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Data Sets only hold data and do not interact with a data source.
It is the Sql Data Adapter that manages connections with the data source and gives us disconnected behavior.
Bind variables are placeholders inside a SQL statement.
When a database receives a SQL statement, it determines if the statement has already been executed and stored in memory.
Using bind variables also improves query performance in the database, eliminates the need for special handling of literal quotation marks in the input, and protects against SQL injection attacks.The following code shows a typical contains a client copy of the database data.In Lesson 3, we discussed a fully connected mode of operation for interacting with a data source by using the Sql Command object.In Lesson 4, we learned about how to read data quickly an let go of the connection with the Sql Data Reader.
This Lesson shows how to accomplish something in-between Sql Connection and Sql Data Reader interaction by using the Data Set and Sql Data Adapter objects.A Data Set is an in-memory data store that can hold numerous tables.