DataSource: Allow data binding on Win Form Controls.
Types of DataSource:
1) Database 2) Service3) Object.
Database :Lets you connect to a database and choose the database objects for your application. This option creates a dataset.
Service:Opens the Add Service Reference dialog box that lets you create a connection to a service that returns the data for your application.
Object:Lets you choose an object that can later be used to generate data-bound controls.