Datagrids and controls - part 2

[Jo]

Hi,

I've tried the suggested solution but I'm still getting
the same error. It seems that once the page postback is
envoked the checkbox control is removed from the datagrid
so all my changes (ticks etc) are lost. Is there a way of
retaining the checkbox control on a postback?

Thanks,

Jo

***********************
try this

Dim mycheck As CheckBox = CType(dgWelcomePacks.Items
(i).Cells(7).Controls(1), CheckBox)

regards,
Kumar.

-----Original Message-----
Hi,

I'm doing a web application and I have a datagrid that's
linked to a dataset. For one of the columns in the
datagrid I create and add a checkbox control so that userscan easily modify the value in the dataset. I do that in
the following way:

Dim mycheck As New CheckBox()
dgWelcomePacks.Items(i).Cells(7).Controls.Add(myc heck)

I then mark the checkbox as ticked or unticked, depending
on the dataset value in the cell.
That all works fine.
Now when a user has finished with all the data in the
datagrid (ie ticking\unticking the checkboxes on differentrows) I want to be able to update the dataset with the newcheck values. I tried by running through all the rows in
the datagrid and piking up the checkbox control value:

Dim mycheck As CheckBox = CType(dgWelcomePacks.Items
(i).Cells(7).Controls(0), CheckBox)

But that gives me an error saying that there is no controlin that cell (index out of range). How can that be when I
see the checkbox in the cell on the screen? Is there
something that I'm not doing when I'm initially creating
the checkbox and adding it as a control to the cell?

Any help would be greately appreciated.

Thanks in advance,

Jo

.

[Joe Glover]

Hi Jo

Just noticed this follow up to your last post; here's what I said in reply
to that:

The key to making dynamically generated controls maintain their viewstate is
to generate them during the Page_Init event.
This occurs before the viewstate is deserialized, so provided you've created
the objects by this point the framework will do the rest for you. Any later
than this, and you've missed it! The viewstate is lost.

Hope this helps you; if you still can't get it working post some code and
I'll have a look.

Also: if you're using a designer (Visual Studio for example), you may find
it easier to add a template column to your datagrid, and drag a checkbox
into it rather than create it in code. Then all you have to do is populate
your dataset and bind the grid thus:

Protected Overrides Sub OnInit(ByVal e As System.EventArgs)
MyBase.OnInit(e)
Me.OleDbDataAdapter1.Fill(Me.DataSet11)
Me.DataGrid1.DataBind()
End Sub

HTH
Regards
Joe

"Jo" <jo******@cardcall.com.au> wrote in message
news:92****************************@phx.gbl...

Hi,

I've tried the suggested solution but I'm still getting
the same error. It seems that once the page postback is
envoked the checkbox control is removed from the datagrid
so all my changes (ticks etc) are lost. Is there a way of
retaining the checkbox control on a postback?

Thanks,

Jo

***********************
try this

Dim mycheck As CheckBox = CType(dgWelcomePacks.Items
(i).Cells(7).Controls(1), CheckBox)

regards,
Kumar.

-----Original Message-----
Hi,

I'm doing a web application and I have a datagrid that's
linked to a dataset. For one of the columns in the
datagrid I create and add a checkbox control so that

users

can easily modify the value in the dataset. I do that in
the following way:

Dim mycheck As New CheckBox()
dgWelcomePacks.Items(i).Cells(7).Controls.Add(myc heck)

I then mark the checkbox as ticked or unticked, depending
on the dataset value in the cell.
That all works fine.
Now when a user has finished with all the data in the
datagrid (ie ticking\unticking the checkboxes on

different

rows) I want to be able to update the dataset with the

new

check values. I tried by running through all the rows in
the datagrid and piking up the checkbox control value:

Dim mycheck As CheckBox = CType(dgWelcomePacks.Items
(i).Cells(7).Controls(0), CheckBox)

But that gives me an error saying that there is no

control

in that cell (index out of range). How can that be when I
see the checkbox in the cell on the screen? Is there
something that I'm not doing when I'm initially creating
the checkbox and adding it as a control to the cell?

Any help would be greately appreciated.

Thanks in advance,

Jo

.