I am developing an application for pocketpc and this involvs a but of
juggling with different forms.
I have an "order entry" type of application. On the main form I have a
grid which displays Order headers. Let call this form "OrderList"
From this view I edit/enter new orders by opening a new form for
entering data. This is done using (more or less) the designer generated
forms, so I have a "Order edit view dialog. I pass the binding source to
the child form (in constructor). When returning to main form
"OrderList" I update the database (from the orderlist view checking if
dialoresult is ok or cancel). Works fine.
When entering order details I have a form which works much like the
orderList form (let call this OrderDetailList). I have a grid with order
details row. I open the order detail form from "OrderList" passing the
Orderheader binding source to the Order detail form. I enter/edit order
detail rows the same way I do with the order header, ie opening a child
form passing the order detail bindingsource to the edit dialog form.
Note: the Designer has added dataset object (and tableadapters) to the
order detail list.
Now this works fine except for when I try to update the database. I
first had something like this in the OrderDetail form:
OrderDetailTableAdaper.Update(me.OrderDataSet)
which didn't work. I come to the conclusion that it doesn't work because
the DataSet objetc I have in the OrderDetailList is never filled with
data since I have passed the bindingsource from the OrderList form.
Am I correct about this?
Anyway, my next try was to simply using the dataset of the OrderList
from in the update:
OrderDetailTableAdaper.Update(OrderList.OrderDataS et)
Which I don't like because it breaks the encapsulation of the form by
referencing another form.
I then got the idea to "why not pass the datasource of the
bindingsource" like this:
OrderDetailTableAdaper.Update(OrderHdrBindingSourc e.datasource)
but that doesn't work, get some error message about latebound overload
resolution not supported.
How can I do this ?
My own solution which is actually better than saving in the orderlist
view is to do the update when I return to OrderList form. Then I have
all the database updates in one location. But I still want to know how I
could do this in the order detail list without having to reference the
calling form.
I guess one method is maybe to get the the modified rows and pass that
to the update method. But still interestign to knwo if I can reference
the datasource objetc id directly in some way.
