Question

entity framework plays a role as ORM in between the underlying datasource and UI controls, i’m wondering do we still need to use bindingsource on top of EF?

e.g.
can i just bind

datagridview.DataSource = entity.getdata();

instead of

bindingsource.DataSource = entity.etdata();
this.datagridview.DataSource = this.bindingsource;

Answer 1

Obviously you can directly bind the datasource of the Gridview to the entity result.
But what about following scenarios:

1. Having multiple controls attaching to the same datasource, e.g. List+Detail
2. Navigating in code-behind through the datasource.
   Can be done using “ugly” CurrencyManager but is much nicer through the bindingsource

More here bindingsource “Remarks” section in MSDN