WPF datagrid empty row at bottom

Sounds like you probably have CanUserAddRows set to true for the DataGrid. Just add

CanUserAddRows="false"

to the XAML.

It also works with the attribute:

IsReadOnly="true"

If your backing collection that implements IEditableCollectionView returns true from its CanAddNew method, the DataGrid will assume that is what you want to do.

There's a good overview here:Overview of the editing features in the WPF DataGrid