detecting changes in a datagridview

[cj]

As your probably aware the datagridview doesn't update it's source
datatable with changes to a cell until you move off that cell. Suppose
somone makes a change in a cell of my datagridview then clicks to go
elsewhere in the program--how can I be assured that change is
transmitted back to the source datatable?

[Jack Jackson]

Re: detecting changes in a datagridview

On Wed, 05 Dec 2007 16:12:03 -0500, cj <cj@nospam.nosp amwrote:

>As your probably aware the datagridview doesn't update it's source
>datatable with changes to a cell until you move off that cell. Suppose
>somone makes a change in a cell of my datagridview then clicks to go
>elsewhere in the program--how can I be assured that change is
>transmitted back to the source datatable?

One possibility is to force the changes to be made immediately,
although that won't work usefully if you have validation on the cell.

There is a lot of info about DataGridView here:
<http://www.windowsclie nt.net/Samples/Go%20To%20Marke t/DataGridView/DataGridView%20 FAQ.doc>

Section 3.2 describes the process for a checkbox column, and there is
a code snippet here
<http://207.46.236.188/MSDN/ShowPost.aspx?P ostID=2105950&S iteID=1>

Googling for CurrentCellDirt yStateChanged has a number of hits, many
of which are not working at the moment but they may work later.

There is also some information here:
<http://www.msdner.com/dev-archive/106/2-7-1062147.shtm>

[Cor Ligthert[MVP]]

Re: detecting changes in a datagridview

cj,

Call the EndEdit on the datasource.

Cor

As your probably aware the datagridview doesn't update it's source
datatable with changes to a cell until you move off that cell. Suppose
somone makes a change in a cell of my datagridview then clicks to go
elsewhere in the program--how can I be assured that change is
transmitted back to the source datatable?

[Linda Liu[MSFT]]

RE: detecting changes in a datagridview

Hi Chris,

When we select and type in the current cell in a DataGridView, the editing
control attached to the current cell is shown and the current cell is in
edit mode. If you click on another form in the application, only one event
is fired, i.e. the current editing control's LostFocus event.

So we could subscribe this event to get notified when the user clicks to go
elsewhere in the application so as to apply the changes in the current cell
back to the underlying data source.

The following is a sample to do this:

Private Sub DataGridView1_C ellValidated(By Val sender As Object, ByVal e As
System.Windows. Forms.DataGridV iewCellEventArg s) Handles
DataGridView1.C ellValidated
If (Me.DataGridVie w1.EditingContr ol IsNot Nothing) Then
RemoveHandler DataGridView1.E ditingControl.L ostFocus, AddressOf
Control_LostFoc us
End If
End Sub

Private Sub DataGridView1_E ditingControlSh owing(ByVal sender As Object,
ByVal e As System.Windows. Forms.DataGridV iewEditingContr olShowingEventA rgs)
Handles DataGridView1.E ditingControlSh owing
AddHandler e.Control.LostF ocus, AddressOf Control_LostFoc us
End Sub

Sub Control_LostFoc us(ByVal sender As Object, ByVal e As EventArgs)
If (Me.DataGridVie w1.IsCurrentCel lInEditMode) Then
RemoveHandler Me.DataGridView 1.EditingContro l.LostFocus,
AddressOf Control_LostFoc us
Me.DataGridView 1.EndEdit()
End If
End Sub

Hope this helps.
If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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[cj]

Re: detecting changes in a datagridview

Thanks, but right now all that is information overload. Folks here are
aware you can build a UI in 10 minutes. What they don't understand is
what another user put so clearly on another forum "10 minutes to put a
UI on a database table, 3 hours messing around trying to get it to work
correctly." I don't have time to read all that. Thankfully my
tinkering and these questions is helping.

