updating the database with changes made to the DataTable.
On the other hand, the DataAdapter class acts as a bridge between a data source (such as a database) and a DataSet. It provides methods to retrieve data from the data source and populate a DataSet, as well as update the data source with changes made to the DataSet. The DataAdapter uses command objects (such as SqlCommand, OleDbCommand, etc.) to execute SQL commands and retrieve data. It also provides methods to explicitly define the Select, Insert, Update, and Delete commands for retrieving and updating data.
In summary, the CommandBuilder is used to automatically generate SQL commands for the DataAdapter based on the structure of a DataTable, while the DataAdapter is responsible for retrieving and updating data between a data source and a DataSet, using command objects to execute SQL commands.
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