使用mvvm将数据从2个表绑定到数据网格

I am new in MVVM and WPF world. I've been looking for an answer to this question with no luck. I wanna bind a datagrid using an ObservableCollection which is in my ViewModel class but the data that feeds my ObservableCollection comes from 2 different tables looking something like this:I am new in MVVM and WPF world. I've been looki