Passing data between forms?

[Job Lot]

How would I send information from DataGrid on the main form of the
application to a modal popup form and then pass any changes to the data back
to the main form and database when the popup form was closed?

Thanks

[Tor BÃ¥dshaug]

RE: Passing data between forms?

Assuming that you know how to read the data in question from the datagrid and
update it, you can:

1)from the event handler that you want to use to fire the modal popup form,
ensure that the required data is passed:

Private Sub MainForm_Double Click(ByVal sender As Object, ByVal e As
System.EventArg s) Handles MyBase.DoubleCl ick
Dim Other As ModalPopupForm

Other = New ModalPopupForm
Other.DataToBeE dited = dataToBeEdited '
Other.Show()
End Sub

2)In the desired event in the modal popup, ensure that updated data is
propagated back into the datagrid. Since it is a modal popup, I suggest

Private Sub ModalPopupForm_ Closing(ByVal sender As Object, ByVal e As
System.Componen tModel.CancelEv entArgs) Handles MyBase.Closing
Dim closingForm As ModalPopupForm
closingForm = CType(sender, ModalPopupForm)
updateDataGrid( closingForm.Edi tedData)
End Sub

To finish this, you must implement the ModalPopupForm' s DataToBeEdited and
EditedData properties, as well as the updateDataGrid-method.
Alternatively, you can pass the datagrid itself as the
'DataToBeEdited '-property. In this case you can drop implementing
updateDataGrid at all, but this latter approach creates an extremely tight
coupling between MainForm and ModalPopupForm which is generally not desirable.

Tor BÃ¥dshaug
tor.badshaug(AT )bekk.no

[Cor Ligthert]

Re: Passing data between forms?

Job,

When you ask this kind of question in this newsgroup, tell than next time if
you use C# or VBNet. Althoug a language newsgroup is in my opinion more
proper. It can in VBNet be something as

Dim frm as myPopupForm
frm.datafromGri d = DataFromGrid
frm.showdialog
WhateverIWantfr omMyPopupForm = frm.WhateverIWa nt
frm.dispose

I hope this helps,

Cor

[Job Lot]

Re: Passing data between forms?

someone suggested me this which seems quite straight forward

I would use the method of showing the add/edit window(s) as dialog forms
from the main form. This will allow you to instantiate the add/edit window
from the same form as your datagrid/datasource. You can then get the current
row from the datasource and use it as the datasource for databinding to
controls on the add/edit form. After the user is finished with the add/edit
form and they click ok, you can call update on your dataadapter(s). This
method makes it easy because you can do everything from a single routine. You
don't really need to pass a lot of references between forms; just set and
read the property values of the controls on the add/edit form.


"Cor Ligthert" wrote:
[color=blue]
> Job,
>
> When you ask this kind of question in this newsgroup, tell than next time if
> you use C# or VBNet. Althoug a language newsgroup is in my opinion more
> proper. It can in VBNet be something as
>
> Dim frm as myPopupForm
> frm.datafromGri d = DataFromGrid
> frm.showdialog
> WhateverIWantfr omMyPopupForm = frm.WhateverIWa nt
> frm.dispose
>
> I hope this helps,
>
> Cor
>
>
>[/color]

[Job Lot]

RE: Passing data between forms?

someone suggested me this which seems quite straight forward

I would use the method of showing the add/edit window(s) as dialog forms
from the main form. This will allow you to instantiate the add/edit window
from the same form as your datagrid/datasource. You can then get the current
row from the datasource and use it as the datasource for databinding to
controls on the add/edit form. After the user is finished with the add/edit
form and they click ok, you can call update on your dataadapter(s). This
method makes it easy because you can do everything from a single routine. You
don't really need to pass a lot of references between forms; just set and
read the property values of the controls on the add/edit form.


"Tor BÃ¥dshaug" wrote:
[color=blue]
> Assuming that you know how to read the data in question from the datagrid and
> update it, you can:
>
> 1)from the event handler that you want to use to fire the modal popup form,
> ensure that the required data is passed:
>
> Private Sub MainForm_Double Click(ByVal sender As Object, ByVal e As
> System.EventArg s) Handles MyBase.DoubleCl ick
> Dim Other As ModalPopupForm
>
> Other = New ModalPopupForm
> Other.DataToBeE dited = dataToBeEdited '
> Other.Show()
> End Sub
>
> 2)In the desired event in the modal popup, ensure that updated data is
> propagated back into the datagrid. Since it is a modal popup, I suggest
>
> Private Sub ModalPopupForm_ Closing(ByVal sender As Object, ByVal e As
> System.Componen tModel.CancelEv entArgs) Handles MyBase.Closing
> Dim closingForm As ModalPopupForm
> closingForm = CType(sender, ModalPopupForm)
> updateDataGrid( closingForm.Edi tedData)
> End Sub
>
> To finish this, you must implement the ModalPopupForm' s DataToBeEdited and
> EditedData properties, as well as the updateDataGrid-method.
> Alternatively, you can pass the datagrid itself as the
> 'DataToBeEdited '-property. In this case you can drop implementing
> updateDataGrid at all, but this latter approach creates an extremely tight
> coupling between MainForm and ModalPopupForm which is generally not desirable.
>
> Tor BÃ¥dshaug
> tor.badshaug(AT )bekk.no[/color]