Hi Tobias,

The ListObject returns the object in the data source that represents the data item. The problem with the code you have here is that it is assuming that the object is always a DataRowView. That will only be true if you are using a DataSet / DataTable as your DataSource. If you are using a List<T> or a BindingList<T>, then you can't cast that into a DataRowView, because it's not a DataRowView, it's a T.

So if your data source is: BindingList<Person>

Then your code to get the typed ListObject would be:

var drv = (Person)e.Row.ListObject;

My problem exactly, sample code fails on following line:

            var drv = (DataRowView)e.Row.ListObject;

Have you solved this? And how?

If the grid  data source is bound to a  business entity, ie BindingList<Person>, then wouldn't e.Row.ListObject simply return an entity instance of Person?

I was a little worried about looping through the grid, but performance seems fine. Below is the code I used in case others are looking for a similar solution. As you can see, I stopped on just the row.  

          if ((int)c.CustomerID > errCustomerID) //make sure you're past the previous error

              {      errCustomerID = (int)c.CustomerID;