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Hello. I'm creating a page to edit a person's record (name address, etc)
using a DataGrid. I want the fields that can be edited to be created at
runtime based on a list of columns in web.config. This is working fine,
and I can add a control (TextBox or DropDownList) dynamically for the
user to fill in a value. This works well for just adding controls for
data entry.

Now, I want to add validators on the fly as well and it not going quite
as smoothly. I'm suing the following excerpt in the ItemDataBound event
for this DataGrid:

Dim tb As New TextBox, vld As New RequiredFieldValidator

tb.Text = Convert.ToString(e.Item.DataItem("val"))
editCell.Controls.Add(tb)
If e.Item.DataItem("req") Then
vld.ControlToValidate = FindControl(tb.ID.ToString)
vld.ErrorMessage = "Required Field!"
editCell.Controls.Add(vld)
End If

IntelliSense is flagging the FindControl part saying:

"System.Web.UI.Control" cannot be converted to string

Is this a reasonabler approach that I just need to fix the syntax of, or
am I taking the wrong approach? Any suggestions? Thanks!

Matt

Just to vld.ControlToValidated = tb.ID no need to do a FindControl on it,
you already found it it's tb...you created it...

You might need to use ClientId or UniqueId instead of just ID...not 100%
sure...but just a heads up...

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/


"MattB" <> wrote in message
news:...
> Hello. I'm creating a page to edit a person's record (name address, etc)
> using a DataGrid. I want the fields that can be edited to be created at
> runtime based on a list of columns in web.config. This is working fine,
> and I can add a control (TextBox or DropDownList) dynamically for the
> user to fill in a value. This works well for just adding controls for
> data entry.
>
> Now, I want to add validators on the fly as well and it not going quite
> as smoothly. I'm suing the following excerpt in the ItemDataBound event
> for this DataGrid:
>
> Dim tb As New TextBox, vld As New RequiredFieldValidator
>
> tb.Text = Convert.ToString(e.Item.DataItem("val"))
> editCell.Controls.Add(tb)
> If e.Item.DataItem("req") Then
> vld.ControlToValidate = FindControl(tb.ID.ToString)
> vld.ErrorMessage = "Required Field!"
> editCell.Controls.Add(vld)
> End If
>
> IntelliSense is flagging the FindControl part saying:
>
> "System.Web.UI.Control" cannot be converted to string
>
> Is this a reasonabler approach that I just need to fix the syntax of, or
> am I taking the wrong approach? Any suggestions? Thanks!
>
> Matt

Karl Seguin wrote:
> Just to vld.ControlToValidated = tb.ID no need to do a FindControl on it,
> you already found it it's tb...you created it...
>
> You might need to use ClientId or UniqueId instead of just ID...not 100%
> sure...but just a heads up...
>
> Karl
>

Thanks for the reply, but I was trying FindControl because tb.ID didn't
work (Intellisense said it was ok, but it failed at runtime).

So here's the runtime errors I get for each of those suggestions:

tb.ID:
The ControlToValidate property of '' cannot be blank.

tb.UniqueID:
Unable to find control id 'dgGuest:_ctl2:_ctl0' referenced by the
'ControlToValidate' property of ''.

tb.ClientID:
Unable to find control id 'dgGuest__ctl2__ctl0' referenced by the
'ControlToValidate' property of ''.

So could it be that in adding a second control to the same cell I'm
somehow overwriting the tb control? Any other ideas?

THANKS!

Matt

You can simply use ID if you give the tb an id before adding it to the cell

dim tb as new TextBox
tb.ID = "txt"


Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/


"MattB" <> wrote in message
news:...
> Karl Seguin wrote:
> > Just to vld.ControlToValidated = tb.ID no need to do a FindControl on
it,
> > you already found it it's tb...you created it...
> >
> > You might need to use ClientId or UniqueId instead of just ID...not 100%
> > sure...but just a heads up...
> >
> > Karl
> >
>
> Thanks for the reply, but I was trying FindControl because tb.ID didn't
> work (Intellisense said it was ok, but it failed at runtime).
>
> So here's the runtime errors I get for each of those suggestions:
>
> tb.ID:
> The ControlToValidate property of '' cannot be blank.
>
> tb.UniqueID:
> Unable to find control id 'dgGuest:_ctl2:_ctl0' referenced by the
> 'ControlToValidate' property of ''.
>
> tb.ClientID:
> Unable to find control id 'dgGuest__ctl2__ctl0' referenced by the
> 'ControlToValidate' property of ''.
>
> So could it be that in adding a second control to the same cell I'm
> somehow overwriting the tb control? Any other ideas?
>
> THANKS!
>
> Matt

Karl Seguin wrote:
> You can simply use ID if you give the tb an id before adding it to the cell
>
> dim tb as new TextBox
> tb.ID = "txt"
>
>
> Karl
>

Cool. I actually just stumbled on that myself. Thanks again!

Matt