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]

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_DoubleClick(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.DoubleClick
Dim Other As ModalPopupForm

Other = New ModalPopupForm
Other.DataToBeEdited = 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.ComponentModel.CancelEventArgs) Handles MyBase.Closing
Dim closingForm As ModalPopupForm
closingForm = CType(sender, ModalPopupForm)
updateDataGrid(closingForm.EditedData)
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]

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.datafromGrid = DataFromGrid
frm.showdialog
WhateverIWantfromMyPopupForm = frm.WhateverIWant
frm.dispose

I hope this helps,

Cor

[Job Lot]

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:

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.datafromGrid = DataFromGrid
frm.showdialog
WhateverIWantfromMyPopupForm = frm.WhateverIWant
frm.dispose

I hope this helps,

Cor

[Job Lot]

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:

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_DoubleClick(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.DoubleClick
Dim Other As ModalPopupForm

Other = New ModalPopupForm
Other.DataToBeEdited = 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.ComponentModel.CancelEventArgs) Handles MyBase.Closing
Dim closingForm As ModalPopupForm
closingForm = CType(sender, ModalPopupForm)
updateDataGrid(closingForm.EditedData)
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