Tutorial how to insert and update easily directly in DataGrid WPF

Question

I'm using WPF C# and Entity Framework

I want to insert,delete,update directly in DataGrid in wpf project without anything else , just using DataGrid and KeyDown Event

So when insert or updating data in the cell after users press enter button or Tab button check the conditions for duplication next do it Save

Like this:

https://i.stack.imgur.com/SEDZy.gif 

 

Please help me