Jack Jackson wrote:

On Wed, 05 Dec 2007 16:12:03 -0500, cj <cj@nospam.nosp amwrote:
>

>As your probably aware the datagridview doesn't update it's source
>datatable with changes to a cell until you move off that cell. Suppose
>somone makes a change in a cell of my datagridview then clicks to go
>elsewhere in the program--how can I be assured that change is
>transmitted back to the source datatable?

>
One possibility is to force the changes to be made immediately,
although that won't work usefully if you have validation on the cell.
>
There is a lot of info about DataGridView here:
<http://www.windowsclie nt.net/Samples/Go%20To%20Marke t/DataGridView/DataGridView%20 FAQ.doc>
>
Section 3.2 describes the process for a checkbox column, and there is
a code snippet here
<http://207.46.236.188/MSDN/ShowPost.aspx?P ostID=2105950&S iteID=1>
>
Googling for CurrentCellDirt yStateChanged has a number of hits, many
of which are not working at the moment but they may work later.
>
There is also some information here:
<http://www.msdner.com/dev-archive/106/2-7-1062147.shtm>

[cj]

Re: detecting changes in a datagridview

Yes, I find that does work but due to other situations in the code it
wasn't immediately apparent. I think with some rearranging it will do.

Cor Ligthert[MVP] wrote:

cj,
>
Call the EndEdit on the datasource.
>
Cor
>

>As your probably aware the datagridview doesn't update it's source
>datatable with changes to a cell until you move off that cell.
>Suppose somone makes a change in a cell of my datagridview then clicks
>to go elsewhere in the program--how can I be assured that change is
>transmitted back to the source datatable?

[cj]

Re: detecting changes in a datagridview

Linda, sorry this pretty much goes over my head. Cor and some playing
around on my part have been able to make this a non-issue now. Thanks
anyway.

Linda Liu[MSFT] wrote:

Hi Chris,
>
When we select and type in the current cell in a DataGridView, the editing
control attached to the current cell is shown and the current cell is in
edit mode. If you click on another form in the application, only one event
is fired, i.e. the current editing control's LostFocus event.
>
So we could subscribe this event to get notified when the user clicks to go
elsewhere in the application so as to apply the changes in the current cell
back to the underlying data source.
>
The following is a sample to do this:
>
Private Sub DataGridView1_C ellValidated(By Val sender As Object, ByVal e As
System.Windows. Forms.DataGridV iewCellEventArg s) Handles
DataGridView1.C ellValidated
If (Me.DataGridVie w1.EditingContr ol IsNot Nothing) Then
RemoveHandler DataGridView1.E ditingControl.L ostFocus, AddressOf
Control_LostFoc us
End If
End Sub
>
Private Sub DataGridView1_E ditingControlSh owing(ByVal sender As Object,
ByVal e As System.Windows. Forms.DataGridV iewEditingContr olShowingEventA rgs)
Handles DataGridView1.E ditingControlSh owing
AddHandler e.Control.LostF ocus, AddressOf Control_LostFoc us
End Sub
>
Sub Control_LostFoc us(ByVal sender As Object, ByVal e As EventArgs)
If (Me.DataGridVie w1.IsCurrentCel lInEditMode) Then
RemoveHandler Me.DataGridView 1.EditingContro l.LostFocus,
AddressOf Control_LostFoc us
Me.DataGridView 1.EndEdit()
End If
End Sub
>
Hope this helps.
If you have any question, please feel free to let me know.
>
Sincerely,
Linda Liu
Microsoft Online Community Support
>
=============== =============== =============== =====
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscripti...ult.aspx#notif
ications.
>
Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at
http://msdn.microsoft.com/subscripti...t/default.aspx.
=============== =============== =============== =====
>
This posting is provided "AS IS" with no warranties, and confers no rights.
>

[Cor Ligthert[MVP]]

Re: detecting changes in a datagridview

Linda,

AFAIK does the push of a button not fire the lostfocus event. Armin can much
better tell this then me, however this has been forever with Microsoft
controls.

Cor