Jeff,

>I have a mmDataGridView with AllowUserToAddRow = True. It is bound to InvoicesItems which is a child of the primary table Invoices.
>
>When I open the form, the Invoices business object is populated. No changes are made to the InvoicesItems business Object. I close the form and I get an error: There is no row at position 0
>
>When I follow the error, I end up in mmBusinessForm.EndEdit(). When it calls EndEdit() on the individual rows for InvoicesItems, it gets a Position = 0 from this.BindingContext[...].Position, but there is are no rows in the table. When it calls dt.Rows[0].EndEdit() it throws an error because there is no row at position 0.
>
>It looks like the Grid is reporting its position at row 0 because that is where the cursor is and data will be entered. But, since data has not been entered, no row has been created.

Ouch...the BindingContext manager shouldn't be reporting back position 0 in this case. It should be reporting -1. I haven't seen this happen before...is there anything unusual about this form?

We can add code to EndEdit() that checks if there are any rows before calling EndEdit()...even though we shouldn't have to.

Best Regards,