bindingsource.endedit fails first time it is called, succeeds otherwise

[BryanBentz]

(I'm using VS 2012 on a Windows 8.1 machine; building an app that talks to MS Access.)

Overview: on my main form I have a datagridview; the user may select a row, and via a menu option bring up a "detail" form that lets the user edit data for a specific record. That form has (among others) two menu items, "Save & Close" and "Cancel & Close".

The bizarre behavior is that the *first time* I bring up the detail form, make changes and do "Save & Close", the changes aren't saved to the underlying database. Every time after that they are, which makes it difficult to figure out how the code might be wrong. My first question: has anyone else seen anything like this behavior?

There is nothing in the detail form's LOAD event that might be to blame.

I used Visual Studio's 'wizards' or whatever they're called to bring in the dataset, and there is a *lot* of autogenerated code; I suspect a bug in there somewhere, but after several readthroughs have found nothing.

The "Save" part, invoked from the menu, (loosely - I'll use "BindSrc" for the binding source name) does:
Me.Validate()
Me.BindSrc.EndEdit()
Me.TableAdapterManager.UpdateAll(Me.Maindataset)

(A variant that just does the Update on the specific table adapter makes no difference.)

The system itself is a bit more complicated, with multiple datagrids on multiple forms, linked together in various ways - not trivial for me to quote the code in detail without being both voluminous and tedious.

I think what's driving me slightly nuts is that the code as written works, without errors, every time after the first use of the form. Consequently I don't think I'm missing some key function or method call; rather, it is a state-based problem, and I have no way to get in to (say) EndEdit to see what state information it might be using.

Any suggestions would be most appreciated.

[HanneSThEGreaT]

I would guess that it might be due to how the object has been initialized; or perhaps even a scoping issue