I have a simple winform. On the form, I have a DataGrid and a Textbox, along
with a typed (and filled) dataset.

First, I add a databinding to the textbox, binding it to a field in say...
Northwind's Customers table. Then I databind the datagrid by setting the
Datasource property to "dsNorthwind" and the Datamember property to
"Customers". At runtime, when i click a row in the grid, the textbox also
shows the corresponding field from the grid-selected record. No problemo.

But..... (and here's the beef):

If i set the grid's Datamember to <blank> and the Datasource to
"dsNorthwind.Customers", the textbox no longer synchronizes with the
selected row in the grid at runtime.

What gives?? What simple detail am I missing here?

-Jespersen