You create a grid (in our case it was an infragistics grid) and follow the documentation on how to add the Addrow to the top of the grid.

If you view the code and add the event handler as in the tutorials everything will work out.

BUT if you double click on the event to get VS to create the event handler for you and then add the code to create a new entity you will probably get a concurrency error message that the value “123” or whatever the key field is already exists in the database.

The reason for that is that the event default stuff is still firing and adding the record and then the event fires and ‘re-adds’ the information.

I don’t know all the technical jargon to what is happening.  All I know is that when we removed the event from the designer code (or delete it in the event properties window) and then added the event handler in code everything worked fine.