How do I enable DataGridView?
Currently it is greyed out in the toolbox, see this screenshot.
DataGridView is a Windows Forms control, as your screenshot shows. Putting WinForms in WPF is usually avoided where possible as they are different technologies - you should aim to use a WPF equivalent.
If you really want to use it, you can use a WindowsFormsHost - there are lots of guides out there to explain how.
In fact, DataGrid is the WPF equivalent of DataGridView, e.g. WPF DataGrid Vs Windows Forms DataGridView. I'd use DataGrid if I were using WPF.
